invertebrate predators

21
Invertebrate Predators L. Madin, E. Horgan, B. Sullivan, S. Bollens GLOBEC Georges Bank Science Meeting Nov. 19, 2003

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Invertebrate Predators. L. Madin, E. Horgan, B. Sullivan, S. Bollens GLOBEC Georges Bank Science Meeting Nov. 19, 2003. Predation Mortality Calculation. Plot abundance maps per predator, depth, month, year. 5 standard regions, 3 depth ranges Add distribution of prey - PowerPoint PPT Presentation

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Page 1: Invertebrate Predators

Invertebrate Predators

L. Madin, E. Horgan, B. Sullivan, S. Bollens

GLOBEC Georges Bank Science Meeting

Nov. 19, 2003

Page 2: Invertebrate Predators

Large Predator Species (MOC 10)

AbundanceRank

Predator species Prey species Feeding Data

1 Pleurobrachia pileus Copepod, fishlarvae

Rates on copepods from gut contents (GLOBEC data), Fand T responses (literature data)

2 Neomysis americana Copepods F response on copepods (literature data)

3 Themisto gaudichaudii Nauplii,copepods

Rates on copepods, nauplii from gut contents (GLOBECdata), F,T responses (literature data)

4 Meganyctiphanesnorvegica

Copepods Rates on Calanus, Pcal. (GLOBEC and literature data)

5 Aglantha digitale Copepods Literature data

6Euphausii krohnii

CopepodsFish larvae

Estimate from other species (literature data)

7 Crangon septemspinosa Copepods Rates on Calanus, (GLOBEC and literature data)8 Sagitta spp. Copepods F, T responses on copepods (literature data)

9 Clupea harengus Copepods,larval fish

Rates on copepods, fish larvae from gut contents (COP-GLOBEC data),

10 Cirolana polita Nauplii GLOBEC feeding experiments

Page 3: Invertebrate Predators

Small Predator Species (MOC 1)

Predator species Prey species Feeding Data Clytia hydroids Nauplii,

copepods, fish larvae

F, T responses, selectivity on copepod eggs & nauplii, rates on cod larvae (GLOBEC data)

Clytia medusae Nauplii Lab feeding rates (Sell unpubl.) Obelia medusae Nauplii Lab feeding rates (Sell unpubl.) Centropages spp Nauplii F, T responses, selectivity on nauplii

(Sell et al.) Temora longicornis Nauplii

F, T responses, selectivity on nauplii (Sell et al.)

Metridia lucens Nauplii F, T respon ses, selectivity on nauplii (Sell et al.)

Calanus finmarchicus

Nauplii Literature data?

Themisto gaudichaudii

Nauplii, copepods

Rates on copepods, nauplii from gut contents (GLOBEC data), F,T responses (literature data)

Page 4: Invertebrate Predators

Inadequately Sampled Predator Species

Predator species Prey species Feeding Data Cyanea capillata

Copepods, fish eggs Rates, selectivity on copepods (literature data)

Nanomia cara

Copepods Rates on copepods from gut contents (literature data)

Bolinopsis infundibulum

Copepods, Fish larvae

Rates on copepods from gut contents (GLOBEC data)

Scomber scombrus

Copepods, larval fish

Rates on copepods, fish larvae from gut contents (COP-GLOBEC data),

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Predation Mortality Calculation

 1. Plot abundance maps per predator, depth, month, year.2. 5 standard regions, 3 depth ranges3. Add distribution of prey4. Predator abundance x feeding rate = Predation Capacity for

each station5.  Adjust Predation Capacity for temperature effect & prey

selection to models6. Divide Predation Capacity by target prey abundance for

Instantaneous Mortality7. Sum Instantaneous Mortality values for all co-occurring

predators = total predation impact per prey species

Page 20: Invertebrate Predators
Page 21: Invertebrate Predators

Estimates of Predation MortalityMay, 1995

Predator/prey Station Prey m-2 % Calanus

Predators m-2

Prey eaten m-2

d-1

Calanus eaten m-1

d-1

% Calanus stock eaten

d-1

Hydroids on nauplii

4 144434 14 154731 38682 5415 30

0.25/pred/day 12 23397 3 304946 76236 2287 303

20 86104 5 50767 12692 635 15

Pleurobrachia on copepodites

4 97040 15 5370 144990 2174 18

27/pred/day 12 47377 6 11 297 18 1

20 137550 14 288 7776 1088 7