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Related Experiment Video

Updated: May 11, 2026

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
10:50

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Visual predators select for crypticity and polymorphism in virtual prey.

Alan B Bond1, Alan C Kamil

  • 1Nebraska Behavioral Biology Group, School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0118, USA.

Nature
|February 8, 2002
PubMed
Summary
This summary is machine-generated.

Predators attacking common prey variants more often drives prey to evolve better camouflage and greater pattern diversity. This frequency-dependent predation was tested using digital moths and blue jays.

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Predator-Prey Dynamics

Background:

  • Phenotypic diversity in cryptic animals is common.
  • Frequency-dependent predation, where common variants are attacked more, may promote this diversity.
  • This hypothesis lacked direct experimental evidence.

Purpose of the Study:

  • To experimentally test the role of frequency-dependent predation in driving prey crypsis and phenotypic variance.
  • To investigate predator search strategies and their impact on prey evolution.

Main Methods:

  • A controlled experiment using digital moths presented on computer monitors to blue jays (Cyanocitta cristata).
  • Moth phenotypes evolved via a genetic algorithm, with selection against detected individuals.
  • Comparison of evolved moth populations under frequency-dependent selection versus control groups.

Main Results:

  • Blue jays exhibited frequency-dependent predation, failing to detect rare moth variants.
  • This led to moths evolving increased crypsis (difficulty in detection).
  • Evolved moth populations showed significantly greater phenotypic variance compared to controls.

Conclusions:

  • Frequency-dependent predation is a significant driver of prey crypsis and phenotypic diversity.
  • Predators likely use 'searching images' that favor common prey, inadvertently promoting rare variants.
  • This mechanism can explain the maintenance of diverse cryptic patterns in natural populations.