iucn red list categories and criteria examples. the iucn categories a. declining population b....

IUCN Red List Categories and Criteria Examples

THE IUCN CATEGORIES

Extinct (EX)

Extinct in the Wild (EW)

Critically Endangered (CR)

Endangered (EN)

Vulnerable (VU)

Near Threatened (NT)

Least Concern (LC)

Data Deficient (DD)

Not Evaluated (NE)

(Adequate data)

(Evaluated)

(Threatened)

A. Declining Population B. Small Distribution and

Decline or Fluctuation C. Small Population Size

and Decline D. Very Small or

Restricted E. Quantitative Analysis

Ancistrocladus robertsoniorum

J. Léonard

Case study 1

Family: Ancistrocladaceae

Common Name: unknown

Distribution: Kenya - K7

(Kwale District)

• Liana growing up to 30 m and found in moist, semi-

deciduous, lowland forest.

• The population is restricted to 3 locations, all within national

and forest reserves, and has an area of occupancy less than

500 km2. Extent of occurrence is unknown.

• This species is locally common, although the total number of

mature individuals within the population is unknown.

• The plant is not harvested despite being thought to have

some insecticidal properties.

• Habitat is legally protected, although this protection is not

enforced - the main threat to the species is habitat

degradation caused by increasing human demand for land for

cultivation. Frequent fires during dry seasons may also be a

threat to this species.

Questions

• Is there enough information to assess the species?

• Is it Extinct or Extinct in the Wild?

• Does the plant qualify for any of the categories of threat?

Case study 1

Yes

No

• A. Declining Population

• B. Small Distribution and Decline or Fluctuation

• C. Small Population Size and Decline

• D. Very Small or Restricted

• E. Quantitative Analysis

IUCN CriteriaCase study 1

B. Small Distribution

Extent of occurrence less than 100 km2

Extent of occurrenceless than 5000 km2

Extent of occurrenceless than 20 000 km2

Or

OrOr

Area of occupancyless than 10 km2

Area of occupancyless than 500 Km2


Critically Endangered Endangered Vulnerable

Case study 1





Or

OrOr





Case study 1

B. Criterion

Small Distribution

Severely fragmentedor few locations

Extreme fluctuation

Continuing Decline

Case study 1

B2. Small Area of Occupancy


Endangered B2ab(iii)

Case study 1

Final Listing: Ancistrocladus robertsoniorum J. Léonard

Endangered B2ab(iii)

Case study 1


• Severely fragmented (< 5 locations)

• Continuing decline in area, extent and quality of habitat

Ficus faulknerianaC.C. Berg

Case study 2

Family: Moraceae

Common Name: Mkuyu (Usamba) Mvumo (Swahili)

Distribution: Kenya, Tanzania - K7 (Kwale district), T3 (Pangani, Korogwe)

• An epiphytic/strangler tree found growing in coastal scrub and

wet forest areas.

• The fragmented population was known to occur at 4 locations,

with an additional site where one collection was made in 1968.

• Only 3 locations are now known and the extent of occurrence is

estimated at less than 20,000 km2 with a total area of occupancy

less than 10 km2.

•Ongoing loss of habitat and fragmentation are reported as the

main threats to the population which currently has less 50 mature

individuals (only 4 recorded in Dzirihini and Gongoni Forest

Reserve, Kenya).

• Habitat is highly degraded with danger of complete clearance.

Population decline attributed to habitat degradation.

Questions


• Is it Extinct or Extinct in the Wild? • Does the plant qualify for any of

the categories of threat?

Case study 2

- Yes

- No





Or

OrOr





Case study 2

B. Criterion

Small Distribution


Extreme fluctuation

Continuing Decline

Case study 2

Red Listing

Critically EndangeredB2ab(ii,iii,iv,v)

Case study 2


• Severely fragmented• Continuing decline in: area of

occupancy; area, extent and quality of habitat; number of locations or subpopulations; number of mature individuals

C. Criterion Population Figures

Critically Endangered <250

Endangered <2 500

Vulnerable <10 000

Case study 2

C. Criterion

Small Population

Continuing decline of at least 25% within 3 years or 1 generation

Case study 2

Continuing declinein numbers of mature individuals & at least one of a or b ….

C. Criterion

Small Population

Case study 2

Continuing declinein numbers of mature individuals & at least one of a or b ….

Continuing decline of at least 25% within 3 years or 1 generation

C2. Continuing decline and one of a or b

C2a Population structure in form of: (i) no subpopulation > 50 mature individuals OR

(ii) 90% in one subpopulation

Case study 2

C2b Extreme fluctuations in numbers of mature individuals

OR


Critically Endangered

C2a(i)

Case study 2

Case study 2

D. Criterion

Critically Endangered 50

Endangered 250

Vulnerable D1 1000 D2 acute restriction in area of occupancy or in the number of locations



D

Case study 2

Final Listing:Ficus faulkneriana C.C. Berg


B2ab(i,ii,iii,iv,v); C2a(i); D

Case study 2

Ziziphus robertsonianaBeentje

Case study 3

Family: Rhamnaceae

Common Name: unknown

Distribution: Kenya, Tanzania - K7 (Kwale district), T3

• A tree (6-16 m tall) growing in moist, semi-deciduous lowland forest.

• Extent of occurrence is recorded as less than 1,000 km2.

• The species is known to exist in 5 locations in Kenya. The Tanzanian population is unknown.

• Information on the number of mature trees in the population is largely anecdotal: it is thought that a large proportion of the population is juvenile with very few reproducing adults present.

• All the Kenyan locations are subject to ongoing encroachment and their long-term security remains unknown. The status of the Tanzanian sites is unknown.

• Main threats to this species are ongoing loss and degradation of forest areas, and competition from invasive plant species.

Questions


• Is it Extinct or Extinct in the Wild? • Does the plant qualify for any of

the categories of threat?

Case study 3

- Yes

- No





Or

OrOr





Case study 3

B. criterion

Small Distribution


Extreme fluctuation

Continuing Decline

Case study 3

Red Listing Endangered

B1ab(i,ii,iii,iv,v)

Case study 3

Extent of occurrenceless than 5000 Km2

• Severely fragmented (< 5 locations)

• Continuing decline in: extent of occurrence; area of occupancy; area, extent and quality of habitat; number of locations or subpopulations; number of mature individuals

Final Listing: Ziziphus robertsoniana Beentje

Endangered B1ab(i,ii,iii,iv,v)

Case study 3

WORKING GROUPS SESSION

iucn red list categories and criteria examples. the iucn categories a. declining population b....

Documents

decline case study

small population size

criterion small distribution

lonard case study

berg case study

quantitative analysis

declining population

quality of habitat slide