new observations and a review of killer whale ( orcinus ... · aquatic mammals2003,29.1,150–172...

23
Aquatic Mammals 2003, 29.1, 150–172 New observations and a review of killer whale (Orcinus orca) sightings in Papua New Guinea waters Ingrid N. Visser 1 and Frank J. Bonoccorso 2 1 Orca Research Trust, P.O. Box 1233, Whangarei, New Zealand 2 National Museum & Art Gallery, P.O. Box 5560, Boroko, NCD, Papua New Guinea Abstract Although typically considered a temperate to cold water species, killer whales (or orca) (Orcinus orca) have been reported intermittently in tropical waters. While the IUCN (IUCN, 2000) does not list the species as present in Papua New Guinea waters, the records presented here indicate it is found in the area for at least 10 months of the year. A total of 94 sightings of killer whales in Papua New Guinea waters were complied. Thirty-seven sight- ings from April 1987 to July 2002 were recorded with an exact date and location, with a further 57 sightings of unknown date or exact location. Twenty-seven of all records had either photographs or videotape to con rm species identi cation. The earliest reference to killer whales in this region was from 1956, when they were recorded taking sh oV long-lines. Killer whales from Papua New Guinea waters have been observed feeding on four species of elasmobranchs (scalloped-hammerhead shark, Sphyrna lewini; grey reef shark, Carcharhinus amblyrhynchos ; manta ray, Manta birostris; and blue-spotted ray Dasyatis kuhlii) and four species of n- sh (yellow- n tuna, Thunnus albacares ; big- eye tuna, Thunnus obesus ; Indo-Paci c sail sh, Istiophorus platypterus; and sun sh, Mola mola). These are the rst records, worldwide, of killer whales feeding on scalloped-hammerhead sharks, grey reef sharks and blue-spotted rays. Killer whales in these waters have been reported in associ- ation with two species of cetaceans (sperm whales, Physeter macrocephalus and spinner dolphins, Stenella longirostris ). Photo-identi cation images were collected for 14 individuals and a catalogue established. Matches were made for two animals—a female sighted approximately 30 n mi and two days apart and a sub-adult male sighted in the same region 16 months apart. Some individual killer whales from these waters have been observed with grey under- ukes, in contrast to white, which is typically described for this species. Key words: Killer whale, Orcinus orca, Papua New Guinea, photo-identi cation, foraging, elasmo- branches, n- sh. Introduction The status of Papua New Guinea cetaceans is largely unknown. The only systematic study of species, or individuals within a species, was con- ducted in 2001, targeting sperm whales (Physeter macrocephalus ) (Bonoccorso, unpublished data). Munday (1994) compiled anecdotal information on cetaceans in the Kimbe Bay area (New Britain Island, Papua New Guinea) for a ‘Rapid Ecological Assessment’ and noted that Orcinus orca had been observed. However, only approximate timings of sightings by month or year were given, and only general locations were stated. In addition, although killer whales were listed as ‘uncommon’, no quan- ti cation was given for this classi cation (Munday, 1994). Although the IUCN Red Data List (IUCN, 2000) does not list killer whales as present in Papua New Guinean waters, they are known to occur intermittently in the area (Cousteau & Richards, 1989; Munday, 1994). Therefore, following Aragones et al. (1997), who suggest an order of procedures for cetacean research in developing countries (i.e., interviews followed by actual surveys), a preliminary Kimbe Bay Cetacean Research Project was instigated in April 2002. Over a 13-day period, six species were recorded, including killer whales (Visser, 2002a). Details from that survey, along with other records of the species in Papua New Guinea waters are presented here. Materials and Methods Records and anecdotal sightings For this paper, scienti c manuscripts, newspapers, dive magazines, books, unpublished newsletters, the ? 2003 EAAM

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Page 1: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

Aquatic Mammals 2003 291 150ndash172

New observations and a review of killer whale (Orcinus orca)sightings in Papua New Guinea waters

Ingrid N Visser1 and Frank J Bonoccorso2

1Orca Research Trust PO Box 1233 Whangarei New Zealand2National Museum amp Art Gallery PO Box 5560 Boroko NCD Papua New Guinea

Abstract

Although typically considered a temperate to coldwater species killer whales (or orca) (Orcinus orca)have been reported intermittently in tropical watersWhile the IUCN (IUCN 2000) does not list thespecies as present in Papua New Guinea watersthe records presented here indicate it is found inthe area for at least 10 months of the year A totalof 94 sightings of killer whales in Papua NewGuinea waters were complied Thirty-seven sight-ings from April 1987 to July 2002 were recordedwith an exact date and location with a further 57sightings of unknown date or exact locationTwenty-seven of all records had either photographsor videotape to con rm species identi cation Theearliest reference to killer whales in this region wasfrom 1956 when they were recorded taking sh oVlong-lines Killer whales from Papua New Guineawaters have been observed feeding on four speciesof elasmobranchs (scalloped-hammerhead sharkSphyrna lewini grey reef shark Carcharhinusamblyrhynchos manta ray Manta birostris andblue-spotted ray Dasyatis kuhlii) and four speciesof n- sh (yellow- n tuna Thunnus albacares big-eye tuna Thunnus obesus Indo-Paci c sail shIstiophorus platypterus and sun sh Mola mola)These are the rst records worldwide of killerwhales feeding on scalloped-hammerhead sharksgrey reef sharks and blue-spotted rays Killerwhales in these waters have been reported in associ-ation with two species of cetaceans (sperm whalesPhyseter macrocephalus and spinner dolphinsStenella longirostris) Photo-identication imageswere collected for 14 individuals and a catalogueestablished Matches were made for two animalsmdashafemale sighted approximately 30 n mi and two daysapart and a sub-adult male sighted in the sameregion 16 months apart Some individual killerwhales from these waters have been observed withgrey under-ukes in contrast to white which istypically described for this species

Key words Killer whale Orcinus orca Papua NewGuinea photo-identication foraging elasmo-branches n- sh

Introduction

The status of Papua New Guinea cetaceans islargely unknown The only systematic study ofspecies or individuals within a species was con-ducted in 2001 targeting sperm whales (Physetermacrocephalus) (Bonoccorso unpublished data)Munday (1994) compiled anecdotal information oncetaceans in the Kimbe Bay area (New BritainIsland Papua New Guinea) for a lsquoRapid EcologicalAssessmentrsquo and noted that Orcinus orca had beenobserved However only approximate timings ofsightings by month or year were given and onlygeneral locations were stated In addition althoughkiller whales were listed as lsquouncommonrsquo no quan-ti cation was given for this classi cation (Munday1994) Although the IUCN Red Data List (IUCN2000) does not list killer whales as present in PapuaNew Guinean waters they are known to occurintermittently in the area (Cousteau amp Richards1989 Munday 1994)

Therefore following Aragones et al (1997) whosuggest an order of procedures for cetaceanresearch in developing countries (ie interviewsfollowed by actual surveys) a preliminary KimbeBay Cetacean Research Project was instigated inApril 2002 Over a 13-day period six species wererecorded including killer whales (Visser 2002a)Details from that survey along with other recordsof the species in Papua New Guinea waters arepresented here

Materials and Methods

Records and anecdotal sightingsFor this paper scienti c manuscripts newspapersdive magazines books unpublished newsletters the

2003 EAAM

lsquoInternetrsquo anecdotal sightings and unpublisheddata were sourced for details of killer whale sight-ings Records were divided into two types lsquocom-pletersquo and lsquodata-decientrsquo For lsquocompletersquo recordsan exact date and an exact location was known(Table 1 Figure 1) whereas for lsquodata-de cientrsquorecords only a month or year was known or nodate at all and an exact location may not have beenknown Because uncertainty in dates could result inconfusion or replication of sightings without dateslsquodata-decientrsquo records were listed in a separatetable (Table 2 Figure 2)

Although species identi cation may be uncertainwhen suggested by non-specialists killer whales areconsidered one of the easiest species of marinemammal to identify at sea based on their sizepostocular white patch and the large dorsal ns on males (Heyning amp Dahlheim 1988) Inaddition many observations recorded here wereaccompanied by photographs or videotape or theobserver had multiple encounters with the specieseg M Benjamin and T Peluso (Table 1)

Photo-identi cationPhoto-identication uses photographs to recordindividual congenital andor acquired identi cationmarks (Hammond et al 1990) For killer whalesevery individual can be uniquely identi ed fromhigh-quality photographs (Baird 2000) The dorsal n is the main feature photographed because it isexposed above water most often (Bigg 1982) Somekiller whale research projects use photographs ofonly one side of the dorsal n eg in the Paci cNorth West (Ford amp Ellis 1999 Ford et al 1994)and Norway (T Similauml pers comm) Howeverwherever possible during this study both sides ofthe killer whales were photographed as pigmenta-tion patterns can diVer considerably on each side ofan animal (Leatherwood et al 1984 Visser ampMaumlkelaumlinen 2000) and a record of both sidescould improve the chances of subsequent matchesMoreover this allows photographs from the public(which may be taken of either side of an animal) tobe matched (Visser amp Maumlkelaumlinen 2000)

Killer whales can also be photo-identied by theirdistinctive saddle patches (Baird amp Stacey 1988Bigg 1982) eye patches (Visser amp Maumlkelaumlinen2000) pigmentation patterns on the underside ofthe tail (Visser 2000b) malformations (Berghan ampVisser 2000) scars from propellers (Visser 1999bVisser amp Fertl 2000) and other scars such as teethrake marks (Baird 2000 Visser 1998) Thereforephotographs (including underwater images) andvideotape illustrating any unique features werecollected

To catalogue the killer whales each animal wasassigned a unique consecutive number preceded bythe letters PNG signifying that it was identi ed in

Papua New Guinea waters ie PNG1 PNG2PNG3 etc This catalogue was compared to thenearest geographic population of killer whales forwhich an identi cation catalogue is held ie NewZealand

Agesex classi cationPhoto-identied killer whales were grouped byage and sex following Bigg (1982) and Bigget al (1990) These groupings were lsquoadult malersquolsquosub-adult malersquo lsquofemalersquo lsquojuvenilersquo lsquocalfrsquo andlsquounidenti edrsquo

Results

lsquoCompletersquo and lsquodata-decientrsquo sightingsNinety-four sightings of killer whales in Papua NewGuinea waters were complied Twenty-seven of allrecords had either photographs or videotape tocon rm species identi cation Table 1 lists thosesightings where exact date and location wereknown Of these lsquocompletersquo killer whale sightings(n=37) 567 come from the Kimbe Bay area(West New Britain Island)

Table 2 lists lsquodata-de cientrsquo sightings (n=57) forwhich exact dates or precise locations could not beestablished To enable future researchers access todata and clarity of the records all known lsquodata-de cientrsquo records are listed here However it ispossible that some records in Table 2 are duplicateseg sighting No 10 (Table 1) and sighting No 19(Table 2) both record killer whales at BradfordShoal Kimbe Bay in 1994 and both record forag-ing on a shark yet these sightings cannot con-clusively be shown to be either the same nordiVerent events

Sightings by month and yearRecords from Table 1 and 2 (lsquocompletersquo and lsquodata-de cientrsquo) were plotted by month where known(n=52) (Fig 3) The most sightings were recordedin April (n=15) followed by July (n=8) There wereno sightings recorded for January or February (Fig3) For a 15 year period (1987ndash2002) killer whaleshave been sighted each year (with the exception of1989 and 1990mdashTable 1)

Photo-identi cationAll killer whales photographed in Papua NewGuinea with high quality images were identi ableThe Papua New Guinea killer whale photo-identi cation catalogue is currently comprised ofdorsal n saddle-patch and eye-patch surfacephotographs and side-on full-body and partial-body underwater photographs (catalogue held byVisser) From these images 14 unique animals wereregistered in the catalogue (PNG1ndashPNG14) Ofthese two are adult males three are females one is

151Killer whale sightings near Papua New Guinea

Tab

le1

lsquoCom

plet

ersquore

cord

sof

sigh

ting

sof

kille

rw

hale

sin

Pap

uaN

ewG

uine

aw

ater

s(e

xact

date

and

loca

tion

know

n)

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce(p

c=

pers

onal

com

mun

icat

ion)

123

Apr

il19

8716

00ndash1

730

hSu

sanrsquo

sR

eef

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)1

736

+S1

50)0

817

+E

Und

erw

ater

phot

ogra

phs

App

roxi

mat

ely

15(1

adul

tm

ale

calv

es)

Spy-

hopp

edan

dlo

oked

atbo

at

Swim

mer

sen

tere

dth

ew

ater

and

the

kille

rw

hale

sap

proa

ched

wit

hin

15m

M

Ben

jam

in1

pc

226

June

1988

atsu

nset

OV

Aun

aV

illag

eW

uvul

uIs

land

B

ism

ark

Arc

hipe

lago

01)4

497

+S1

42)4

895

+E

No

phot

ogra

phs

3(1

adul

tm

ale

2fe

mal

es)

Dor

sal

ns

silh

ouet

ted

inth

edi

stan

ce

C

Dav

is2

ampL

P

reze

lin3

pc

327

June

1988

0900

ndash190

0h

OV

Aun

aV

illag

eW

uvul

uIs

land

B

ism

ark

Arc

hipe

lago

01)4

497

+S1

42)4

895

+E

Und

erw

ater

and

surf

ace

vide

otap

ean

dun

derw

ater

phot

ogra

phs

3(1

adul

tm

ale

2fe

mal

es)

