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Related Experiment Videos

Predator-driven phenotypic diversification in Gambusia affinis.

R Brian Langerhans1, Craig A Layman, A Mona Shokrollahi

  • 1Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, Texas 77843-2258, USA. langerhans@wustl.edu

Evolution; International Journal of Organic Evolution
|November 26, 2004
PubMed
Summary

Predators drive evolutionary changes in prey fish morphology, leading to enhanced swimming speeds. Mosquitofish populations exposed to predators evolved distinct body shapes for faster escape bursts.

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Area of Science:

  • Evolutionary biology
  • Ecology
  • Biophysics

Background:

  • Predation is a significant driver of evolutionary diversification.
  • Fast-start swimming is crucial for prey fish to evade predators.
  • Morphological adaptations for enhanced speed are expected in high-predation environments.

Purpose of the Study:

  • To test if predation pressure drives the evolution of morphological traits related to fast-start performance in western mosquitofish (Gambusia affinis).
  • To investigate the link between body shape divergence and burst-swimming speed in response to predation.

Main Methods:

  • Compared body morphology and measured burst-swimming speeds of mosquitofish from predator-present and predator-free populations.
  • Utilized biomechanical models and intrapopulation correlations to assess the role of morphology in performance.

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  • Examined the heritability of morphological differences by raising offspring in a common environment.

    • Main Results:

    • Mosquitofish from high-predation environments showed consistent divergence in body shape (larger caudal region, smaller head, more elongate body, posterior eye).
    • Individuals from predator populations exhibited approximately 20% faster burst-swimming speeds.
    • Morphological differences were heritable and largely explained the enhanced locomotor performance.

    Conclusions:

    • Divergent selection imposed by predators has led to significant phenotypic divergence in mosquitofish populations.
    • The observed ecomorphological adaptations enhance prey escape capabilities, supporting the role of predation in shaping prey evolution.
    • These findings suggest a general model for predator-driven ecomorphological evolution applicable to many aquatic taxa.