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Related Experiment Videos

Evolution of sexual preferences in quantitative characters.

S Karlin1, J Raper

  • 1Department of Mathematics, Stanford University, California 94305.

Theoretical Population Biology
|December 1, 1990
PubMed
Summary

Female mating preferences for male traits can diverge, challenging traditional models of sexual selection. This study reinterprets Fisher's runaway process, linking it to viability selection shifts and trait optima.

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Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics
  • Behavioral Ecology

Background:

  • Sexual selection drives the evolution of secondary sexual characters.
  • Fisher's "runaway" process describes rapid trait evolution driven by female preference.
  • Existing models often approximate genetic covariance evolution.

Purpose of the Study:

  • To analyze the equilibria and dynamics of female mating preference for quantitative male traits.
  • To re-examine Fisher's runaway process of sexual selection under a Gaussian model.
  • To contrast evolving distributions with constant covariance models.

Main Methods:

  • Gaussian model analysis of means, variances, and covariances.
  • Examination of viability and sexual selection parameters.
  • Analysis of phenotype distribution convergence and divergence.

Main Results:

  • Evolving Gaussian distributions of phenotypes can diverge under specific selection parameters.
  • Convergence cases offer reinterpretations of Fisher's runaway process.
  • Runaway evolution is linked to shifts in viability selection and trait optima.

Conclusions:

  • The study provides a nuanced understanding of sexual selection dynamics.
  • Fisher's "initial advantage" can be reinterpreted as a viability selection shift.
  • Results differ from models assuming constant genetic covariance.

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