0900

hfo

ragi

ngon

a2

1m

man

tara

y16

00h

fora

ging

onth

ree

2ndash3

mgr

eyre

efsh

arks

Em

erge

dfr

omde

eper

on

ew

ith

am

anta

ray

upsi

de-d

own

and

fully

inta

ctin

its

mou

th

whi

chw

assh

aken

lsquot

orn

topi

eces

rsquoan

dea

ten

By

1600

hon

efe

mal

ean

dm

ale

kille

rw

hale

rem

aine

dT

hree

grey

reef

shar

ksw

ere

caug

htan

dea

chhe

ldal

ive

and

upsi

de-d

own

befo

rebe

ing

eate

nB

oth

the

mal

ean

dfe

mal

eca

ught

ash

ark

Cir

cled

the

isla

ndth

ree

tim

es

Adu

ltm

ale

had

lsquobul

gersquo

infr

ont

ofdo

rsal

nan

dgr

eyun

der-

uke

s

C

Dav

is2

ampL

P

reze

lin3

ampJ-

M

Cou

stea

u4p

c

47

July

1988

Les

sth

an1

kmoV

the

SWco

rner

ofW

uvul

uIs

land

B

ism

ark

Arc

hipe

lago

01)4

497

+S1

42)4

895

+E

No

phot

ogra

phs

2Sn

orke

lled

wit

hth

em

P

Mun

day5

pc

519

July

1988

OV

Wuv

ulu

Isla

nd

Bis

mar

kA

rchi

pela

go01

)44

97+S

142

)48

95+E

No

phot

ogra

phs

Unk

now

nO

bser

ved

bype

ople

from

the

loca

lvi

llage

sP

M

unda

y5p

c

621

July

1988

OV

Wuv

ulu

Isla

nd

Bis

mar

kA

rchi

pela

go01

)44

97+S

142

)48

95+E

No

phot

ogra

phs

Unk

now

nO

bser

ved

bype

ople

from

the

loca

lvi

llage

sP

M

unda

y5p

c

152 I N Visser and F J Bonoccorso

Tab

le1

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce(p

c=

pers

onal

com

mun

icat

ion)

730

July

1988

OV

Wuv

ulu

Isla

nd

Bis

mar

kA

rchi

pela

go01

)44

97+S

142

)48

95+E

No

phot

ogra

phs

Unk

now

nA

repo

rtfr

omlo

cal

peop

le

P

Mun

day5

pc

89

Apr

il19

9109

30h

2m

iles

oVW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)26

34+S

150

)05

22+E

No

phot

ogra

phs

3(2

fem

ales

1

calf

)A

ppro

ache

dbo

at

Enc

ount

erte

rmin

ated

afte

r20

min

due

todi

vesc

hedu

le

M

Ben

jam

in1

pc

912

Nov

embe

r19

9109

00ndash1

300

h

Res

torf

Isla

ndto

war

dsW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

30+S

150

)06

05+E

Surf

ace

vide

otap

e5

(1ad

ult

mal

e1

sub-

adul

tm

ale)

Adu

ltm

ale

wit

hid

enti

cat

ion

feat

ure

(not

ch)

toti

pof

n

D

Egl

itis

6p

c

1025

May

1994

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

78+E

Und

erw

ater

phot

ogra

phat

WP

R

3(1

fem

ale

1ca

lf

1un

know

n)F

orag

ing

onsc

allo

ped-

ham

mer

head

shar

k

Pho

togr

aph

show

sfe

mal

eki

ller

wha

le(o

rno

n-sp

rout

edm

ale)

wit

hpa

rtia

llyco

nsum

edsh

ark

drap

edov

ersn

out

Man

yoc

eani

csh

arks

inth

evi

cini

ty

Skin

ner

(199

4)G

Sk

inne

r7p

c

1124

July

1994

OV

WP

R

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

634

+S1

50)0

522

+E

Und

erw

ater

phot

ogra

phat

WP

R

3(1

adul

tm

ale

1fe

mal

e1

calf

)P

hoto

grap

hla

belle

das

lsquoTam

myrsquo

sO

rcas

rsquoT

P

elus

o8amp

M

Ben

jam

in1

pc

123

Aug

ust

1994

1500

ndash170

0h

Nea

rR

esto

rfIs

land

N

avar

aiP

assa

ge

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)1

969

+S1

50)0

358

+E

Dig

ital

lyen

hanc

edph

otog

raph

atW

PR

4(1

adul

tm

ale

2fe

mal

esan

d1

calf

)F

orag

ing

onIn

do-P

aci

csa

ilsh

whi

chap

pear

edto

lsquoexp

lode

rsquow

hen

hit

Wit

hth

eki

ller

wha

les

for

2h

Asa

ilsh

cam

eup

and

hid

unde

rth

ebo

at

The

visi

bilit

yw

aspo

or

Pho

togr

aph

labe

lled

inco

rrec

tly

asSe

ptem

ber

1994

Cza

rny

(199

4)M

C

zarn

y9amp

M

Ben

jam

in1

pc

137

Apr

il19

9510

00ndash1

100

h15

mile

sou

tfr

omW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)26

30+S

150

)20

34+E

No

phot

ogra

phs

1(a

dult

mal

e)A

ttem

pts

mad

eto

ente

rth

ew

ater

wit

hth

ean

imal

bu

tit

avoi

ded

the

boat

and

the

dive

rs

M

Ben

jam

in1

pc

153Killer whale sightings near Papua New Guinea

Tab

le1

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce(p

c=

pers

onal

com

mun

icat

ion)

1410

July

1996

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

80+E

Surf

ace

phot

ogra

phs

3B

owri

ding

T

P

elus

o8p

c

153

Dec

embe

r19

96In

side

Fir

stR

eef

oVW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)26

34+S

150

)05

22+E

Surf

ace

phot

ogra

phs

3C

lose

appr

oach

esto

the

boat

So

me

swim

min

gup

side

-dow

n

M

Ben

jam

in1

pc

166

Oct

ober

1997

1200

ndash143

0h

Chr

isti

nersquos

Ree

fth

ento

war

dsR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)18

32+S

150

)07

35+E

No

phot

ogra

phs

At

leas

t20

Seen

inas

soci

atio

nw

ith

appr

oxim

atel

y12

sper

mw

hale

sin

clud

ing

calv

es

The

yap

pear

edto

behu

ntin

gth

esp

erm

wha

les

Squi

dpa

rts

oat

ing

inth

ew

ater

W

hen

seco

ndbo

atap

proa

ched

ki

ller

wha

les

split

oVfr

omsp

erm

wha

les

and

left

area

rapi

dly

Und

erw

ater

phot

ogra

phs

ofth

esp

erm

wha

les

atW

PR

T

Pel

uso8

M

B

enja

min

1amp

M

Wes

tmor

land

10

pc

1710

July

1998

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

419+

S15

0)17

759

+E

Und

erw

ater

vide

otap

e3

Bow

ridi

ng

One

anim

alha

dgr

ey-u

nder

uke

sT

P

elus

o8p

c

183

Oct

ober

1998

1030

ndash133

0h

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

76+E

Und

erw

ater

phot

ogra

phs

atW

PR

8(2

adul

tm

ales

2

fem

ales

2

juve

nile

s2

calv

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155Killer whale sightings near Papua New Guinea

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158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

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219

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161Killer whale sightings near Papua New Guinea

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Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

ayfr

omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

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mal

e)T

his

adul

tm

ale

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mal

esi

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dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

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avel

ling

ina

sout

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ster

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rect

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gth

eco

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App

roac

hed

boat

and

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ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

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esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 2: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

lsquoInternetrsquo anecdotal sightings and unpublisheddata were sourced for details of killer whale sight-ings Records were divided into two types lsquocom-pletersquo and lsquodata-decientrsquo For lsquocompletersquo recordsan exact date and an exact location was known(Table 1 Figure 1) whereas for lsquodata-de cientrsquorecords only a month or year was known or nodate at all and an exact location may not have beenknown Because uncertainty in dates could result inconfusion or replication of sightings without dateslsquodata-decientrsquo records were listed in a separatetable (Table 2 Figure 2)

Although species identi cation may be uncertainwhen suggested by non-specialists killer whales areconsidered one of the easiest species of marinemammal to identify at sea based on their sizepostocular white patch and the large dorsal ns on males (Heyning amp Dahlheim 1988) Inaddition many observations recorded here wereaccompanied by photographs or videotape or theobserver had multiple encounters with the specieseg M Benjamin and T Peluso (Table 1)

Photo-identi cationPhoto-identication uses photographs to recordindividual congenital andor acquired identi cationmarks (Hammond et al 1990) For killer whalesevery individual can be uniquely identi ed fromhigh-quality photographs (Baird 2000) The dorsal n is the main feature photographed because it isexposed above water most often (Bigg 1982) Somekiller whale research projects use photographs ofonly one side of the dorsal n eg in the Paci cNorth West (Ford amp Ellis 1999 Ford et al 1994)and Norway (T Similauml pers comm) Howeverwherever possible during this study both sides ofthe killer whales were photographed as pigmenta-tion patterns can diVer considerably on each side ofan animal (Leatherwood et al 1984 Visser ampMaumlkelaumlinen 2000) and a record of both sidescould improve the chances of subsequent matchesMoreover this allows photographs from the public(which may be taken of either side of an animal) tobe matched (Visser amp Maumlkelaumlinen 2000)

Killer whales can also be photo-identied by theirdistinctive saddle patches (Baird amp Stacey 1988Bigg 1982) eye patches (Visser amp Maumlkelaumlinen2000) pigmentation patterns on the underside ofthe tail (Visser 2000b) malformations (Berghan ampVisser 2000) scars from propellers (Visser 1999bVisser amp Fertl 2000) and other scars such as teethrake marks (Baird 2000 Visser 1998) Thereforephotographs (including underwater images) andvideotape illustrating any unique features werecollected

To catalogue the killer whales each animal wasassigned a unique consecutive number preceded bythe letters PNG signifying that it was identi ed in

Papua New Guinea waters ie PNG1 PNG2PNG3 etc This catalogue was compared to thenearest geographic population of killer whales forwhich an identi cation catalogue is held ie NewZealand

Agesex classi cationPhoto-identied killer whales were grouped byage and sex following Bigg (1982) and Bigget al (1990) These groupings were lsquoadult malersquolsquosub-adult malersquo lsquofemalersquo lsquojuvenilersquo lsquocalfrsquo andlsquounidenti edrsquo

Results

lsquoCompletersquo and lsquodata-decientrsquo sightingsNinety-four sightings of killer whales in Papua NewGuinea waters were complied Twenty-seven of allrecords had either photographs or videotape tocon rm species identi cation Table 1 lists thosesightings where exact date and location wereknown Of these lsquocompletersquo killer whale sightings(n=37) 567 come from the Kimbe Bay area(West New Britain Island)

Table 2 lists lsquodata-de cientrsquo sightings (n=57) forwhich exact dates or precise locations could not beestablished To enable future researchers access todata and clarity of the records all known lsquodata-de cientrsquo records are listed here However it ispossible that some records in Table 2 are duplicateseg sighting No 10 (Table 1) and sighting No 19(Table 2) both record killer whales at BradfordShoal Kimbe Bay in 1994 and both record forag-ing on a shark yet these sightings cannot con-clusively be shown to be either the same nordiVerent events

Sightings by month and yearRecords from Table 1 and 2 (lsquocompletersquo and lsquodata-de cientrsquo) were plotted by month where known(n=52) (Fig 3) The most sightings were recordedin April (n=15) followed by July (n=8) There wereno sightings recorded for January or February (Fig3) For a 15 year period (1987ndash2002) killer whaleshave been sighted each year (with the exception of1989 and 1990mdashTable 1)

Photo-identi cationAll killer whales photographed in Papua NewGuinea with high quality images were identi ableThe Papua New Guinea killer whale photo-identi cation catalogue is currently comprised ofdorsal n saddle-patch and eye-patch surfacephotographs and side-on full-body and partial-body underwater photographs (catalogue held byVisser) From these images 14 unique animals wereregistered in the catalogue (PNG1ndashPNG14) Ofthese two are adult males three are females one is

151Killer whale sightings near Papua New Guinea

Tab

le1

lsquoCom

plet

ersquore

cord

sof

sigh

ting

sof

kille

rw

hale

sin

Pap

uaN

ewG

uine

aw

ater

s(e

xact

date

and

loca

tion

know

n)

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce(p

c=

pers

onal

com

mun

icat

ion)

123

Apr

il19

8716

00ndash1

730

hSu

sanrsquo

sR

eef

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)1

736

+S1

50)0

817

+E

Und

erw

ater

phot

ogra

phs

App

roxi

mat

ely

15(1

adul

tm

ale

calv

es)

Spy-

hopp

edan

dlo

oked

atbo

at

Swim

mer

sen

tere

dth

ew

ater

and

the

kille

rw

hale

sap

proa

ched

wit

hin

15m

M

Ben

jam

in1

pc

226

June

1988

atsu

nset

OV

Aun

aV

illag

eW

uvul

uIs

land

B

ism

ark

Arc

hipe

lago

01)4

497

+S1

42)4

895

+E

No

phot

ogra

phs

3(1

adul

tm

ale

2fe

mal

es)

Dor

sal

ns

silh

ouet

ted

inth

edi

stan

ce

C

Dav

is2

ampL

P

reze

lin3

pc

327

June

1988

0900

ndash190

0h

OV

Aun

aV

illag

eW

uvul

uIs

land

B

ism

ark

Arc

hipe

lago

01)4

497

+S1

42)4

895

+E

Und

erw

ater

and

surf

ace

vide

otap

ean

dun

derw

ater

phot

ogra

phs

3(1

adul

tm

ale

2fe

mal

es)

