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Continual change in mate preferences

Y Iwasa1, A Pomiankowski

  • 1Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan.

Nature
|October 5, 1995
PubMed
Summary
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Fisher

Area of Science:

  • Evolutionary biology, focusing on sexual selection and speciation.

Background:

  • Secondary sexual characters exhibit significant variation within and between species.
  • Closely related species often show marked differences in sexual morphology but not in non-sexual traits.

Purpose of the Study:

  • To investigate the dynamic behavior of Fisher's runaway process in sexual selection.
  • To understand the mechanisms driving the evolution of sexual traits and species divergence.

Main Methods:

  • Theoretical modeling of Fisher's runaway process.
  • Analysis of trait dynamics under sexual selection, incorporating female preference and male traits.
  • Exploration of the impact of mutation bias on trait evolution.

Main Results:

  • Fisher's runaway process is inherently unstable, leading to continuous change in sexual traits.

Related Experiment Videos

  • The process involves cycles of trait exaggeration and decay, driving divergence in allopatric populations.
  • Mutation bias can halt this continuous change, leading to stable equilibria, especially when traits signal genetic quality.

    • Conclusions:

    • Sexual selection, via Fisher's runaway process, is a potent driver of rapid evolution in secondary sexual characters.
    • This mechanism explains rapid divergence in sexual traits between closely related species.
    • The interplay between sexual selection and mutation bias shapes the long-term evolutionary trajectory of sexual traits.