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Related Experiment Videos

Experimental evidence for multivariate stabilizing sexual selection.

Robert Brooks1, John Hunt, Mark W Blows

  • 1School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia. rob.brooks@unsw.edu.au

Evolution; International Journal of Organic Evolution
|June 2, 2005
PubMed
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Stabilizing selection drives populations toward an optimal trait, a prediction tested using cricket mating calls. Researchers found evidence of stabilizing sexual selection on male cricket calls, with population means matching the predicted fitness peak.

Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Quantitative genetics

Background:

  • Stabilizing selection predicts populations evolve towards an optimal phenotype (fitness peak).
  • Empirical testing of multivariate stabilizing selection on correlated traits is challenging.
  • Detecting population means at multivariate fitness peaks requires robust methods.

Purpose of the Study:

  • To develop and apply methods for defining and testing multivariate stabilizing selection.
  • To determine if natural populations reside at the peak of multivariate fitness surfaces.
  • To investigate the role of stabilizing sexual selection in the evolution of male cricket calls.

Main Methods:

  • Utilized canonical analysis of fitness surfaces and confidence regions for stationary points.

Related Experiment Videos

  • Manufactured artificial cricket advertisement calls for laboratory phonotaxis trials.
  • Estimated linear and nonlinear sexual selection imposed by female choice on male call structure.

    • Main Results:

    • Identified convex nonlinear selection with an intermediate optimum, indicating multivariate stabilizing selection.
    • Male cricket call phenotypes were within the 95% confidence region of the fitness peak.
    • Demonstrated stabilizing sexual selection on a suite of male call traits in Teleogryllus commodus.

    Conclusions:

    • Canonical analysis and confidence regions effectively define and test multivariate stabilizing selection.
    • Natural populations of Teleogryllus commodus are situated at the fitness peak for male call traits.
    • Stabilizing sexual selection is a significant evolutionary force shaping male call properties in this species.