0900

hfo

ragi

ngon

a2

1m

man

tara

y16

00h

fora

ging

onth

ree

2ndash3

mgr

eyre

efsh

arks

Em

erge

dfr

omde

eper

on

ew

ith

am

anta

ray

upsi

de-d

own

and

fully

inta

ctin

its

mou

th

whi

chw

assh

aken

lsquot

orn

topi

eces

rsquoan

dea

ten

By

1600

hon

efe

mal

ean

dm

ale

kille

rw

hale

rem

aine

dT

hree

grey

reef

shar

ksw

ere

caug

htan

dea

chhe

ldal

ive

and

upsi

de-d

own

befo

rebe

ing

eate

nB

oth

the

mal

ean

dfe

mal

eca

ught

ash

ark

Cir

cled

the

isla

ndth

ree

tim

es

Adu

ltm

ale

had

lsquobul

gersquo

infr

ont

ofdo

rsal

nan

dgr

eyun

der-

uke

s

C

Dav

is2

ampL

P

reze

lin3

ampJ-

M

Cou

stea

u4p

c

47

July

1988

Les

sth

an1

kmoV

the

SWco

rner

ofW

uvul

uIs

land

B

ism

ark

Arc

hipe

lago

01)4

497

+S1

42)4

895

+E

No

phot

ogra

phs

2Sn

orke

lled

wit

hth

em

P

Mun

day5

pc

519

July

1988

OV

Wuv

ulu

Isla

nd

Bis

mar

kA

rchi

pela

go01

)44

97+S

142

)48

95+E

No

phot

ogra

phs

Unk

now

nO

bser

ved

bype

ople

from

the

loca

lvi

llage

sP

M

unda

y5p

c

621

July

1988

OV

Wuv

ulu

Isla

nd

Bis

mar

kA

rchi

pela

go01

)44

97+S

142

)48

95+E

No

phot

ogra

phs

Unk

now

nO

bser

ved

bype

ople

from

the

loca

lvi

llage

sP

M

unda

y5p

c

152 I N Visser and F J Bonoccorso

Tab

le1

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce(p

c=

pers

onal

com

mun

icat

ion)

730

July

1988

OV

Wuv

ulu

Isla

nd

Bis

mar

kA

rchi

pela

go01

)44

97+S

142

)48

95+E

No

phot

ogra

phs

Unk

now

nA

repo

rtfr

omlo

cal

peop

le

P

Mun

day5

pc

89

Apr

il19

9109

30h

2m

iles

oVW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)26

34+S

150

)05

22+E

No

phot

ogra

phs

3(2

fem

ales

1

calf

)A

ppro

ache

dbo

at

Enc

ount

erte

rmin

ated

afte

r20

min

due

todi

vesc

hedu

le

M

Ben

jam

in1

pc

912

Nov

embe

r19

9109

00ndash1

300

h

Res

torf

Isla

ndto

war

dsW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

30+S

150

)06

05+E

Surf

ace

vide

otap

e5

(1ad

ult

mal

e1

sub-

adul

tm

ale)

Adu

ltm

ale

wit

hid

enti

cat

ion

feat

ure

(not

ch)

toti

pof

n

D

Egl

itis

6p

c

1025

May

1994

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

78+E

Und

erw

ater

phot

ogra

phat

WP

R

3(1

fem

ale

1ca

lf

1un

know

n)F

orag

ing

onsc

allo

ped-

ham

mer

head

shar

k

Pho

togr

aph

show

sfe

mal

eki

ller

wha

le(o

rno

n-sp

rout

edm

ale)

wit

hpa

rtia

llyco

nsum

edsh

ark

drap

edov

ersn

out

Man

yoc

eani

csh

arks

inth

evi

cini

ty

Skin

ner

(199

4)G

Sk

inne

r7p

c

1124

July

1994

OV

WP

R

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

634

+S1

50)0

522

+E

Und

erw

ater

phot

ogra

phat

WP

R

3(1

adul

tm

ale

1fe

mal

e1

calf

)P

hoto

grap

hla

belle

das

lsquoTam

myrsquo

sO

rcas

rsquoT

P

elus

o8amp

M

Ben

jam

in1

pc

123

Aug

ust

1994

1500

ndash170

0h

Nea

rR

esto

rfIs

land

N

avar

aiP

assa

ge

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)1

969

+S1

50)0

358

+E

Dig

ital

lyen

hanc

edph

otog

raph

atW

PR

4(1

adul

tm

ale

2fe

mal

esan

d1

calf

)F

orag

ing

onIn

do-P

aci

csa

ilsh

whi

chap

pear

edto

lsquoexp

lode

rsquow

hen

hit

Wit

hth

eki

ller

wha

les

for

2h

Asa

ilsh

cam

eup

and

hid

unde

rth

ebo

at

The

visi

bilit

yw

aspo

or

Pho

togr

aph

labe

lled

inco

rrec

tly

asSe

ptem

ber

1994

Cza

rny

(199

4)M

C

zarn

y9amp

M

Ben

jam

in1

pc

137

Apr

il19

9510

00ndash1

100

h15

mile

sou

tfr

omW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)26

30+S

150

)20

34+E

No

phot

ogra

phs

1(a

dult

mal

e)A

ttem

pts

mad

eto

ente

rth

ew

ater

wit

hth

ean

imal

bu

tit

avoi

ded

the

boat

and

the

dive

rs

M

Ben

jam

in1

pc

153Killer whale sightings near Papua New Guinea

Tab

le1

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce(p

c=

pers

onal

com

mun

icat

ion)

1410

July

1996

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

80+E

Surf

ace

phot

ogra

phs

3B

owri

ding

T

P

elus

o8p

c

153

Dec

embe

r19

96In

side

Fir

stR

eef

oVW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)26

34+S

150

)05

22+E

Surf

ace

phot

ogra

phs

3C

lose

appr

oach

esto

the

boat

So

me

swim

min

gup

side

-dow

n

M

Ben

jam

in1

pc

166

Oct

ober

1997

1200

ndash143

0h

Chr

isti

nersquos

Ree

fth

ento

war

dsR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)18

32+S

150

)07

35+E

No

phot

ogra

phs

At

leas

t20

Seen

inas

soci

atio

nw

ith

appr

oxim

atel

y12

sper

mw

hale

sin

clud

ing

calv

es

The

yap

pear

edto

behu

ntin

gth

esp

erm

wha

les

Squi

dpa

rts

oat

ing

inth

ew

ater

W

hen

seco

ndbo

atap

proa

ched

ki

ller

wha

les

split

oVfr

omsp

erm

wha

les

and

left

area

rapi

dly

Und

erw

ater

phot

ogra

phs

ofth

esp

erm

wha

les

atW

PR

T

Pel

uso8

M

B

enja

min

1amp

M

Wes

tmor

land

10

pc

1710

July

1998

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

419+

S15

0)17

759

+E

Und

erw

ater

vide

otap

e3

Bow

ridi

ng

One

anim

alha

dgr

ey-u

nder

uke

sT

P

elus

o8p

c

183

Oct

ober

1998

1030

ndash133

0h

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

76+E

Und

erw

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158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

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219

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161Killer whale sightings near Papua New Guinea

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3620

00C

ham

iso

Cha

nnel

N

ewH

anov

erIs

land

02)4

007

+S1

50)2

789

+E

Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

ayfr

omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

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e)T

his

adul

tm

ale

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esi

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Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

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ale

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ough

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beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

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dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

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ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

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adca

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serv

edun

derw

ater

T

P

elus

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c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

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stof

Por

tM

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by09

)42

92+S

147

)24

05+E

Surf

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phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

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mal

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App

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hed

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ract

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kelle

rs

Dep

arte

dw

hen

scub

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ed

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esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

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52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 3: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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155Killer whale sightings near Papua New Guinea

Tab

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156 I N Visser and F J Bonoccorso

Tab

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May

2002

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157Killer whale sightings near Papua New Guinea

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158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

lsquoDat

a-de

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reco

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ofsi

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loca

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not

know

n)

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ome

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)13

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ame

from

the

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ctio

nof

Cap

eV

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B

D

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Eas

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M

ilne

Bay

10)1

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605

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No

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ogra

phs

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eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

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t

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Dis

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)19

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Stet

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(rec

ord

No

47

this

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e)

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twee

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ie36

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Stet

tin

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imbe

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est

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tain

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ble)

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imum

of35

0km

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itch

ie36

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165Killer whale sightings near Papua New Guinea

Tab

le2

Con

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ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

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Pho

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Num

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263

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)K

iller

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P

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Por

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92+S

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Surf

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(1ad

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mal

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iller

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Bal

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37

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N

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Not

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For

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cies

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Tia

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Eamp

D

Ano

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51U

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Big

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163

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Not

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Obs

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ilne

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phs

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nally

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D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

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658

+E

Not

stat

edN

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ated

No

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her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

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wn

Wah

ooP

oint

M

ilne

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10)2

731

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658

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Not

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ated

No

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her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

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ntamp

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nort

hsi

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Miln

eB

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40+S

150

)59

28+E

Surf

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H

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nkno

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Hei

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pc

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nkno

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Tro

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151

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M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 4: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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153Killer whale sightings near Papua New Guinea

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157Killer whale sightings near Papua New Guinea

Tab

le1

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

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done

sia

158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

lsquoDat

a-de

cie

ntrsquo

reco

rds

ofsi

ghti

ngs

ofki

ller

wha

les

inP

apua

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(exa

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loca

tion

not

know

n)

Dat

eamp

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e

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atio

nL

atit

ude

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togr

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Num

ber

ofan

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s(s

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ge)

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gbe

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our

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ce

119

56ndash1

958

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tern

lati

tude

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arN

ewG

uine

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rita

in

and

Dol

ak

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

219

56ndash1

958

Dur

ing

July

toD

ecem

ber

Eas

tern

lati

tude

sne

arN

ewG

uine

aN

ewB

rita

in

and

Dol

ak

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

3Se

ptem

ber

1956

Nei

ghbo

urho

odof

15)S

toth

eso

uth

ofN

ewG

uine

aIs

land

15)1

587

+S1

54)1

857

+E

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngtu

naoV

long

-lin

es

(Var

ious

spec

ies

oftu

nam

enti

oned

bu

tno

neid

enti

ed

spec

ica

lly)

lsquolsquoThe

sout

hern

limit

ofth

eap

pear

ance

ofO

rcin

usm

oved

toth

ene

ighb

ourh

ood

of15

)Sto

the

sout

hof

New

Gui

nea

inSe

ptem

ber

1956

rsquorsquo

Iwas

hita

etal

19

63

4D

ecem

ber

1958

Nei

ghbo

urho

odof

19)S

toth

eso

uth

ofN

ewG

uine

aIs

land

19)0

00+

S15

4)32

58+

E

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngtu

naoV

long

-lin

es

(Var

ious

spec

ies

oftu

nam

enti

oned

bu

tno

neid

enti

ed

spec

ica

lly)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

5P

rior

to19

64A

roun

dN

ewG

uine

aan

dN

ewB

rita

inIs

land

s07

)23

99+S

150

)51

359+

E

Not

stat

edN

otst

ated

Tak

ing

yello

w-

ntu

naan

dbi

g-ey

etu

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omlo

ng-l

ines

No

furt

her

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ated

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bram

ania

m(1

964)

6P

rior

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72N

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ast

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land

Not

stat

edN

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ated

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uaN

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ater

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uent

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ting

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port

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oVth

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uine

arsquorsquo

Daw

bin

(197

2)

719

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and

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a

Not

stat

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otst

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Tak

ing

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2of

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uled

wer

em

aule

dby

shar

ksan

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ller

wha

lesrsquo

rsquo

(Wri

ght

1980

)

160 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

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our

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819

821

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er)

No

phot

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phs

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lf)

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at

A

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9A

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y19

85T

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08)3

741

+S1

51)1

292

+E1

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ith

Bob

Hal

stea

dab

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Mel

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ian

Exp

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r

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pc

10A

pril

1987

1km

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nrsquos

Ree

fK

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

36+S

150

)08

17+E

Und

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ater

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phs

App

roxi

mat

ely

15(1

adul

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lf)

Spen

t1

hw

ith

them

from

appr

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atel

y16

00h

Snor

kelle

dw

ith

am

othe

ran

dca

lfw

hom

ade

clos

eap

proa

ches

(3m

)un

derw

ater

M

Ben

jam

in1

pc

11U

nkno

wn

but

prio

rto

June

1988

Wuv

ulu

Ato

ll01

)44

97+S

142

)48

95+E

Not

stat

edK

iller

wha

les

visi

tev

ery

year

an

dth

esh

arks

leav

e

Wuv

ulu

resi

dent

squ

oted

inC

oust

eau

ampR

icha

rds

(198

9)12

Apr

il19

89N

ear

Por

tM

ores

by09

)28

06+S

147

)08

30+E

lsquoLar

gegr

ouprsquo

Sigh

ted

two

days

ina

row

(see

reco

rdN

o13

th

ista

ble)

M

Ben

jam

in1

pc

13A

pril

1989

Nea

rP

ort

Mor

esby

09)2

806

+S1

47)0

830

+ElsquoL

arge

grou

prsquoSe

cond

sigh

ting

ofw

hat

was

pres

umed

the

sam

ean

imal

s(s

eere

cord

No

12

this

tabl

e)

M

Ben

jam

in1

pc

14A

pril

1991

(dur

ing

Eas

ter)

App

roxi

mat

ely

four

mile

sno

rth

ofW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)22

86+S

150

)06

90+E

3N

ofu

rthe

rde

tails

stat

ed

M

Ben

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pc

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91B

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land

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adan

gP

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04)4

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+S1

46)1

052

+E

Not

stat

edO

neor

mor

epo

dsea

chye

ar

T

Row

land

25

pc

16N

ovem

ber

1992

Kav

ieng

N

ewIr

elan

dP

rovi

nce

02)3

473

+S1

50)5

311

+E

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eral

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rthe

rde

tails

stat

ed

M

Ben

jam

in1

pc

1719

92B

agab

agIs

land

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adan

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rovi

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04)4

736

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052

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Not

stat

edO

neor

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epo

dsea

chye

ar

T

Row

land

25

pc

161Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

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togr

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ideo

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Num

ber

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land

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04)4

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stat

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neor

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ar

T

Row

land

25

pc

19M

ay19

94B

radf

ord

Shoa

ls

Kim

beB

ay

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tN

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land

05)0

942

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776

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Und

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vide

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(1ca

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For

agin

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A

nony

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20P

rior

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dof

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Kim

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Wes

tN

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land

05)1

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stat

edIn

divi

dual

sor

smal

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4)F

orag

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ona

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d-ha

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erhe

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on

Are

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ally

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hin

Kim

beB

ay

Kill

erw

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ere

seen

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ree

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sion

sin

1994

A

tB

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med

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scal

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2119

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stat

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neor

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chye

ar

T

Row

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25

pc

2219

95B

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land

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adan

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04)4

736

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052

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Not

stat

edO

neor

mor

epo

dsea

chye

ar

T

Row

land

25

pc

23N

ovem

ber

1996

Nea

rIn

glis

reef

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)14

12+S

150

)10

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No

phot

ogra

phs

2N

ofu

rthe

rde

tails

stat

ed

M

Ben

jam

in1

pc

24D

ecem

ber

1996

Wes

tern

end

ofN

ewB

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land

05)3

895

+S1

48)1

581

+E

8O

bser

ved

from

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MV

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M

B

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min

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arly

Dec

embe

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9608

30ndash1

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h

WP

R

Kim

beB

ay

Wes

tN

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rita

inIs

land

05)1

412

+S1

50)1

018

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No

phot

ogra

phs

6(1

adul

tm

ale)

