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Simultaneous hermaphroditism and sexual selection.

E L Charnov1

  • 1Department of Biology, University of Utah, Salt Lake City, Utah 84112.

Proceedings of the National Academy of Sciences of the United States of America
|May 1, 1979
PubMed
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Reproductive success in hermaphrodites, like in separate-sex species, is limited by resources for egg production, not sperm availability. This suggests sperm competition and sexual conflict influenced hermaphroditism evolution.

Area of Science:

  • Evolutionary biology
  • Reproductive strategies
  • Sexual selection

Background:

  • Sexual reproduction theories often assume resource limitation for egg production in females.
  • Male reproductive success is typically limited by access to females and their eggs.

Purpose of the Study:

  • To propose that egg production in simultaneous hermaphrodites is also resource-limited, not sperm-limited.
  • To explore the implications of this principle for the evolution of hermaphroditism.

Main Methods:

  • Theoretical analysis of reproductive strategies in hermaphroditic species.
  • Comparison with established theories on sexual selection in dioecious species.

Main Results:

  • Egg production in simultaneous hermaphrodites is hypothesized to be limited by resource allocation to eggs.

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  • This aligns with the principle that female reproductive output is resource-dependent.

    • Conclusions:

    • The evolution of hermaphroditism may have been significantly shaped by sperm competition.
    • Sexual conflict between male and female functions likely played a crucial role in the evolution of hermaphroditism.