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Related Experiment Videos

Does frequency-dependent selection optimize fitness?

P Y Quenette1, J F Gerard

  • 1Institut de Recherche sur les Grands Mammifères, I.N.R.A. B.P. 27, Castanet-Tolosan, France.

Journal of Theoretical Biology
|December 21, 1992
PubMed
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This study questions the idea that natural selection always maximizes fitness. It critiques the concept of a "competitive optimum" in frequency-dependent selection, suggesting natural selection may not achieve ideal outcomes.

Area of Science:

  • Evolutionary Biology
  • Game Theory
  • Population Genetics

Background:

  • Natural selection is often assumed to maximize inclusive fitness.
  • Selection can be frequency-independent or frequency-dependent.
  • Frequency-dependent selection may lead to a "competitive optimum" rather than maximal population fitness.

Purpose of the Study:

  • To critically evaluate the concept of "competitive optimum" proposed by Parker & Maynard Smith.
  • To question the general capacity of natural selection to "maximize fitness".
  • To examine the ideal effects of natural selection using phenotypic models.

Main Methods:

  • Theoretical analysis of evolutionary game theory concepts.
  • Critique of existing models of frequency-dependent selection.

Related Experiment Videos

  • Examination of phenotypic models that abstract from genetic constraints.

    • Main Results:

    • The concept of "competitive optimum" is challenged.
    • The assumption that natural selection invariably maximizes fitness is questioned.
    • Phenotypic models reveal limitations in natural selection's optimization capabilities.

    Conclusions:

    • Natural selection's ability to maximize fitness, even in simplified models, is not absolute.
    • The "competitive optimum" may not represent a true maximization of fitness in frequency-dependent scenarios.
    • Further theoretical work is needed to understand the precise outcomes of natural selection under different conditions.