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Sex allocation in a patchy environment: a marginal value theorem.

E L Charnov, J J Bull

    Journal of Theoretical Biology
    |August 21, 1985
    PubMed
    Summary
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    The evolutionary stable strategy (ESS) for sex allocation, considering varying male/female fitnesses across patch types, results in equalizing fitness tradeoffs or pure sexes. This principle applies to hermaphrodites and is generalized to other sex allocation scenarios.

    Area of Science:

    • Evolutionary biology
    • Population genetics
    • Behavioral ecology

    Background:

    • Sex allocation theory explains the distribution of resources towards male or female reproduction.
    • Understanding sex allocation is crucial for predicting species' evolutionary trajectories and population dynamics.
    • Fitness variations across different environments (patch types) can significantly influence reproductive strategies.

    Purpose of the Study:

    • To determine the evolutionary stable strategy (ESS) for sex allocation when male and female fitnesses differ across patch types.
    • To investigate the conditions under which mixed or pure sex allocation strategies evolve.
    • To generalize findings from hermaphrodites to other reproductive systems.

    Main Methods:

    • Mathematical modeling of sex allocation under varying environmental conditions.

    Related Experiment Videos

  • Analysis of fitness tradeoffs between male and female reproductive success.
  • Derivation of ESS conditions for different sex allocation scenarios.

    • Main Results:

    • The ESS sex allocation strategy equalizes the marginal fitness returns for male and female reproduction.
    • Alternatively, the ESS may result in populations with pure males or pure females.
    • The model demonstrates that patch-specific fitness variations drive these allocation patterns.

    Conclusions:

    • Sex allocation strategies are adaptively sensitive to environmental heterogeneity.
    • The ESS framework provides a robust method for predicting reproductive strategies in variable environments.
    • Findings have broad implications for understanding sexual reproduction and population persistence.