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Sympatric speciation by sexual selection.

M Higashi1, G Takimoto, N Yamamura

  • 1Center for Ecological Research, Kyoto University, Japan. higashi@ecology.kyoto-u.ac.jp

Nature
|December 11, 1999
PubMed
Summary
This summary is machine-generated.

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Sexual selection can drive sympatric speciation, where new species arise without geographic barriers. This occurs when male traits and female preferences diverge, leading to reproductive isolation.

Area of Science:

  • Evolutionary Biology
  • Speciation Research

Background:

  • Sympatric speciation, the evolution of reproductive isolation without physical separation, is increasingly supported by evidence.
  • Theoretical models often emphasize disruptive natural selection as the primary driver of sympatric speciation.

Purpose of the Study:

  • To investigate the theoretical possibility of sympatric speciation driven by sexual selection, independent of disruptive natural selection.
  • To explore the conditions under which sexual selection can lead to the divergence of populations within the same geographic area.

Main Methods:

  • Theoretical modeling of evolutionary processes.
  • Analysis of joint evolution of male secondary sexual characters and female mating preferences.
  • Examination of trait distributions and their divergence.

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Main Results:

  • Sexual selection, specifically through divergent male traits and female preferences, can lead to sympatric speciation.
  • Bimodal distributions in male and female traits emerge, promoting prezygotic isolation.
  • Increased female discrimination efficiency or decreased cost of male conspicuousness favors this speciation mode.

Conclusions:

  • Sexual selection provides a novel mechanism for sympatric speciation, complementing disruptive natural selection.
  • Conditions like barrier-free or predator-free environments may enhance the likelihood of sexual selection-driven sympatric speciation.
  • Divergent runaway processes, not necessarily runaway sexual selection itself, drive sympatric speciation.