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Related Experiment Video

Updated: May 1, 2026

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Evolution: don't be so butch, dear!

Lukas Schärer1

  • 1Evolutionary Biology, Zoological Institute, University of Basel, Vesalgasse 1, CH-4051 Basel, Switzerland.

Current Biology : CB
|April 17, 2014
PubMed
Summary

Simultaneous hermaphrodites, possessing both male and female reproductive organs, may face conflicts regarding sexual investment. Seminal fluids transferred during mating in freshwater snails were found to influence the partner

Area of Science:

  • * Evolutionary biology
  • * Reproductive strategies
  • * Animal behavior

Background:

  • * Simultaneous hermaphrodites possess both male and female reproductive functions.
  • * Potential for conflict exists over optimal resource allocation to each sexual role.
  • * Seminal fluid composition and function are critical in many species.

Purpose of the Study:

  • * To investigate the impact of seminal fluid transfer on the male function of simultaneous hermaphrodites.
  • * To explore potential conflicts arising from differential investment in sexual reproduction.

Main Methods:

  • * Experiments were conducted on freshwater snails, a model organism for simultaneous hermaphroditism.
  • * Seminal fluid transfer was manipulated or observed during mating events.

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  • * Measures of male reproductive success and investment were assessed post-mating.

    • Main Results:

    • * Evidence suggests that seminal fluids transferred from one snail to another significantly affect the recipient's male function.
    • * This interaction indicates a complex interplay between partners' reproductive investments.

    Conclusions:

    • * Seminal fluid plays a crucial role in modulating reproductive interactions in simultaneous hermaphrodites.
    • * Findings highlight the evolutionary dynamics and potential conflicts in simultaneous hermaphroditic reproduction.