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Sperm competition I: basic model, ESS and dynamics

T Fryer1, C Cannings, G T Vickers

  • 1School of Mathematics and Statistics, University of Sheffield, Sheffield S3 7RH, U.K.

Journal of Theoretical Biology
|January 20, 1999
PubMed
Summary
This summary is machine-generated.

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Males should use at least half their sperm in the first round of competition to ensure reproductive success. This evolutionarily stable strategy (ESS) is unique and globally stable, even with sperm replenishment.

Area of Science:

  • Evolutionary biology
  • Game theory
  • Behavioral ecology

Background:

  • Sperm competition is a key factor influencing male reproductive strategies.
  • Game theory provides a framework for understanding evolutionarily stable strategies (ESS).
  • The raffle principle describes sperm success allocation in fertilization.

Purpose of the Study:

  • To determine evolutionarily stable strategies for sperm allocation in competitive fertilization.
  • To model male sperm competition using game theory principles.
  • To analyze a two-round sperm competition model.

Main Methods:

  • Formulation of a two-round sperm competition game model.
  • Application of game theory to identify evolutionarily stable strategies (ESS).

Related Experiment Videos

  • Analysis of the stability and uniqueness of the ESS.

    • Main Results:

    • The evolutionarily stable strategy (ESS) dictates using at least half of the sperm in the first round.
    • The identified ESS is unique and globally stable, unlike many classical ESSs.
    • Sperm replenishment and egg oviposition between rounds increase the ESS sperm allocation in the first round.

    Conclusions:

    • Males employing a pure strategy of allocating at least half their sperm in the first round are evolutionarily successful.
    • The model demonstrates a globally stable ESS for sperm competition.
    • Factors like sperm replenishment enhance the advantage of early sperm insemination.