Download Invertebrate Predators

Invertebrate Predators
L. Madin, E. Horgan, B. Sullivan,
S. Bollens
GLOBEC Georges Bank Science Meeting
Nov. 19, 2003
Large Predator Species (MOC 10)
Abundance Predator species
Rank
1
Pleurobrachia pileus
Prey species
Feeding Data
Copepod, fish
larvae
Copepods
Rates on copepods from gut contents (GLOBEC data), F
and T responses (literature data)
F response on copepods (literature data)
Nauplii,
copepods
Copepods
Rates on copepods, nauplii from gut contents (GLOBEC
data), F,T responses (literature data)
Rates on Calanus, Pcal. (GLOBEC and literature data)
2
Neomysis americana
3
Themisto gaudichaudii
4
Meganyctiphanes
norvegica
5
Aglantha digitale
Copepods
Literature data
Copepods
Fish larvae
Estimate from other species (literature data)
Euphausii krohnii
6
7
8
Crangon septemspinosa Copepods
Sagitta spp.
Copepods
Rates on Calanus, (GLOBEC and literature data)
F, T responses on copepods (literature data)
9
Clupea harengus
10
Cirolana polita
Rates on copepods, fish larvae from gut contents (COPGLOBEC data),
GLOBEC feeding experiments
Copepods,
larval fish
Nauplii
Small Predator Species (MOC 1)
Predator species
Clytia hydroids
Clytia medusae
Obelia medusae
Centropages spp
Prey species
Nauplii,
copepods, fish
larvae
Nauplii
Nauplii
Nauplii
Temora longicornis
Nauplii
Metridia lucens
Nauplii
Calanus
finmarchicus
Themisto
gaudichaudii
Nauplii
Nauplii,
copepods
Feeding Data
F, T responses, selectivity on
copepod eggs & nauplii, rates on cod
larvae (GLOBEC data)
Lab feeding rates (Sell unpubl.)
Lab feeding rates (Sell unpubl.)
F, T responses, selectivity on nauplii
(Sell et al.)
F, T responses, selectivity on nauplii
(Sell et al.)
F, T responses, selectivity on nauplii
(Sell et al.)
Literature data?
Rates on copepods, nauplii from gut
contents (GLOBEC data), F,T
responses (literature data)
Inadequately Sampled Predator Species
Predator species
Cyanea capillata
Prey species
Feeding Data
Copepods, fish eggs Rates, selectivity on copepods (literature data)
Nanomia cara
Copepods
Bolinopsis infundibulum
Copepods,
Fish larvae
Copepods,
larval fish
Scomber scombrus
Rates on copepods from gut contents (literature
data)
Rates on copepods from gut contents
(GLOBEC data)
Rates on copepods, fish larvae from gut
contents (COP-GLOBEC data),
Predation Mortality Calculation
1.
2.
3.
4.
5.
6.
7.
Plot abundance maps per predator, depth, month, year.
5 standard regions, 3 depth ranges
Add distribution of prey
Predator abundance x feeding rate = Predation Capacity for
each station
Adjust Predation Capacity for temperature effect & prey
selection  to models
Divide Predation Capacity by target prey abundance for
Instantaneous Mortality
Sum Instantaneous Mortality values for all co-occurring
predators = total predation impact per prey species
Estimates of Predation Mortality
May, 1995
Station
Prey m-2
%
Calanus
Predators
m-2
Prey
eaten m-2
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
4
97040
15
5370
144990
2174
18
12
47377
6
11
297
18
1
20
137550
14
288
7776
1088
7
Predator/prey
Pleurobrachia
on
copepodites
27/pred/day
Calanus
eaten m-1
d-1
% Calanus
stock eaten
d-1