Fol

low

edto

Res

torf

Isla

nd

M

Ben

jam

in1

pc

162 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

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ongi

tude

Pho

togr

aphs

V

ideo

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Num

ber

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imal

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ge)

For

agin

gbe

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our

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Sour

ce

26P

rior

to19

96E

ast

Cap

eM

ilne

Bay

10)1

464

+S1

50)5

335

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rfac

eph

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raph

pa

ge14

31

(adu

ltm

ale)

For

agin

gon

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Sn

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hth

eki

ller

wha

lew

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ting

It

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ght

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drop

W

hen

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ough

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back

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ain

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Hal

stea

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996)

27M

arch

1997

Wit

uIs

land

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est

New

Bri

tain

Pro

vinc

e04

)41

57+S

149

)25

76+E

Und

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ogra

phs

Not

stat

edF

orag

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blue

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tted

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Obs

erve

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atM

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Gle

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Apr

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Isla

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rovi

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04)4

310

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49)3

288

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No

phot

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phs

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ved

from

boat

Sta

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rE

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imal

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pril

1988

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)37

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eth

ela

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ef

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ange

d

JK

inch

27

30N

ovem

ber

1999

Mw

ataw

aB

each

K

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Isla

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ayP

rovi

nce

08)3

329

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174

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App

roxi

mat

ely

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oup

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ared

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inds

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30

pc

3119

99N

WN

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)15

42+S

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)59

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No

phot

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phs

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wo

kille

rw

hale

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me

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D

Mit

chel

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pc

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99N

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ilne

Bay

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No

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phs

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ame

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ain

D

Mit

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163Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

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Tim

e

Loc

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Num

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Seen

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Cha

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13

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37M

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2001

Sout

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No

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2001

Bet

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rfIs

land

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est

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tain

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nd05

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82+S

150

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89+E

No

phot

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phs

3C

lose

into

shor

e10

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164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

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Dat

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Num

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phot

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from

the

SEse

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wth

ean

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hth

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35

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No

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pc

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No

phot

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dire

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Cap

eV

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D

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pc

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Rav

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M

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Bay

10)1

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605

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No

phot

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war

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Isla

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win

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34

pc

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Star

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Lus

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Isla

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08)1

951

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P

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Pro

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this

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km

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pc

47U

nkno

wn

Stet

tin

Bay

K

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Bay

W

est

New

Bri

tain

Isla

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)23

71+S

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ista

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betw

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min

imum

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0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

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Loc

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atit

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Num

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263

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wha

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P

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92+S

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Dep

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Mal

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37

pc

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N

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998

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For

agin

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cies

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O

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Big

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02)2

163

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87+

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Not

stat

edN

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Obs

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dfr

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D

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War

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Stra

it

Cap

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M

ilne

Bay

Pro

vinc

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32+S

150

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45+E

No

phot

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Occ

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D

M

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M

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Bay

10)2

731

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658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

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38

pc

54U

nkno

wn

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M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 5: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

Tab

le1

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

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ge)

For

agin

gbe

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tails

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ce(p

c=

pers

onal

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mun

icat

ion)

1410

July

1996

Bra

dfor

dSh

oals

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

80+E

Surf

ace

phot

ogra

phs

3B

owri

ding

T

P

elus

o8p

c

153

Dec

embe

r19

96In

side

Fir

stR

eef

oVW

PR

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)26

34+S

150

)05

22+E

Surf

ace

phot

ogra

phs

3C

lose

appr

oach

esto

the

boat

So

me

swim

min

gup

side

-dow

n

M

Ben

jam

in1

pc

166

Oct

ober

1997

1200

ndash143

0h

Chr

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fth

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war

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rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

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32+S

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)07

35+E

No

phot

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phs

At

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ith

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calv

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wha

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Squi

dpa

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ew

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W

hen

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proa

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ller

wha

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split

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omsp

erm

wha

les

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left

area

rapi

dly

Und

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phot

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phs

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atW

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Pel

uso8

M

B

enja

min

1amp

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Wes

tmor

land

10

pc

1710

July

1998

Bra

dfor

dSh

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K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

419+

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0)17

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elus

o8p

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183

Oct

ober

1998

1030

ndash133

0h

Bra

dfor

dSh

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K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)09

42+S

150

)17

76+E

Und

erw

ater

phot

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phs

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PR

8(2

adul

tm

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2

fem

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juve

nile

s2

calv

es)

Obs

erve

dun

derw

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from

the

lsquodol

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the

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grou

p

JJo

hnso

n11

pc

John

son

(199

9)

154 I N Visser and F J Bonoccorso

Tab

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eamp

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Loc

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nL

atit

ude

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ongi

tude

Pho

togr

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Num

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ofan

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mun

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aine

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side

nts

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Man

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Apr

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asik

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man

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10)1

243

+S1

61)0

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phot

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phs

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hsu

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ndit

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itch

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Apr

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Apr

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No

furt

her

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Pel

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pc

155Killer whale sightings near Papua New Guinea

Tab

le1

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tinu

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258

Aug

ust

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156 I N Visser and F J Bonoccorso

Tab

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May

2002

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Col

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157Killer whale sightings near Papua New Guinea

Tab

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2002

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158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

lsquoDat

a-de

cie

ntrsquo

reco

rds

ofsi

ghti

ngs

ofki

ller

wha

les

inP

apua

New

Gui

nea

wat

ers

(exa

ctda

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loca

tion

not

know

n)

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eamp

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e

Loc

atio

nL

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ude

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tude

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togr

aphs

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ideo

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Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

119

56ndash1

958

Eas

tern

lati

tude

sne

arN

ewG

uine

aN

ewB

rita

in

and

Dol

ak

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

219

56ndash1

958

Dur

ing

July

toD

ecem

ber

Eas

tern

lati

tude

sne

arN

ewG

uine

aN

ewB

rita

in

and

Dol

ak

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

3Se

ptem

ber

1956

Nei

ghbo

urho

odof

15)S

toth

eso

uth

ofN

ewG

uine

aIs

land

15)1

587

+S1

54)1

857

+E

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

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naoV

long

-lin

es

(Var

ious

spec

ies

oftu

nam

enti

oned

bu

tno

neid

enti

ed

spec

ica

lly)

lsquolsquoThe

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hern

limit

ofth

eap

pear

ance

ofO

rcin

usm

oved

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ene

ighb

ourh

ood

of15

)Sto

the

sout

hof

New

Gui

nea

inSe

ptem

ber

1956

rsquorsquo

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hita

etal

19

63

4D

ecem

ber

1958

Nei

ghbo

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odof

19)S

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uine

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land

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00+

S15

4)32

58+

E

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stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

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naoV

long

-lin

es

(Var

ious

spec

ies

oftu

nam

enti

oned

bu

tno

neid

enti

ed

spec

ica

lly)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

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rior

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64A

roun

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150

)51

359+

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stat

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ated

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ing

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furt

her

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964)

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ater

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ing

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aule

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ght

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Tab

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Roe

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Ben

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pc

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Not

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les

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1989

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K

imbe

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Ben

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161Killer whale sightings near Papua New Guinea

Tab

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stat

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Row

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942

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agin

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20P

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Kill

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ere

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1994

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adan

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stat

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Row

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25

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23N

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1996

Nea

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Bay

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Bri

tain

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phot

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Ben

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162 I N Visser and F J Bonoccorso

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27

30N

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1999

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ark

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auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

dult

mal

e)T

his

adul

tm

ale

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ough

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esa

me

mal

esi

ghte

dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

les

wer

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avel

ling

ina

sout

hea

ster

lydi

rect

ion

alon

gth

eco

ast

App

roac

hed

boat

and

inte

ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

Mal

esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 6: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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155Killer whale sightings near Papua New Guinea

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156 I N Visser and F J Bonoccorso

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158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

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ller

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Num

ber

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119

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and

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ak

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Rep

orts

ofki

ller

wha

les

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sw

ere

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)

No

furt

her

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ilsst

ated

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ashi

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al

1963

219

56ndash1

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Dur

ing

July

toD

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ber

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tern

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tude

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and

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ak

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Rep

orts

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ller

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les

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ere

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)

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her

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ated

Iw

ashi

taet

al

1963

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ptem

ber

1956

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ghbo

urho

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15)S

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15)1

587

+S1

54)1

857

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1956

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19

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Tab

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161Killer whale sightings near Papua New Guinea

Tab

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162 I N Visser and F J Bonoccorso

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)58

30+S

152

)37

73+E

2O

nth

esu

rfac

eju

stou

tsid

eth

ela

goon

alon

gth

ere

ef

Tid

eha

dju

stch

ange

d

JK

inch

27

30N

ovem

ber

1999

Mw

ataw

aB

each

K

iriw

ina

Isla

nd

Miln

eB

ayP

rovi

nce

08)3

329

+S1

51)1

174

+E

App

roxi

mat

ely

10T

hegr

oup

appe

ared

atm

id-d

ay

follo

win

gth

eco

ntou

rof

the

reef

nort

hwar

d

JL

inds

trom

30

pc

3119

99N

WN

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)15

42+S

150

)59

62+E

No

phot

ogra

phs

2T

wo

kille

rw

hale

sca

me

clos

ein

toth

edi

nghy

C

utth

een

gine

and

they

swam

oV

D

Mit

chel

l28

pc

3219

99N

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)17

30+S

150

)59

25+E

No

phot

ogra

phs

1C

ame

alon

gsid

eth

eve

ssel

then

swam

oVag

ain

D

Mit

chel

l28

pc

163Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

33P

rior

toM

ay20

00G

oshe

nSt

rait

E

ast

Cap

eN

ewG

uine

ato

Cap

eV

ente

nant

N

orm

anby

Isla

nd10

)12

43+S

150

)03

35+E

Not

stat

edlsquoF

requ

entl

ysi

ghte

drsquo

D

Mit

chel

l28

pc

34A

ugus

t20

00R

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

30+S

150

)06

05+E

Surf

ace

phot

ogra

phs

6(1

sub-

adul

tm

ale)

Sub-

adul

tm

ale

had

whi

tepa

tch

onri

ght-

hand

side

ofdo

rsal

n

M

John

son3

1p

c

35D

ecem

ber

2000

Rai

Coa

st

Said

or

Mad

ang

Pro

vinc

e05

)36

02+S

146

)26

31+E

No

phot

ogra

phs

4ndash5

Seen

kille

rw

hale

sse

vera

lti

mes

mov

ing

alon

gth

eco

ast

Inbo

aton

eda

yan

dw

assu

rrou

nded

byab

out

4or

5of

them

O

nesp

y-ho

pped

B

Lea

hy32

pc

3620

00C

ham

iso

Cha

nnel

N

ewH

anov

erIs

land

02)4

007

+S1

50)2

789

+E

Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

ayfr

omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

les

wer

etr

avel

ling

ina

sout

hea

ster

lydi

rect

ion

alon

gth

eco

ast

App

roac

hed

boat

and

inte

ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

Mal

esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 7: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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157Killer whale sightings near Papua New Guinea

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uan

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done

sia

158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

lsquoDat

a-de

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ofki

ller

wha

les

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apua

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Num

ber

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tude

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and

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ak

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stat

edN

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ated

Rep

orts

ofki

ller

wha

les

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long

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tsp

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sw

ere

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)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

219

56ndash1

958

Dur

ing

July

toD

ecem

ber

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tern

lati

tude

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arN

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and

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ak

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Rep

orts

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ller

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les

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ere

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)

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her

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ated

Iw

ashi

taet

al

1963

3Se

ptem

ber

1956

Nei

ghbo

urho

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15)S

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land

15)1

587

+S1

54)1

857

+E

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stat

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ated

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orts

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les

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bu

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oved

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ber

1956

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etal

19

63

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1958

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00+

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4)32

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160 I N Visser and F J Bonoccorso

Tab

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161Killer whale sightings near Papua New Guinea

Tab

le2

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20P

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dof

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Are

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ay

Kill

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ree

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sin

1994

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23N

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1996

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Ben

jam

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162 I N Visser and F J Bonoccorso

Tab

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nsh

Sn

orke

lled

wit

hth

eki

ller

wha

lew

hile

itw

asea

ting

It

brou

ght

the

dead

sun

shto

war

dsth

esu

rfac

eth

enle

tit

drop

W

hen

the

sun

shha

dal

mos

tsu

nkfr

omsi

ght

the

kille

rw

hale

dive

dfo

rit

br

ough

tit

back

toth

esu

rfac

ean

ddr

oppe

dag

ain

He

did

this

seve

ral

tim

esbe

fore

swim

min

gaw

ay

lsquolsquoOrc

aar

ese

enre

gula

rly

atth

issi

tersquorsquo

Hal

stea

d(1

996)

