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

5. PLB by years

6. PLB by months

7. PLB by month 1999

8. Neomysis americana by month 1996

9. Neomysis americana by month 1998

10. Neomysis americana by month 1999

11. Themisto gaudichaudii by month 1995-1999

12. Themisto gaudichaudii by years 1995-1999

13. Meganyctiphanes norvegica by month, all samples 1995-1999

14. Euphausia krohnii

15. Crangon septemspinosa

16. Clupea harengus plotted by years 1995-1999

17. Clupea harengus 1997

18. Clupea harengus 1998

19. Predation Mortality Calculation
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

21. Estimates of Predation Mortality May, 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
97040
5370
144990
2174 18
27/pred/day
47377 6 11
297 1
137550
288
7776
1088 7