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Warning signals and predator-prey coevolution.

Daniel W Franks1, Jason Noble

  • 1Biosystems Group, School of Computing, University of Leeds, Leeds LS2 9JT, UK. dwfranks@comp.leeds.ac.uk

Proceedings. Biological Sciences
|August 19, 2004
PubMed
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Predators evolved a bias for attacking cryptic prey, not conspicuous prey. This model does not predict warning signal evolution, suggesting other predator psychology factors are vital.

Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Theoretical Ecology

Background:

  • Evolution of warning signals often relies on predator psychology models.
  • Sherratt's model proposed predator-prey coevolution, with predators favoring cryptic prey.

Purpose of the Study:

  • Replicate Sherratt's model using individual-based simulations.
  • Investigate the evolution of prey conspicuousness and predator attack strategies.
  • Determine if the model predicts the evolution of warning signals.

Main Methods:

  • Individual-based simulation to replicate Sherratt's model.
  • Monte Carlo simulation for relative prey survivorship analysis.
  • Model extension with continuous predator attack strategies and evolving prey conspicuousness.

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Main Results:

  • Replication confirmed predators evolve a bias towards attacking cryptic prey.
  • Cryptic prey consistently showed higher survivorship than conspicuous prey.
  • Evolving prey conspicuousness led to rapid evolution towards crypsis, even with runaway coevolution.

Conclusions:

  • The current model, while showing predator bias to crypsis, does not predict warning signal evolution.
  • Predator psychology beyond innate responses is crucial for understanding warning signals.
  • Further research is needed to incorporate additional psychological factors in evolutionary models.