27M

arch

1997

Wit

uIs

land

sW

est

New

Bri

tain

Pro

vinc

e04

)41

57+S

149

)25

76+E

Und

erw

ater

phot

ogra

phs

Not

stat

edF

orag

ing

ona

blue

-spo

tted

ray

Obs

erve

dfr

ombo

atM

VF

eBre

na

Gle

eson

(199

7)B

G

lees

on26

ampM

B

enja

min

1p

c28

Pri

orto

Apr

il19

98L

ama

Shoa

lW

itu

Isla

nds

Wes

tN

ewB

rita

inP

rovi

nce

04)4

310

+S1

49)3

288

+E

No

phot

ogra

phs

3O

bser

ved

from

boat

Sta

rD

ance

rE

nter

edw

ater

wit

hth

ean

imal

s

And

erso

n(1

998)

29A

pril

1988

Pan

asag

usag

uIs

land

sC

alva

dos

chai

n10

)58

30+S

152

)37

73+E

2O

nth

esu

rfac

eju

stou

tsid

eth

ela

goon

alon

gth

ere

ef

Tid

eha

dju

stch

ange

d

JK

inch

27

30N

ovem

ber

1999

Mw

ataw

aB

each

K

iriw

ina

Isla

nd

Miln

eB

ayP

rovi

nce

08)3

329

+S1

51)1

174

+E

App

roxi

mat

ely

10T

hegr

oup

appe

ared

atm

id-d

ay

follo

win

gth

eco

ntou

rof

the

reef

nort

hwar

d

JL

inds

trom

30

pc

3119

99N

WN

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)15

42+S

150

)59

62+E

No

phot

ogra

phs

2T

wo

kille

rw

hale

sca

me

clos

ein

toth

edi

nghy

C

utth

een

gine

and

they

swam

oV

D

Mit

chel

l28

pc

3219

99N

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)17

30+S

150

)59

25+E

No

phot

ogra

phs

1C

ame

alon

gsid

eth

eve

ssel

then

swam

oVag

ain

D

Mit

chel

l28

pc

163Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

33P

rior

toM

ay20

00G

oshe

nSt

rait

E

ast

Cap

eN

ewG

uine

ato

Cap

eV

ente

nant

N

orm

anby

Isla

nd10

)12

43+S

150

)03

35+E

Not

stat

edlsquoF

requ

entl

ysi

ghte

drsquo

D

Mit

chel

l28

pc

34A

ugus

t20

00R

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

30+S

150

)06

05+E

Surf

ace

phot

ogra

phs

6(1

sub-

adul

tm

ale)

Sub-

adul

tm

ale

had

whi

tepa

tch

onri

ght-

hand

side

ofdo

rsal

n

M

John

son3

1p

c

35D

ecem

ber

2000

Rai

Coa

st

Said

or

Mad

ang

Pro

vinc

e05

)36

02+S

146

)26

31+E

No

phot

ogra

phs

4ndash5

Seen

kille

rw

hale

sse

vera

lti

mes

mov

ing

alon

gth

eco

ast

Inbo

aton

eda

yan

dw

assu

rrou

nded

byab

out

4or

5of

them

O

nesp

y-ho

pped

B

Lea

hy32

pc

3620

00C

ham

iso

Cha

nnel

N

ewH

anov

erIs

land

02)4

007

+S1

50)2

789

+E

Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

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omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

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Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

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Und

erw

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otap

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yO

bser

ved

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MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

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93+S

146

)19

49+E

1(a

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his

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tm

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Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

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twee

nis

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inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

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tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

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mal

e)K

iller

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ina

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ster

lydi

rect

ion

alon

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eco

ast

App

roac

hed

boat

and

inte

ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

Mal

esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 8: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

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a-de

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and

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ak

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Rep

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ller

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les

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)

No

furt

her

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ashi

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al

1963

219

56ndash1

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ing

July

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ber

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ak

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ere

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)

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her

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ashi

taet

al

1963

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ptem

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1956

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587

+S1

54)1

857

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161Killer whale sightings near Papua New Guinea

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land

M

ilne

Bay

Pro

vinc

e10

)15

42+S

150

)59

62+E

No

phot

ogra

phs

2T

wo

kille

rw

hale

sca

me

clos

ein

toth

edi

nghy

C

utth

een

gine

and

they

swam

oV

D

Mit

chel

l28

pc

3219

99N

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)17

30+S

150

)59

25+E

No

phot

ogra

phs

1C

ame

alon

gsid

eth

eve

ssel

then

swam

oVag

ain

D

Mit

chel

l28

pc

163Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

33P

rior

toM

ay20

00G

oshe

nSt

rait

E

ast

Cap

eN

ewG

uine

ato

Cap

eV

ente

nant

N

orm

anby

Isla

nd10

)12

43+S

150

)03

35+E

Not

stat

edlsquoF

requ

entl

ysi

ghte

drsquo

D

Mit

chel

l28

pc

34A

ugus

t20

00R

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

30+S

150

)06

05+E

Surf

ace

phot

ogra

phs

6(1

sub-

adul

tm

ale)

Sub-

adul

tm

ale

had

whi

tepa

tch

onri

ght-

hand

side

ofdo

rsal

n

M

John

son3

1p

c

35D

ecem

ber

2000

Rai

Coa

st

Said

or

Mad

ang

Pro

vinc

e05

)36

02+S

146

)26

31+E

No

phot

ogra

phs

4ndash5

Seen

kille

rw

hale

sse

vera

lti

mes

mov

ing

alon

gth

eco

ast

Inbo

aton

eda

yan

dw

assu

rrou

nded

byab

out

4or

5of

them

O

nesp

y-ho

pped

B

Lea

hy32

pc

3620

00C

ham

iso

Cha

nnel

N

ewH

anov

erIs

land

02)4

007

+S1

50)2

789

+E

Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

ayfr

omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

les

wer

etr

avel

ling

ina

sout

hea

ster

lydi

rect

ion

alon

gth

eco

ast

App

roac

hed

boat

and

inte

ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

Mal

esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 9: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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158 I N Visser and F J Bonoccorso

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

lsquoDat

a-de

cie

ntrsquo

reco

rds

ofsi

ghti

ngs

ofki

ller

wha

les

inP

apua

New

Gui

nea

wat

ers

(exa

ctda

teor

loca

tion

not

know

n)

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

119

56ndash1

958

Eas

tern

lati

tude

sne

arN

ewG

uine

aN

ewB

rita

in

and

Dol

ak

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

219

56ndash1

958

Dur

ing

July

toD

ecem

ber

Eas

tern

lati

tude

sne

arN

ewG

uine

aN

ewB

rita

in

and

Dol

ak

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

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tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

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c

49U

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wn

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nacl

esrsquo

15m

iles

sout

hea

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Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

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ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

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les

wer

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avel

ling

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ster

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rect

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ast

App

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hed

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and

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ract

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ith

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rs

Dep

arte

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ed

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pped

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at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

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50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

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ark

(spe

cies

unkn

own)

O

bser

ved

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Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

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War

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unt

Stra

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Cap

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ogel

M

ilne

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Pro

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e09

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32+S

150

)05

45+E

No

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ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

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nB

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Poi

ntamp

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tC

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nort

hsi

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Miln

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)23

40+S

150

)59

28+E

Surf

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vide

otap

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H

eigh

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nkno

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Gro

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151

)54

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Hei

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39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

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09+S

151

)53

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M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 10: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

a sub-adult male one is a juvenile two arecalves and ve are unclassi ed into any age or sexgrouping

Matches were made for two animals One afemale with a calf was sighted (13 April 2002) andphotographed (Fig 4) east of Cape HuessenerKimbe Bay (05)0151+S150)1169+E sightingNo 33 Table 1) and photographed again two dayslater to the north of Kimbe Village (05)2937+S150)0874+E sighting No 34 Table 1) Theselocations are approximately 30 n mi apart A sub-adult male with a distinctive white mark on theright-side of the top of the dorsal n was photo-graphed in the Kimbe Bay region approximately 16months apart however exact date and location forthe resighting were not available (sighting No 21Table 1 and sighting No 34 Table 2)

Two individuals were observed (one in a photo-graph and the other in a videotapemdashsighting No 3and No 17 Table 1 respectively) to have light greyunder- ukes (Visser 2002b) in comparison to the

typical white under- ukes described as diagnosticfor the species (Heyning amp Dahlheim 1988)

Group size and compositionGroup size varied from one to approximately 20individuals with the group sizes of three (n=15)of two (n=11) of one (n=9) and of ve (n=6)reported most often Calves were noted 16 times(Tables 1 and 2) Adult males were not recorded inall groups (Tables 1 and 2) and four sub-adultmales were noted (Tables 1 and 2)

Foraging behaviour and interactions with othercetaceansKiller whales in Papua New Guinea waters havebeen observed foraging on four species of elasmo-branchs four records of scalloped-hammerheadshark (Sphyrna lewini) (sightings No 10 and No33 Table 1 and sightings No 19 and 20 Table 2)three records of grey reef shark (Carcharhinusamblyrhynchos) (sighting No 3 Table 1) two

Figure 1 Approximate locations of lsquolsquoCompletersquorsquo records of killer whale sightings in Papua New Guinea waters (extractedfrom Table 1)

159Killer whale sightings near Papua New Guinea

Tab

le2

lsquoDat

a-de

cie

ntrsquo

reco

rds

ofsi

ghti

ngs

ofki

ller

wha

les

inP

apua

New

Gui

nea

wat

ers

(exa

ctda

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loca

tion

not

know

n)

Dat

eamp

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e

Loc

atio

nL

atit

ude

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tude

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togr

aphs

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ideo

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Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

119

56ndash1

958

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tern

lati

tude

sne

arN

ewG

uine

aN

ewB

rita

in

and

Dol

ak

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

219

56ndash1

958

Dur

ing

July

toD

ecem

ber

Eas

tern

lati

tude

sne

arN

ewG

uine

aN

ewB

rita

in

and

Dol

ak

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stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngs

hoV

long

-lin

es(t

arge

tsp

ecie

sw

ere

tuna

)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

3Se

ptem

ber

1956

Nei

ghbo

urho

odof

15)S

toth

eso

uth

ofN

ewG

uine

aIs

land

15)1

587

+S1

54)1

857

+E

Not

stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

ngtu

naoV

long

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es

(Var

ious

spec

ies

oftu

nam

enti

oned

bu

tno

neid

enti

ed

spec

ica

lly)

lsquolsquoThe

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hern

limit

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pear

ance

ofO

rcin

usm

oved

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ene

ighb

ourh

ood

of15

)Sto

the

sout

hof

New

Gui

nea

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ptem

ber

1956

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hita

etal

19

63

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ecem

ber

1958

Nei

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19)S

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00+

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4)32

58+

E

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stat

edN

otst

ated

Rep

orts

ofki

ller

wha

les

taki

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long

-lin

es

(Var

ious

spec

ies

oftu

nam

enti

oned

bu

tno

neid

enti

ed

spec

ica

lly)

No

furt

her

deta

ilsst

ated

Iw

ashi

taet

al

1963

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rior

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64A

roun

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uine

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150

)51

359+

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stat

edN

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ated

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ing

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her

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964)

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ing

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em

aule

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lesrsquo

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ght

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)

160 I N Visser and F J Bonoccorso

Tab

le2

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tinu

ed

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e

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atio

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Ben

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pc

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June

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97+S

142

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95+E

Not

stat

edK

iller

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les

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il19

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this

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1991

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ter)

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mat

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pc

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1992

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161Killer whale sightings near Papua New Guinea

Tab

le2

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tinu

ed

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e

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nL

atit

ude

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adan

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stat

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neor

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epo

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ar

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Row

land

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pc

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ls

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ay

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tN

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land

05)0

942

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(1ca

lf)

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mm

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tere

dth

ew

ater

A

nony

mou

s(1

995)

20P

rior

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dof

1994

Kim

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tN

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edIn

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dual

sor

smal

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4)F

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mm

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Are

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ally

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hin

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ay

Kill

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ere

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ree

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sin

1994

A

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Shoa

lth

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med

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nga

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dy(1

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2119

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736

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pc

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stat

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neor

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pc

23N

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ber

1996

Nea

rIn

glis

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imbe

Bay

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est

New

Bri

tain

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nd05

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150

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phot

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phs

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ofu

rthe

rde

tails

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M

Ben

jam

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1996

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895

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phs

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tm

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low

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nd

M

Ben

jam

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pc

162 I N Visser and F J Bonoccorso

Tab

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uIs

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tain

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)25

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phs

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tN

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nce

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phs

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ved

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29A

pril

1988

Pan

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uIs

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chai

n10

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30+S

152

)37

73+E

2O

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eju

stou

tsid

eth

ela

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alon

gth

ere

ef

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dju

stch

ange

d

JK

inch

27

30N

ovem

ber

1999

Mw

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aB

each

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Isla

nd

Miln

eB

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nce

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ely

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d

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pc

3119

99N

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land

M

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Bay

Pro

vinc

e10

)15

42+S

150

)59

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No

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phs

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kille

rw

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me

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pc

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Bay

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)17

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)59

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phs

1C

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163Killer whale sightings near Papua New Guinea

Tab

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No

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phs

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erIs

land

02)4

007

+S1

50)2

789

+E

Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

ayfr

omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

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mal

e)T

his

adul

tm

ale

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mal

esi

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dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

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avel

ling

ina

sout

hea

ster

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rect

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gth

eco

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App

roac

hed

boat

and

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ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

Mal

esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 11: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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162 I N Visser and F J Bonoccorso

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win

gth

eco

ntou

rof

the

reef

nort

hwar

d

JL

inds

trom

30

pc

3119

99N

WN

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)15

42+S

150

)59

62+E

No

phot

ogra

phs

2T

wo

kille

rw

hale

sca

me

clos

ein

toth

edi

nghy

C

utth

een

gine

and

they

swam

oV

D

Mit

chel

l28

pc

3219

99N

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)17

30+S

150

)59

25+E

No

phot

ogra

phs

1C

ame

alon

gsid

eth

eve

ssel

then

swam

oVag

ain

D

Mit

chel

l28

pc

163Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

33P

rior

toM

ay20

00G

oshe

nSt

rait

E

ast

Cap

eN

ewG

uine

ato

Cap

eV

ente

nant

N

orm

anby

Isla

nd10

)12

43+S

150

)03

35+E

Not

stat

edlsquoF

requ

entl

ysi

ghte

drsquo

D

Mit

chel

l28

pc

34A

ugus

t20

00R

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

30+S

150

)06

05+E

Surf

ace

phot

ogra

phs

6(1

sub-

adul

tm

ale)

