Linking predator foraging behaviour and diet with variability in continental shelf ecosystems: grey seals of eastern Canada

2009 ◽  
pp. 63-81 ◽  
Author(s):  
W. D. Bowen ◽  
C. A. Beck ◽  
S. J. Iverson ◽  
D. Austin ◽  
J. I. MCMillan ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Foraging Behaviour ◽  
Eastern Canada ◽  
Predator Foraging

scholarly journals Large-scale climatic anomalies affect marine predator foraging behaviour and demography

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Charles A. Bost ◽  
Cedric Cotté ◽  
Pascal Terray ◽  
Christophe Barbraud ◽  
Cécile Bon ◽  
...  
Keyword(s):  
Large Scale ◽  
Foraging Behaviour ◽  
Marine Predator ◽  
Predator Foraging

Subtropical pupping ground for a cold-water shark

2010 ◽  
Vol 67 (5) ◽  
pp. 769-773 ◽  
Author(s):  
Steven E. Campana ◽  
Warren Joyce ◽  
Mark Fowler
Keyword(s):  
Life History ◽  
Continental Shelf ◽  
Gulf Stream ◽  
Cold Water ◽  
Mature Female ◽  
Life History Stage ◽  
Sargasso Sea ◽  
Eastern Canada ◽  
Northern And Southern Hemispheres ◽  
Conservation And Management

Porbeagle sharks ( Lamna nasus ) are large pelagic sharks apparently restricted to the cold temperate waters of the northern and southern hemispheres. Despite considerable knowledge of their biology, their pupping (birthing) grounds have never been identified. Pop-up archival transmission tags applied to 21 sharks off eastern Canada indicated that males and immature sharks of both sexes remained primarily on the continental shelf for periods of up to 348 days after tagging. However, mature female porbeagles migrated up to 2356 km through the winter, at depths down to 1360 m beneath the Gulf Stream, to a subtropical pupping ground in the Sargasso Sea. In addition to this pupping ground being well south of their documented range, the placement of such a key life history stage in international, largely unregulated waters poses problems for the conservation and management of a species that is largely fished in Canadian waters.

scholarly journals Optimal foraging for specific nutrients in predatory beetles

2012 ◽  
Vol 279 (1736) ◽  
pp. 2212-2218 ◽  
Author(s):  
Kim Jensen ◽  
David Mayntz ◽  
Søren Toft ◽  
Fiona J. Clissold ◽  
John Hunt ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Lipid Composition ◽  
Optimal Foraging ◽  
Egg Production ◽  
Foraging Behaviour ◽  
Ground Beetles ◽  
Ecological Communities ◽  
Selective Foraging ◽  
Anchomenus Dorsalis ◽  
Predator Foraging

Evolutionary theory predicts that animals should forage to maximize their fitness, which in predators is traditionally assumed equivalent to maximizing energy intake rather than balancing the intake of specific nutrients. We restricted female predatory ground beetles ( Anchomenus dorsalis ) to one of a range of diets varying in lipid and protein content, and showed that total egg production peaked at a target intake of both nutrients. Other beetles given a choice to feed from two diets differing only in protein and lipid composition selectively ingested nutrient combinations at this target intake. When restricted to nutritionally imbalanced diets, beetles balanced the over- and under-ingestion of lipid and protein around a nutrient composition that maximized egg production under those constrained circumstances. Selective foraging for specific nutrients in this predator thus maximizes its reproductive performance. Our findings have implications for predator foraging behaviour and in the structuring of ecological communities.

Variation in predator foraging behaviour changes predator-prey spatio-temporal dynamics

2011 ◽  
Vol 25 (6) ◽  
pp. 1309-1317 ◽  
Author(s):  
Punya Nachappa ◽  
David C. Margolies ◽  
James R. Nechols ◽  
James F. Campbell
Keyword(s):  
Foraging Behaviour ◽  
Temporal Dynamics ◽  
Predator Prey ◽  
Spatio Temporal ◽  
Predator Foraging ◽  
Behaviour Changes

scholarly journals Modelled mid‐trophic pelagic prey fields improve understanding of marine predator foraging behaviour

Ecography ◽  
2020 ◽  
Vol 43 (7) ◽  
pp. 1014-1026
Author(s):  
D. B. Green ◽  
S. Bestley ◽  
R. Trebilco ◽  
S. P. Corney ◽  
P. Lehodey ◽  
...  
Keyword(s):  
Foraging Behaviour ◽  
Marine Predator ◽  
Pelagic Prey ◽  
Predator Foraging
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