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Optimal apostatic selection: how should predators adjust to variation in prey frequencies?
Stockholm University, Faculty of Science, Department of Zoology.
2009 (English)In: Animal Behaviour, ISSN 0003-3472, E-ISSN 1095-8282, Vol. 77, no 1, 239-245 p.Article in journal (Refereed) Published
Abstract [en]

Although frequency-dependent predation or apostatic selection has been established as one of the phenomena that may promote prey diversity, little is known about its selection. We studied such selection with a model with two prey types, treating frequency-dependent predator behaviour as an evolving trait determined by two parameters. One parameter controlled change in both prey type detection probabilities as a consequence of detecting a prey individual of a given type, and the other controlled the maximal amount of bias in detection probabilities of the two prey types. We let frequency-dependent behaviour evolve under different conditions of prey frequency variation. We found that frequency-dependent predator behaviour was most beneficial when deviations from equal prey type frequencies were large. Furthermore, different patterns of prey type variation selected for different types of frequency-dependent predator behaviour. We conclude that optimal frequency-dependent predator behaviour is likely to vary with ecological conditions.

Place, publisher, year, edition, pages
2009. Vol. 77, no 1, 239-245 p.
Keyword [en]
crypsis; diversity; frequency-dependent selection, polymorphism, predation, search image, switching
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Research subject
URN: urn:nbn:se:su:diva-28305DOI: 10.1016/j.anbehav.2008.09.032ISI: 000261756700033OAI: diva2:223535
Available from: 2009-06-12 Created: 2009-06-12 Last updated: 2011-10-25Bibliographically approved

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Merilaita, Sami
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