Sub-

adul

tm

ale

had

whi

tepa

tch

onri

ght-

hand

side

ofdo

rsal

n

M

John

son3

1p

c

35D

ecem

ber

2000

Rai

Coa

st

Said

or

Mad

ang

Pro

vinc

e05

)36

02+S

146

)26

31+E

No

phot

ogra

phs

4ndash5

Seen

kille

rw

hale

sse

vera

lti

mes

mov

ing

alon

gth

eco

ast

Inbo

aton

eda

yan

dw

assu

rrou

nded

byab

out

4or

5of

them

O

nesp

y-ho

pped

B

Lea

hy32

pc

3620

00C

ham

iso

Cha

nnel

N

ewH

anov

erIs

land

02)4

007

+S1

50)2

789

+E

Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

ayfr

omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

les

wer

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avel

ling

ina

sout

hea

ster

lydi

rect

ion

alon

gth

eco

ast

App

roac

hed

boat

and

inte

ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

Mal

esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 12: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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162 I N Visser and F J Bonoccorso

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163Killer whale sightings near Papua New Guinea

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ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

33P

rior

toM

ay20

00G

oshe

nSt

rait

E

ast

Cap

eN

ewG

uine

ato

Cap

eV

ente

nant

N

orm

anby

Isla

nd10

)12

43+S

150

)03

35+E

Not

stat

edlsquoF

requ

entl

ysi

ghte

drsquo

D

Mit

chel

l28

pc

34A

ugus

t20

00R

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)17

30+S

150

)06

05+E

Surf

ace

phot

ogra

phs

6(1

sub-

adul

tm

ale)

Sub-

adul

tm

ale

had

whi

tepa

tch

onri

ght-

hand

side

ofdo

rsal

n

M

John

son3

1p

c

35D

ecem

ber

2000

Rai

Coa

st

Said

or

Mad

ang

Pro

vinc

e05

)36

02+S

146

)26

31+E

No

phot

ogra

phs

4ndash5

Seen

kille

rw

hale

sse

vera

lti

mes

mov

ing

alon

gth

eco

ast

Inbo

aton

eda

yan

dw

assu

rrou

nded

byab

out

4or

5of

them

O

nesp

y-ho

pped

B

Lea

hy32

pc

3620

00C

ham

iso

Cha

nnel

N

ewH

anov

erIs

land

02)4

007

+S1

50)2

789

+E

Boa

tM

VF

eBri

naob

serv

eda

kille

rw

hale

give

birt

hth

eca

lfsw

imm

ing

wit

hit

sum

bilic

alco

rdst

illat

tach

ed

Kill

erw

hale

sigh

ting

sar

eco

mm

onat

leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

ban3

3p

c

38N

ovem

ber

2001

Bet

wee

nW

PR

an

dR

esto

rfIs

land

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

3C

lose

into

shor

e10

0sp

inne

rdo

lphi

nshi

gh-s

peed

porp

oisi

ngin

ano

rth

east

ern

dire

ctio

naw

ayfr

omki

ller

wha

les

M

Pri

or16

ampT

P

elus

o8p

c

3920

01B

etw

een

Egu

mat

oll

ampW

oodl

ark

Mad

auIs

land

M

ilne

Bay

Pro

vinc

e09

)06

30+S

152

)07

94+

No

phot

ogra

phs

2A

nim

als

wer

ehe

adin

gto

war

dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

4020

02B

etw

een

Boi

aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

Isla

nd

Nor

thof

Mad

ang

04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

42M

arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

fo

und

inde

epw

ater

B

Dis

ilale

34

pc

43A

pril

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

2C

ame

from

the

dire

ctio

nof

Cap

eV

ogel

B

D

isila

le34

pc

44U

nkno

wn

Rav

enC

hann

el

betw

een

Eas

tC

ape

ampN

uaka

taIs

land

M

ilne

Bay

10)1

500

+S1

50)5

605

+E

No

phot

ogra

phs

1H

eadi

ngto

war

dsN

orm

anby

Isla

nd

follo

win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

nkno

wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

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beth

esa

me

mal

esi

ghte

dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

dult

mal

e)T

his

adul

tm

ale

isth

ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

o8p

c

49U

nkno

wn

lsquoPin

nacl

esrsquo

15m

iles

sout

hea

stof

Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

ogra

phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

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avel

ling

ina

sout

hea

ster

lydi

rect

ion

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gth

eco

ast

App

roac

hed

boat

and

inte

ract

edw

ith

snor

kelle

rs

Dep

arte

dw

hen

scub

aus

ed

Mal

esp

y-ho

pped

next

tobo

at

K

Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

land

02)3

998

+S1

50)2

947

+E

Not

stat

edN

otst

ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

from

boat

Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

E

Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 13: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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win

gth

ecu

rren

t

B

Dis

ilale

34

pc

45U

nkno

wn

Star

Ree

fs

Lus

anca

yIs

land

sT

robr

iand

Isla

nds

08)1

951

+S1

48)5

699

+E

Und

erw

ater

vide

otap

eF

orag

ing

ona

man

tara

yO

bser

ved

from

boat

MV

FeB

rina

T

P

elus

o8p

c

46U

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wn

Bag

abag

Isla

nd

Mad

ang

Pro

vinc

e04

)49

93+S

146

)19

49+E

1(a

dult

mal

e)T

his

adul

tm

ale

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ough

tto

beth

esa

me

mal

esi

ghte

dat

Stet

tin

Bay

(rec

ord

No

47

this

tabl

e)

Dis

tanc

ebe

twee

nis

am

inim

umof

350

km

SR

itch

ie36

pc

47U

nkno

wn

Stet

tin

Bay

K

imbe

Bay

W

est

New

Bri

tain

Isla

nd05

)23

71+S

150

)08

28+E

1(a

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mal

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his

adul

tm

ale

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ough

tto

beth

esa

me

mal

esi

ghte

dat

Bag

abag

Isla

nd(r

ecor

dN

o46

th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

V

ideo

tape

Num

ber

ofan

imal

s(s

exa

ge)

For

agin

gbe

havi

our

Oth

erde

tails

Sour

ce

48U

nkno

wn

Kim

beB

ay

Wes

tN

ewB

rita

inIs

land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

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c

49U

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wn

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nacl

esrsquo

15m

iles

sout

hea

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Por

tM

ores

by09

)42

92+S

147

)24

05+E

Surf

ace

phot

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phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

les

wer

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avel

ling

ina

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ster

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rect

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ast

App

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hed

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and

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ract

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ith

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kelle

rs

Dep

arte

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hen

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ed

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y-ho

pped

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at

K

Bal

dwin

37

pc

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wn

Pla

net

Cha

nnel

N

ewH

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02)3

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947

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Not

stat

edN

otst

ated

For

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ark

(spe

cies

unkn

own)

O

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ved

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Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

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erIs

land

02)2

163

+15

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87+

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Not

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edN

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ated

Obs

erve

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iaE

amp

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Cap

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ilne

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150

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phs

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nally

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D

M

itch

ell2

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ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

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ooP

oint

M

ilne

Bay

10)2

731

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50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

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ntamp

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nort

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Miln

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)23

40+S

150

)59

28+E

Surf

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vide

otap

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H

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nkno

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151

)54

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Hei

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pc

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wn

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Tro

bria

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land

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09+S

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)53

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M

Hei

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39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 14: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

Tab

le2

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tinu

ed

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eamp

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e

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ber

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agin

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ce

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rior

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ast

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eM

ilne

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ltm

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agin

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orke

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hth

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ller

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dsth

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tit

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hen

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ough

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ean

ddr

oppe

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ain

He

did

this

seve

ral

tim

esbe

fore

swim

min

gaw

ay

lsquolsquoOrc

aar

ese

enre

gula

rly

atth

issi

tersquorsquo

Hal

stea

d(1

996)

27M

arch

1997

Wit

uIs

land

sW

est

New

Bri

tain

Pro

vinc

e04

)41

57+S

149

)25

76+E

Und

erw

ater

phot

ogra

phs

Not

stat

edF

orag

ing

ona

blue

-spo

tted

ray

Obs

erve

dfr

ombo

atM

VF

eBre

na

Gle

eson

(199

7)B

G

lees

on26

ampM

B

enja

min

1p

c28

Pri

orto

Apr

il19

98L

ama

Shoa

lW

itu

Isla

nds

Wes

tN

ewB

rita

inP

rovi

nce

04)4

310

+S1

49)3

288

+E

No

phot

ogra

phs

3O

bser

ved

from

boat

Sta

rD

ance

rE

nter

edw

ater

wit

hth

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imal

s

And

erso

n(1

998)

29A

pril

1988

Pan

asag

usag

uIs

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alva

dos

chai

n10

)58

30+S

152

)37

73+E

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nth

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tsid

eth

ela

goon

alon

gth

ere

ef

Tid

eha

dju

stch

ange

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JK

inch

27

30N

ovem

ber

1999

Mw

ataw

aB

each

K

iriw

ina

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nd

Miln

eB

ayP

rovi

nce

08)3

329

+S1

51)1

174

+E

App

roxi

mat

ely

10T

hegr

oup

appe

ared

atm

id-d

ay

follo

win

gth

eco

ntou

rof

the

reef

nort

hwar

d

JL

inds

trom

30

pc

3119

99N

WN

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)15

42+S

150

)59

62+E

No

phot

ogra

phs

2T

wo

kille

rw

hale

sca

me

clos

ein

toth

edi

nghy

C

utth

een

gine

and

they

swam

oV

D

Mit

chel

l28

pc

3219

99N

uaka

taIs

land

M

ilne

Bay

Pro

vinc

e10

)17

30+S

150

)59

25+E

No

phot

ogra

phs

1C

ame

alon

gsid

eth

eve

ssel

then

swam

oVag

ain

D

Mit

chel

l28

pc

163Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

aphs

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Num

ber

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ge)

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gbe

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our

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ce

33P

rior

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ay20

00G

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nSt

rait

E

ast

Cap

eN

ewG

uine

ato

Cap

eV

ente

nant

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orm

anby

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nd10

)12

43+S

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)03

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Not

stat

edlsquoF

requ

entl

ysi

ghte

drsquo

D

Mit

chel

l28

pc

34A

ugus

t20

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esto

rfIs

land

K

imbe

Bay

W

est

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Bri

tain

Isla

nd05

)17

30+S

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)06

05+E

Surf

ace

phot

ogra

phs

6(1

sub-

adul

tm

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Sub-

adul

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side

ofdo

rsal

n

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John

son3

1p

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35D

ecem

ber

2000

Rai

Coa

st

Said

or

Mad

ang

Pro

vinc

e05

)36

02+S

146

)26

31+E

No

phot

ogra

phs

4ndash5

Seen

kille

rw

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assu

rrou

nded

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out

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nesp

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Lea

hy32

pc

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ham

iso

Cha

nnel

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ewH

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erIs

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02)4

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Boa

tM

VF

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serv

eda

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give

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hth

eca

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imm

ing

wit

hit

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bilic

alco

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illat

tach

ed

Kill

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ting

sar

eco

mm

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leas

t2ndash

3ti

mes

aye

ar

Via

E

ampD

A

nom

13

pc

37M

arch

2001

Sout

hK

iller

ton

Isla

nd

Miln

eB

ay10

)21

23+S

150

)39

51+E

No

phot

ogra

phs

2(1

lsquobig

rsquo1

lsquosm

allrsquo)

Com

ing

into

the

bay

wit

hth

ecu

rren

tSe

enfr

oman

outr

igge

rca

noe

M

Lei

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38N

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ber

2001

Bet

wee

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an

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esto

rfIs

land

K

imbe

Bay

W

est

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Bri

tain

Isla

nd05

)21

82+S

150

)27

89+E

No

phot

ogra

phs

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lose

into

shor

e10

0sp

inne

rdo

lphi

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gh-s

peed

porp

oisi

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les

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Pri

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elus

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auIs

land

M

ilne

Bay

Pro

vinc

e09

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No

phot

ogra

phs

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nim

als

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dsG

awa

Seen

from

alo

cal

trad

ing

boat

Hiw

i

M

Lei

ban3

3p

c

164 I N Visser and F J Bonoccorso

Tab

le2

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tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

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togr

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phot

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phs

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35

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eV

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Cap

eV

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Eas

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ilne

Bay

10)1

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605

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No

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Isla

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P

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ord

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this

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e)

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pc

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Stet

tin

Bay

K

imbe

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W

est

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Bri

tain

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nd05

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his

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abag

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nd(r

ecor

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th

ista

ble)

D

ista

nce

betw

een

isa

min

imum

of35

0km

SR

itch

ie36

pc

165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

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Num

ber

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our

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tN

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263

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wha

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ater

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P

elus

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lsquoPin

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ith

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Dep

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dw

hen

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aus

ed

Mal

esp

y-ho

pped

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Bal

dwin

37

pc

50U

nkno

wn

Pla

net

Cha

nnel

N

ewH

anov

erIs

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02)3

998

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947

+E

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stat

edN

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ated

For

agin

gon

ash

ark

(spe

cies

unkn

own)

