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