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Assessing Differences in Sperm Competitive Ability in Drosophila
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Multivariate Sexual Selection on Ejaculate Traits under Sperm Competition.

Rowan A Lymbery, W Jason Kennington, Jonathan P Evans

    The American Naturalist
    |June 14, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Sperm competition drives sexual selection on sperm traits. This study reveals nonlinear selection on sperm length, velocity, and linearity, showing how these traits evolve under competition.

    Keywords:
    external fertilizationmultivariate selectionsexual selectionsperm competitionsperm phenotypesperm quality

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    Area of Science:

    • Evolutionary Biology
    • Reproductive Biology
    • Marine Invertebrate Ecology

    Background:

    • Sperm competition is a significant evolutionary force, subjecting ejaculates to intense sexual selection.
    • Previous studies faced challenges in comparing fitness across genotypes and isolating fertilization success from postzygotic effects.

    Purpose of the Study:

    • To overcome limitations in studying sexual selection on gametes.
    • To characterize multivariate sexual selection on sperm traits during competitive fertilization.
    • To investigate patterns of linear and nonlinear selection on sperm morphology and motility.

    Main Methods:

    • Utilized a broadcast spawning marine invertebrate for experimental tractability.
    • Tracked real-time sperm success in multimale spawning events using fluorescent tags within fertilized eggs.
    • Applied multivariate selection analyses to identify selection patterns on multiple sperm traits.

    Main Results:

    • Identified significant nonlinear sexual selection acting on combinations of sperm traits.
    • Observed selection against divergent combinations of sperm length, velocity, and swimming path linearity.
    • These patterns suggest selection favors specific swimming strategies for egg location and tracking.

    Conclusions:

    • Demonstrated overall patterns of selection on ejaculates across realistic interactions.
    • Confirmed the potential for adaptive evolution of ejaculate traits under sperm competition.
    • Highlights the importance of multivariate approaches in understanding gametic sexual selection.