O

bser

ved

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Tia

ta

Via

Eamp

D

Ano

m13

pc

51U

nkno

wn

Big

Fis

hR

eef

NE

ofN

ewH

anov

erIs

land

02)2

163

+15

0)22

87+

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Not

stat

edN

otst

ated

Obs

erve

dfr

ombo

atT

iata

V

iaE

amp

D

Ano

m13

pc

52U

nkno

wn

War

dH

unt

Stra

it

Cap

eV

ogel

M

ilne

Bay

Pro

vinc

e09

)37

32+S

150

)05

45+E

No

phot

ogra

phs

Occ

asio

nally

seen

D

M

itch

ell2

8p

c

53U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

54U

nkno

wn

Wah

ooP

oint

M

ilne

Bay

10)2

731

+S1

50)4

658

+E

Not

stat

edN

otst

ated

No

furt

her

deta

ilsgi

ven

Rv

ande

rL

oos

38

pc

55U

nkno

wn

Bet

wee

nB

asal

isk

Poi

ntamp

Eas

tC

ape

nort

hsi

deof

Miln

eB

ay10

)23

40+S

150

)59

28+E

Surf

ace

vide

otap

eM

H

eigh

es39

pc

56U

nkno

wn

Mar

shal

Ben

nett

Gro

up

Tro

bria

ndIs

land

s08

)51

14+S

151

)54

86+E

M

Hei

ghes

39

pc

57U

nkno

wn

Egu

mA

toll

Tro

bria

ndIs

land

s09

)24

09+S

151

)53

90+E

M

Hei

ghes

39

pc

See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 15: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

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phs

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lsquobig

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lsquosm

allrsquo)

Com

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wit

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89+E

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phs

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lose

into

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rdo

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gh-s

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Pri

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Pro

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Seen

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164 I N Visser and F J Bonoccorso

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165Killer whale sightings near Papua New Guinea

Tab

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iller

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See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 16: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

Tab

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Con

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Dat

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Tim

e

Loc

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atit

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Num

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ge)

For

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4020

02B

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aboi

aW

aga

Isla

ndan

dE

ast

Cap

eM

ilne

Bay

10)1

298

+S1

50)5

388

+E

No

phot

ogra

phs

1Se

asw

ere

roug

h(w

ind

from

the

SEse

ctor

)sa

wth

ean

imal

inth

ele

eof

the

isla

nds

B

Dis

ilale

34

pc

41lsquoS

ome

year

sag

orsquoM

anum

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nd

Nor

thof

Mad

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04)0

371

5S

145)

065

15E

No

phot

ogra

phs

5(1

adul

tm

ale

1ca

lf)

Wit

hth

emfo

rov

er1

hC

de

Wit

35

pc

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arch

(yea

run

know

npr

ior

to20

02)

Eas

tC

ape

Miln

eB

ay10

)13

97+S

150

)52

83+E

No

phot

ogra

phs

1C

ame

from

the

dire

ctio

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Cap

eV

ogel

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Cap

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B

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(rec

ord

No

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this

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e)

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Stet

tin

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imbe

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est

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ble)

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imum

of35

0km

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itch

ie36

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165Killer whale sightings near Papua New Guinea

Tab

le2

Con

tinu

ed

Dat

eamp

Tim

e

Loc

atio

nL

atit

ude

ampL

ongi

tude

Pho

togr

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Num

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ce

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)K

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Obs

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10)2

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Hei

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See

Tab

le1

for

foot

note

s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 17: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

Tab

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Con

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ed

Dat

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Tim

e

Loc

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ude

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tude

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Num

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land

05)2

263

+S1

50)1

014

+E

2(1

calf

)K

iller

wha

lew

ith

ade

adca

lfob

serv

edun

derw

ater

T

P

elus

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49U

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wn

lsquoPin

nacl

esrsquo

15m

iles

sout

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Por

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ores

by09

)42

92+S

147

)24

05+E

Surf

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phot

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phs

lsquoFam

ilygr

ouprsquo

(1ad

ult

mal

e)K

iller

wha

les

wer

etr

avel

ling

ina

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ster

lydi

rect

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eco

ast

App

roac

hed

boat

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inte

ract

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ith

snor

kelle

rs

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arte

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hen

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net

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Tab

le1

for

foot

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s

166 I N Visser and F J Bonoccorso

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 18: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

records of manta ray (Manta birostris) (sightingNo 3 Table 1 sighting No 45 Table 2) and onerecord of blue-spotted ray (Aetobatus narinari)(sighting No 27 Table 2)

The earliest records of killer whales in PapuaNew Guinea waters describe the animals removing sh (tuna of various species) from long-lines(Iwashita et al 1963 Sivasubramaniam 1964) Anadditional two species of n- sh have been ident-i ed as free-swimming prey Indo-Paci c sail shIstiophorus platypterus (sighting No 12 Table 1)and sun sh Mola mola (sighting No 26 Table 2)

During the interaction between an estimated 20killer whales and 12 sperm whales (Physeter macro-cephalus) (sighting No 16 Table 1) anecdotalinformation suggested that the killer whales couldhave harassed the sperm whales in an attempt toattack them Subsequent to the two species separat-ing into their conspeci c groups the sperm whaleswere observed for approximately 20 min and theirbehaviour did not appear to change from when rst

encountered Divers entered the water and wereable to take underwater photographs The killerwhales were observed for approximately 20 minas they traveled at high speed in a tight group ina north east direction until contact was lost(T Peluso pers comm)

During two other killer whale encounters spin-ner dolphins (Stenella longirostris) were sightedporpoising at high speed In encounter sightingNo 38 (Table 2) a group of three killer whales wereobserved oV Restorf Island After following themfor a short period a group of approximately 100spinner dolphins were observed to move away fromthe vicinity porpoising at high speed The killerwhales were not observed to follow the dolphinsand were not resighted In the second encounter(sighting No 34 Table 1) a group of approxi-mately 50 spinner dolphins were observed toporpoise at high speed away from an areawhere killer whales were last sighted surfacingapproximately 30 min earlier

Figure 2 Approximate locations of lsquolsquoData-de cientrsquorsquo records of killer whale sightings in Papua New Guinea waters(extracted from Table 2)

167Killer whale sightings near Papua New Guinea

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 19: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

DiscussionAlthough typically considered a temperate to coldwater species killer whales have been reported fromtropical areas around the world (eg Dahlheimet al 1982) Sightings in tropical Oceania Indo-Paci c and South-east Asia although not commonare widespread (Table 3) In addition to thosesightings listed in Table 3 there are the records fromPapua New Guinea presented here (Tables 1 and 2)From these it is apparent that killer whales are notuncommon in Papua New Guinea waters Thepeople living around the coastline occasionally sightthem (Table 1 and 2) and call them in PidginEnglish black white bigpla dolphin (black andwhite big-fellow dolphin) The people living in the

southern islands call them Ulaulasi in the Tawalalanguage It is of note that local Papua New Guineapeople have names for this species in that they arefamiliar enough with them to warrant a speci cname (ie they do not just classify them as alsquogeneralrsquo dolphin) This is not the case in NewZealand were although the killer whales are verycoastal in their habits (Visser 1999a Visser2000b) the local Maori people have no names normyths or legends about them (Best 1982a Best1982b Grace 1907 Orbell 1995) The vernacularname lsquoorcarsquo is used in Papua New Guinea havingbeen introduced by the expatriate communitywhich is primarily from Australia and NewZealand

Figure 3 Killer whale sightings in Papua New Guinea plotted by month where known (n=52) Dataextracted from Tables 1 and 2

Figure 4 Female killer whale and calf (catalogue numbers PNG4 amp PNG5 respectively)Photographed oV Cape Huessener Kimbe Bay West New Britain Island Papua New Guinea15 April 2002 The eye-patch of the calf is clearly visible as is a notch at the anterior base of femalersquosdorsal n Both animals show the typical black and white pigmentation pattern of killer whales fromthis area Photo I N Visser

168 I N Visser and F J Bonoccorso

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 20: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

Although there were only 52 sightings in PapuaNew Guinea waters for which the month wasknown (Fig 3) it appears that killer whales can befound between March and December inclusiveIwashita et al (1963) commented that killer whaleswill stay in the same region (which included PapuaNew Guinea waters) for at least three months andbased on predation from long-lines they tend toremain in tropical waters throughout the year

Apparent peaks in sightings (or lack of sightings)recorded here may be due to observer bias andordata collection bias (eg weather conditions maynot be conducive to cetacean sightings during thelsquowetrsquo season of DecemberndashFebruary) Observer biasis likely to be a factor contributing to the highnumber of sightings in April eg a survey con-ducted during this month (Visser 2002) It is alsolikely to be a contributing factor to the high numberof sightings from the Kimbe Bay area (567 oflsquocon rmedrsquo sightings) This area is one of the fewplaces in Papua New Guinea where for many yearsdive boats have made daily trips more than venautical miles from base (M Benjamin perscomm)

Because there are only two matches within thecatalogue and both are within the same area ofKimbe Bay it is not possible to suggest any pat-terns of movement The two killer whales with greyunder- ukes were not the same animal (Visserunpublished data) and they were observed in dif-ferent locations (one oV Wuvulu Island and theother at Kimbe Bay) Therefore it is possible thatmore killer whales in Papua New Guinea watersmay have grey under- ukes and this may be anindicative pigmentation feature for this population(Visser 2002b) Further collection of photographsand comparison with catalogues from adjacentareas is encouraged

Although the primary food source for thispopulation of killer whales is unknown elasmo-

branchs form at least part of their prey with the rst documentation worldwide of killer whalesfeeding on scalloped-hammerhead sharks greyreef sharks and blue-spotted rays (Fertl et al1996)

There are records of killer whales feeding on rays(albeit diVerent species) from Brazil the GalaacutepagosIslands and New Zealand (Fertl et al 1996 Visser1999a) and although a population of killer whalesoV New Zealand has been recorded eating a widerange of elasmobranchs (n=8 species) (Visser1999a Visser 2000a Visser et al 2000) they havenot been recorded foraging on grey reef sharksscalloped-hammerhead sharks or manta raysHowever grey reef sharks are not found in thetemperate waters of the area and scalloped-hammerhead sharks and manta rays are not com-mon perhaps contributing to these species notrecorded as prey for New Zealand killer whalesThe only other records of killer whales feeding onmanta rays are from the Galaacutepagos Islands (Fertlet al 1996)

It is noteworthy that where detailed observationswere made all elasmobranchs were held upside-down (Table 1) In some instances the prey werestill alive while being carried or when subsequentlydropped New Zealand killer whales have beenobserved lsquo ippingrsquo live rays dorsoventrally (Visser2000b) and in all instances oV New Zealand whereelectric rays (Torpedo fairchildii) were observed asprey they were held dorsoventrally (Visser unpub-lished data) Elasmobranchs can be a high-risk prey(eg the death of a killer whale was attributedto a sting-ray spine (Duignan et al 2000) anddefences such as teeth and electrical charges arealso potentially lethal) It is possible given thatelasmobranchs can be induced to exhibit lsquotonicimmobilityrsquo (an unlearned response characterisedby a state of immobility which may last from lessthan a min to several h) (Henningson 1994) that

Table 3 Sightings of killer whales in tropical Oceania Indo-Paci c and South-east Asia (for Papua New Guinea sightingssee Tables 1 and 2)

Location Source

Borneo Beasley (1997) Rudolph (1997)Federated States of Yap Reeves (1999) B Acker (pers comm)Indonesia Barnes (1991) Hembree (1980) Rudolph (1997) Sivasubramaniam (1964)New Guinea Iwashita (1963)Malaysia Corkeren (1995)Naru Eldredge (1991)New Caledonia Das (1993) Garrigue and Greaves (2001)Palau Iwashita (1963)Solomon Islands Newbert (1995) Shimada (1995)Thailand Andersen (1999) Chantrapornsyl (1996)Tonga I N Visser (unpublished data)

169Killer whale sightings near Papua New Guinea

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 21: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

the killer whales invert them dorsoventrally torender them defenceless However this should beinterpreted with caution as a lack of response fromthe prey may be the result of injury and theposition the prey is held by the killer whales may bea consequence of prey shape

Killer whales have been reported taking sh oVlong-lines in many areas of the world (eg Visser2000a) and although tuna have been reported asprey oV Papua New Guinea this seems to bepredominately associated with removing them fromlong-lines (eg Iwashita 1963 Sivasubramaniam1964 Visser 2000a) Killer whales take sword- sh (Xiphias gladius) from long-lines in Brazilianwaters (della Rosa 1995 Secchi amp Vaske 1998)but the instance reported here of the killer whalesforaging on Indo-Paci c sail sh is the rst forthis prey species and also as a free-swimming preyTwo other records exist for killer whales foragingon sun sh both from the South Paci cmdashone oVNew Zealand (Visser 2001) and one oV the GreatBarrier Reef Australia (Gladstone 1988)

JeVerson et al (1991) recorded interactionsbetween killer whales and other marine mammalsand divided killer whale interactions with othermarine mammals into two types predatory andnon-predatoryThey reported most attacks on largewhales (eg sperm whales) were by groups of oneto ve killer whales which is well below the groupsize associated with the sperm whales in sightingNo 16 (Table 1) Although neither predatorybehaviour nor avoidance behaviour was observedacoustic harassment by either species cannot beruled-out as no hydrophone recordings were made

JeVerson et al (1991) did not list any predatoryinteractions between killer whales and spinnerdolphins and listed only one record of non-predatory behaviour where a single killer whalewhich had escaped captivity was seen associatingwith spinner dolphins oV Hawaii (Pryor 1973) Thegroup size (of both prey and predator) for the twoevents involving killer whales and spinner dolphinsin Papua New Guinea waters (sighting No 34Table 1 and sighting No 38 Table 2) could havein uenced the responses of the animals Group sizesof the killer whales recorded in these interactionswere ve and three respectively Although JeVersonet al (1991) recorded instances of harassment ofprey by small groups of killer whales ( 5) theysuggested that attacks on large herds of dolphins($ 10 prey) are most common by groups of 6ndash10killer whales

Based on JeVerson et al (1991) we classify thethree events presented here (involving killer whalessperm whales and spinner dolphins) as non-predatory because there was no apparent attemptsat predation by the killer whales (again acousticharassment cannot be ruled-out)

