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Evolution of mating preference and sexual dimorphism.

R Lande, S J Arnold

    Journal of Theoretical Biology
    |December 21, 1985
    PubMed
    Summary

    Female mating preferences and sexual dimorphism evolve through indirect selection in polygamous species. Their evolutionary paths depend on natural selection, mating preferences, and inheritance, potentially leading to maladaptive traits.

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    Area of Science:

    • Evolutionary biology
    • Quantitative genetics
    • Sexual selection

    Background:

    • Sexual dimorphism and mating preferences are key evolutionary traits.
    • Understanding their joint evolution requires quantitative genetic models.
    • Polygamous species without male parental care present a unique model system.

    Purpose of the Study:

    • To model the joint evolution of female mating preferences and sexual dimorphism.
    • To investigate evolution driven by indirect selection on correlated characters.
    • To explore conditions for stable and unstable evolutionary equilibria.

    Main Methods:

    • Developed a quantitative genetic model.
    • Analyzed stabilizing natural selection on homologous sexual characters.
    • Examined indirect selection on mating preferences.

    Main Results:

    • Female characters reach their optimum under natural selection at equilibrium.
    • A line of equilibria exists between mating preferences and male characters.
    • Equilibria stability depends on selection intensity, preference type, and inheritance.

    Conclusions:

    • Mating preferences can evolve indirectly, even if selectively neutral.
    • Maladaptive evolution of mating preferences and sexual dimorphism is possible.
    • The model provides insights into the complex interplay of selection and inheritance.

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