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Related Experiment Video

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Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus
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Why do hybrids turn down sex?

Frédéric Fyon1, Waldir Miron Berbel-Filho2, Ingo Schlupp2

  • 1Department of Biology, Royal Holloway University of London, Egham, United Kingdom.

Evolution; International Journal of Organic Evolution
|July 17, 2023
PubMed
Summary
This summary is machine-generated.

Asexual reproduction can evolve in hybrids through an adaptive route, not just reproductive failure. This study models how reproductive alterations can rescue hybrid reproduction, offering a new explanation for the link between asexuality and hybridization.

Keywords:
asexual reproductionevolution of asexualityhybridizationmaintenance of sexreproductive assurance

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Reproductive Biology

Background:

  • Asexual reproduction is ancestral, while sexual reproduction in eukaryotes is a major evolutionary transition.
  • The maintenance of sex in eukaryotes is a long-standing question in evolutionary biology.
  • Many asexual species are of hybrid origin, suggesting a link between hybridization and asexuality.

Purpose of the Study:

  • To propose and model an alternative, adaptive route for the evolution of asexuality from sexual hybrids.
  • To investigate how reproductive alterations can rescue hybrid reproduction and lead to asexuality.
  • To explore the independent evolution of key asexual traits under specific genetic incompatibilities.

Main Methods:

  • Development of a mathematical model to simulate the evolution of asexuality in hybrids.
  • Analysis of reproductive alterations and their impact on hybrid fertility.
  • Examination of the conditions under which unreduced meiosis and parthenogenesis can evolve separately.

Main Results:

  • Asexual reproduction can evolve adaptively in hybrids under certain reproductive alterations.
  • These alterations can rescue reproduction in hybrids, providing a route to asexuality.
  • Genetic incompatibilities affecting only gamete fusion facilitate the separate evolution of unreduced meiosis and parthenogenesis.

Conclusions:

  • The study provides a novel, adaptive explanation for the evolution of asexuality in hybrid species.
  • This mechanism may complement existing theories linking hybridization and asexuality.
  • The independent evolution of asexual traits offers a plausible pathway for the transition from sexual hybridization to stable asexuality.