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Related Experiment Videos

Natural selection and divergence in mate preference during speciation.

Patrik Nosil1, Bernard J Crespi, Regine Gries

  • 1Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada. pnosila@sfu.ca

Genetica
|August 11, 2006
PubMed
Summary

Sexual isolation evolves through various processes, including host adaptation and reinforcement. In Timema cristinae stick-insects, host-plant adaptation drives isolation, with strongest isolation occurring where populations meet, suggesting reinforcement.

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Area of Science:

  • Evolutionary Biology
  • Speciation
  • Behavioral Ecology

Background:

  • Sexual isolation is key to speciation, but its evolutionary drivers are diverse.
  • Processes beyond natural selection against hybrids, like host adaptation, can also promote reproductive isolation.
  • Understanding these diverse selective processes is crucial for explaining variation in sexual isolation.

Purpose of the Study:

  • To review selective processes driving sexual isolation evolution.
  • To describe methods for distinguishing these processes.
  • To assess their contribution to sexual isolation variation in Timema cristinae.

Main Methods:

  • Comparative analysis of sexual isolation in allopatric and sympatric populations of Timema cristinae across different host plants.

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  • Assessment of ecological selection pressures (e.g., predation) and their correlation with mating preferences.
  • Investigation of olfactory communication in sexual isolation.

    • Main Results:

    • Sexual isolation is greater between allopatric populations on different host plants, indicating host adaptation.
    • Strongest sexual isolation occurs in contact zones, consistent with reproductive character displacement and reinforcement.
    • Ecological traits under selection (predation) do not strongly correlate with mating preferences; F1 hybrid inviability is absent.

    Conclusions:

    • Host adaptation and reinforcement contribute to sexual isolation in Timema cristinae.
    • The role of ecological selection and hybrid dysfunction requires further investigation.
    • Olfactory communication is a significant component of sexual isolation in this species.