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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
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Cryptic female choice can maintain reproductive isolation.

Matthew C Kustra1,2,3,4, Maria R Servedio5, Suzanne H Alonzo4

  • 1Miller Institute for Basic Research in Science, University of California, Berkeley, United States.

Evolution; International Journal of Organic Evolution
|July 29, 2025
PubMed
Summary
This summary is machine-generated.

Cryptic female choice, where females favor sperm from their own species, can drive speciation. This postmating sexual selection maintains reproductive isolation, especially with low migration or ecological divergence.

Keywords:
conspecific sperm precedencemathematical modelpostcopulatory sexual selectionspeciationtheory

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Area of Science:

  • Evolutionary Biology
  • Speciation Research
  • Sexual Selection Studies

Background:

  • Sexual selection is a key driver of speciation, yet theory primarily addresses premating selection.
  • Postmating sexual selection, particularly cryptic female choice, is increasingly recognized but less theorized.
  • Cryptic female choice can lead to conspecific sperm precedence, biasing fertilization towards same-species males.

Purpose of the Study:

  • To investigate the conditions under which cryptic female choice evolves and maintains reproductive isolation.
  • To explore the role of conspecific sperm precedence in speciation via simulation models.
  • To assess the combined effects of cryptic female choice and ecological divergence on reproductive isolation.

Main Methods:

  • Utilized simulation models of secondary contact between diverging populations.
  • Modeled cryptic female choice leading to conspecific sperm precedence.
  • Varied parameters such as migration rate, preference strength, and mating frequency.

Main Results:

  • Cryptic female choice alone can maintain reproductive isolation under specific conditions (low migration, strong preferences, intermediate mating).
  • When combined with ecological divergence, cryptic female choice effectively maintains reproductive isolation even with high migration rates.
  • Conspecific sperm precedence can evolve via reinforcement mechanisms.

Conclusions:

  • Cryptic female choice is a significant factor in maintaining reproductive isolation.
  • This postmating sexual selection mechanism can contribute to species divergence and the maintenance of species.
  • The study highlights the importance of incorporating postmating sexual selection into speciation theory.