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Evolutionary consequences of a search image

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  • van Leeuwen, E.
  • Jansen, V.A.A.

Abstract

Many predators are able to become better at spotting cryptic prey by recognising specific clues, but by concentrating on one prey type they will become worse at spotting other prey types. This phenomenon is known as the formation of a search image for a certain prey by a predator and is related to apostatic selection. Here, we study the evolution of a search image in the predator by formulating and analysing a mathematical model. The predator forages for two prey types and is able to form an independent search image for both prey. The results show that the evolutionary dynamics can be divided into two parts: a fast and a slow part. At first selection pressure will be strong towards a stable ratio of prey, which is the same as the ratio found for the unbeatable prey choice for predators with a Holling type II functional response. Following this, the slow dynamics will keep this ratio constant independent of the trait values, but the predator will slowly evolve towards a stronger search image and ultimately become a specialist predator or slowly evolve towards generalist with a weak search image. In conclusion, the formation of a search image causes the predator to control the prey densities such that the ratio of available prey is kept constant by the predator.

Suggested Citation

  • van Leeuwen, E. & Jansen, V.A.A., 2010. "Evolutionary consequences of a search image," Theoretical Population Biology, Elsevier, vol. 77(1), pages 49-55.
    • Handle: RePEc:eee:thpobi:v:77:y:2010:i:1:p:49-55
    DOI: 10.1016/j.tpb.2009.11.001
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    References listed on IDEAS

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    1. Křivan, Vlastimil & Cressman, Ross & Schneider, Candace, 2008. "The ideal free distribution: A review and synthesis of the game-theoretic perspective," Theoretical Population Biology, Elsevier, vol. 73(3), pages 403-425.
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    3. Alan B. Bond & Alan C. Kamil, 2002. "Visual predators select for crypticity and polymorphism in virtual prey," Nature, Nature, vol. 415(6872), pages 609-613, February.
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