Running the gauntlet: a predator–prey game between sharks and two age classes of seals

We present both an empirical study and a behavioural game model exploring a predator–prey game between white sharks, Carcharodon carcharias, and Cape fur seals, Arctocephalus pusillus pusillus, around a small island colony in South Africa. Behavioural tactics used by adult seals appear to account fo...

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Bibliographic Details
Published in:Animal behaviour 2008-12, Vol.76 (6), p.1901-1917
Main Authors: Laroche, R. Karl, Kock, Alison A., Dill, Lawrence M., Oosthuizen, W. Herman
Format: Article
Language:English
Subjects:
Animal behavior
Animal ethology
Arctocephalus pusillus pusillus
behaviourally mediated indirect interaction (BMII)
Biological and medical sciences
Cape fur seal
Carcharodon carcharias
dynamic programming
Food chains
Fundamental and applied biological sciences. Psychology
game theory
Marine
Marine mammals
Predation
predator-prey
Psychology. Psychoanalysis. Psychiatry
Sharks
South Africa
white shark
Zoology
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Summary:We present both an empirical study and a behavioural game model exploring a predator–prey game between white sharks, Carcharodon carcharias, and Cape fur seals, Arctocephalus pusillus pusillus, around a small island colony in South Africa. Behavioural tactics used by adult seals appear to account for the variance in risk from sharks, while shark tactics seem more influenced by the behaviour of pup seals, probably because pup seals engage in riskier behaviours. A dynamic game model of the interaction predicts that, if pups and adult seals account for risk in a similar manner, then tactic selection used by sharks and seals should be more evenly distributed across all possible options. Instead, a second model in which pups were constrained to choose the riskiest option produced evolutionarily stable strategy (ESS) solutions for both species that more closely approximated the tactics recorded, suggesting that behavioural variation within subgroups of a population should be accounted for when modelling predator–prey interactions. These results also suggest that pups may act as initiators in a behaviourally mediated indirect interaction with adult seals, mediated by the behaviour of their common shark predator; this would represent the first record of an intergenerational two-species indirect interaction.
ISSN:0003-3472
1095-8282
DOI:10.1016/j.anbehav.2008.06.025