It is generally accepted that marine mammalsform an important part of the diet of some killerwhale populations (Baird 1994 Baird 2000 Bairdamp Dill 1995 Barrett-Lennard et al 1996 Ford ampEllis 1999 Visser 1999c) Although they have notbeen recorded as prey in Papua New Guinea it isunlikely that the dolphins would ee the vicinity ofkiller whales if they were not potential prey Flightresponses are considered to be lsquoexpensiversquo in termsof energy expenditure (Ydenberg 1986) but theyare an eVective predator avoidance strategy Itis likely as marine mammal research expands inPapua New Guinea cetaceans will be reported asprey for killer whales in these waters

Aragones et al (1997) suggested that preliminaryinvestigations for cetaceans in developing countriescould collect anecdotal information and use plat-forms of opportunity because resources are oftenlimited for starting such a project This protocolwas followed and the results presented in a prelimi-nary cetacean survey of Kimbe Bay (Visser 2002)and herein suggesting that a research project tar-geting killer whales is not only feasible but due tothe lack of robust information about the species inthis area urgent Due to the time constraints forplatforms of opportunity such as scuba-divingboats and the lack of precise data from anecdotalinformation we believe that a dedicated vessel withtrained observers would be most successful Such adedicated long-term project would provide scien-ti c information to assist government and non-government organisations in protecting theseanimals in Papua New Guinea where their status isunknown

AcknowledgmentsM amp C Benjamin of Walindi Plantation Resorthosted the Kimbe Bay Preliminary Cetacean Surveyand provided logistical support (including vesselscrew and fuel) without their kind support thisstudy would not have been possible T Pelusoassisted extensively with data collection and logis-tics Many people provided access to unpublishedreports of orca in Papua New Guinea and theirresponse is gratefully acknowledged D Eglitis ADutton S Ritchie the crew of Fe Brina and thelsquodive crewrsquo at Walindi were helpful beyond wordsJ Grove and W Zender of Zegrahm Expeditionsallowed research to be conducted during theirPapua New Guinea Expedition Thanks to BNickel who compiled the maps J Berghan PMunday J McDowell T JeVerson S Imberti andC Guinet provided helpful comments and reviewedthe manuscript

Literature CitedAndersen M amp Kinze C C (1999) Annotated checklist

and identi cation key to the whales dolphins and

170 I N Visser and F J Bonoccorso

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 22: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

porpoises (order Cetacea) of Thailand and adjacentwaters Natural History Bulletin of Siam Society 4727ndash62

Anonymous (1995) Walindi amp FeBrina NewsletterUnpublished Report Walindi Plantation Resort POBox 4 Kimbe Bay WNBP Papua New GuineaKimbe

Aragones L V JeVerson T A amp Marsh H(1997) Marine mammal survey techniques applicablein developing countries Asian Maine Biology 14 15ndash39

Baird R W (1994) Foraging behaviour and ecologyof transient killer whales (Orcinus orca) PhDDissertation Simon Fraser University BurnabyBritish Columbia Canada

Baird R W (2000) The killer whale Foraging specializa-tions and group hunting In Cetacean Societies FieldStudies of Dolphins and Whales J Mann R CConnor P L Tyack and H Whitehead (eds)pp 127ndash153 University of Chicago Press Chicago

Baird R W amp Dill L M (1995) Occurrence andbehaviour of transient killer whales Seasonal and pod-speci c variability foraging behaviour and preyhandling Canadian Journal of Zoology 73 1300ndash1311

Baird R W amp Stacey P J (1988) Variation in saddlepatch pigmentation in populations of killer whales(Orcinus orca) from British Columbia Alaska andWashington State Canadian Journal of Zoology 662582ndash2585

Barnes R H (1991) Indigenous whaling and porpoisehunting in Indonesia United Nations EnvironmentProgram Marine Mammal Technical Report UNEPReport Number 3 99ndash106

Barrett-Lennard L G Ford J K B amp Heise K A(1996) The mixed blessing of echolocation diVerencesin sonar use by sh-eating and mammal-eating killerwhales Animal Behavior 51 553ndash565

Beasley I amp JeVerson T A (1997) Marine Mammals ofBorneo A preliminary checklist Sarawak MuseumJournal LI (No 72 (New Series)) 193ndash216

Berghan J amp Visser I N (2000) Vertebral columnmalformations in New Zealand delphinids with areview of cases world-wide Aquatic Mammals 26 17ndash25

Best E (1982a) Maori Religion and Mythology Volume IGovernment Printer Dominion Museum Bulletin 11Wellington

Best E (1982b) Maori Religion amp Mythology Volume IIGovernment Printer Dominion Museum BulletinNo 11 Wellington

Bigg M (1982) An assessment of killer whale (Orcinusorca) stocks oV Vancouver Island British ColumbiaReport of the International Whaling Commission 32655ndash666

Bigg M A Olesiuk P F Ellis G M Ford J K Bamp Balcomb K C (1990) Social organization andgenealogy of resident killer whales (Orcinus orca) incoastal waters of British Columbia and WashingtonState Report of the International Whaling CommissionSpecial Issue 12 383ndash405

Chantrapornsyl S Andulyanukosol K amp Kittiwathana-wong K (1996) Records of cetaceans in ThailandPhuket Marine Biological Research Bulletin 61 39ndash63

Corkeren P (1995) Report on the trip to the easternMalaysian states of Sarawak and Sabah and to NegaraBrunei DarussalammdashApril May 1995 Unpublishedreport

Cousteau J-M amp Richards M (1989) Cousteaursquos PapuaNew Guinea Journey Harry N Abrams IncorporatedNew York

Czarny M (1994) A fax to Irv from Walindi DiveLog Australia September 6

Dahlheim M E Leatherwood S amp Perrin W F (1982)Distribution of killer whales in the warm temperate andtropical eastern Paci c Report of the InternationalWhaling Commission 32 647ndash653

dalla Rosa L (1995) Interactions with the longline shery and information on the feeding habits of thekiller whale Orcinus orca Linnaeus 1758 (CetaceaDelphinidae) in south and southeast Brazil MastersThesis University of Rio Grande Rio Grande

Das J P (1993) Estemation prelininaire concernantla presence de mammiferes marines en Nouvelle-Caledonie Unpublished Report 3 pp

Dawbin W H (1972) Dolphins and whales Encyclo-paedia of Papua and New Guinea P Ryan (ed)Melbourne University Press in association with theUniversity of Papua New Guinea Melbourne 270ndash276

Duignan P J Hunter J E B Visser I N Jones G Wamp Nutman A (2000) Stingray spines A potential causeof killer whale mortality in New Zealand AquaticMammals 26 143ndash147

Eldredge L G (1991) Annotated checklist of the marinemammals of Micronesia Micronesica 24 217ndash230

Fertl D Acevedo-Gutierrez A amp Darby F L (1996) Areport of killer whales (Orcinus orca) feeding on acarcharhinid shark in Costa Rica Marine MammalScience 12 606ndash611

Ford J K B amp Ellis G (1999) Transients Mammal-hunting killer whales University of British ColumbiaPress Vancouver

Ford J K B Ellis G M amp Balcomb K C (1994)Killer whales The natural history and genealogy ofOrcinus orca in British Columbia and Washington StateUniversity of British Columbia Press Vancouver

Garrigue C amp Greaves J (2001) Cetacean records forthe New Caledonian area (Southwest Paci c Ocean)Micronesica 34 27ndash33

Gladstone W (1988) Killer whale feeding observedunderwater Journal of Mammalogy 69 629ndash630

Gleeson B (1997) Explore the Bismark Sea Skin DiverJune 106ndash108

Grace A (1907) Folktales of the Maori Gordon amp GotchWellington p 257

Halstead B (1996) The Dive Sites of Papua New Guineandash Comprehensive Coverage of Diving and SnorkellingNew Holland (Publishers) Ltd London

Hammond P S Mizroch S A amp Donovan G P(1990) Individual recognition and the estimation ofcetacean population parameters International WhalingCommission Cambridge United Kingdom p 440

Hembree E D (1980) Biological aspects of the cetacean shery at Lamalera Lembata Unpublished FinalReport to WWF World Wide Fund for NatureSwitzerland

171Killer whale sightings near Papua New Guinea

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso

Page 23: New observations and a review of killer whale ( Orcinus ... · Aquatic Mammals2003,29.1,150–172 New observations and a review of killer whale (Orcinus orca)sightings in Papua New

Henningson A D (1994) Tonic immobility in 12 elasmo-branchs Use as an aid in captive husbandry ZooBiology 13 325ndash332

Heyning J E amp Dahlheim M E (1988) Orcinus orcaMammalian Species 304 1ndash9

IUCN (2000) Hilton-Taylor C (compiler) 2000IUCN Red List of Threatened Species Inter-national Union for the Conservation of Nature GlandSwitzerland and Cambridge United Kingdomxviii+61 pp

Iwashita M Motoo I amp Yukinobu I (1963) On thedistribution of Orcinus in the Northern and SouthernPaci c equatorial waters as observed from reports onOrcinus predation Original title (Japanese) Shachi noshokugai Hokoku ni yoru Taiheiyo Nan-Boku SekidoKaiiki no shachi no bunpu ni tsuite Tokai DaigakuSuisan Kenkyusho Hokoku Fisheries and MarineService (Canada) Translation Series No 3751 (1976) 124ndash30

JeVerson T A Stacey P J amp Baird R W (1991) Areview of killer whale interactions with other marinemammals Predation to co-existence Mammal Review21 151ndash180

Johnson J (1999) Close encounters of the Walindi kindSportdiving Magazine 74 44ndash48

Leatherwood S Balcomb K C Matkin C O ampEllis G (1984) Killer whales (Orcinus orca) of southernAlaska Results of eld research 1984 prelimi-nary report Report No 84ndash175 pp 59 HSWRITechnical Report San Diego CA Available fromHubbs-Sea World Research Institute 6295 Sea HarborDrive Orlando FL 32821ndash8043 USA

Munday P (1994) Kimbe Bay Rapid EcologicalAssessment Volume 7 Marine Mammals Unpub-lished report to The Nature Conservancy in associ-ation with Mahonia na Dari Conservation andResearch Centre PO Box 697 Kimbe West NewBritain Papua New Guinea

Newbert C (1995) Just when we thought things could notget any better Unpublished Newsletter RainbowSea Tours Florida United States of America (httpwwwrstourscom) 7 1ndash13

Orbell M (1995) The illustrated encyclopaedia ofMaori myth and legend Canterbury University PressChristchurch

Pryor K (1973) Behaviour and learning in porpoises andwhales Naturwissenschaften 60 412ndash420

Reeves R R Leatherwood S Stone G S amp EldredgeL G (1999) Marine mammals in the area served bythe South Paci c Regional Environment Programme(SPREP) South Paci c Regional EnvironmentProgramme and United Nations EnvironmentProgramme

Rudolph P Smeenk C amp Leatherwood S (1997)Preliminary checklist of Cetacea in the Indonesianarchipelago and adjacent waters Zoologische Verhan-delingen Leiden 312 1ndash48

Secchi E R amp Vaske T J (1998) Killer whale (Orcinusorca) sightings and depredation on tuna and sword shlongline catches in southern Brazil Aquatic Mammals24 117ndash122

Shimada H amp Pastene L A (1995) Report of a sightingsurvey oV the Solomon Islands with comments on

Brydersquos whale distribution Report of the InternationalWhaling Commission 45 413ndash418

Sivasubramaniam K (1964) Predation of tuna longlinecatches in the Indian Ocean by killer-whales andsharks Bulletin of Fisheries Research Station Ceylon17 221ndash236

Skinner G (1994) Orcas at Walindi Dive log AustraliaJuly

Tomich P Q (1969) Mammals in Hawaii BishopMuseum Press Honolulu Hawaii Honolulu

Visser I N (1998) Proli c body scars and collapsingdorsal ns on killer whales in New Zealand watersAquatic Mammals 24 71ndash81

Visser I N (1999a) Benthic foraging on stingrays bykiller whales (Orcinus orca) in New Zealand watersMarine Mammal Science 15 220ndash227

Visser I N (1999b) Propeller scars and known migrationof two orca (Orcinus orca) in New Zealand waters NewZealand Journal of Marine and Freshwater Research 33635ndash642

Visser I N (1999c) A summary of interactions betweenorca (Orcinus orca) and other cetaceans in NewZealand waters New Zealand Journal of NaturalScience 24 101ndash112

Visser I N (2000a) Killer whale (Orcinus orca) inter-actions with longlines sheries in New Zealand watersAquatic Mammals 26 241ndash252

Visser I N (2000b) Orca (Orcinus orca) in New Zealandwaters PhD Dissertation University of AucklandAuckland

Visser I N (2001) Foraging behaviour and diet of(Orcinus orca) in New Zealand waters Proceedings ofthe 14th biennial conference on the biology of marinemammals Vancouver Canada November 28ndashDecember 3 2001

Visser I N (2002a) Kimbe Bay Preliminary CetaceanSurvey Report Unpublished report submitted toWalindi Plantation Resort and Mahonia na DariConservation and Research Centre PO Box 4 KimbeWest New Britain Papua New Guinea

Visser I N (2002b) Pigmentation as an indicative featurefor populations of killer whales Proceedings of theOrca Symposium Niort France 23ndash28 September2002

Visser I N Fertl D Berghan J amp van Meurs R(2000) Killer whale (Orcinus orca) predation on ashort n mako shark (Isurus oxyrinchus) in NewZealand waters Aquatic Mammals 26 229ndash231

Visser I N amp Fertl D C (2000) Stranding resightingand boat strike of a killer whale (Orcinus orca) oV NewZealand Aquatic Mammals 26 232ndash240

Visser I N amp Maumlkelaumlinen P (2000) Variation in eyepatch shape of killer whales (Orcinus orca) in NewZealand waters Marine Mammal Science 16 459ndash469

Wright A (1980) An investigation of Japanese long-line tuna shing operations in the region of PapuaNew Guinea Research Bulletin G Yamamoto (ed)Papua New Guinea Government (Department ofPrimary Industry) Port Moresby (Papua New Guinea)pp 49

Ydenberg R C (1986) The economics of eeing frompredators Advances in the study of behaviour 16 229ndash249

172 I N Visser and F J Bonoccorso