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    A comparative approach to testing hypotheses for the evolution of sex-biased dispersal in bean beetles

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    Downey, Michelle H.; Searle, Rebecca; Bellur, Sunil; Geiger, Adam; Maitner, Brian S.; More... Ohm, Johanna R.; Tuda, Midori; Miller, Tom E.X. Less...
    Date
    2015
    Abstract
    Understanding the selective forces that shape dispersal strategies is a fundamental goal of evolutionary ecology and is increasingly important in changing, human-altered environments. Sex-biased dispersal (SBD) is common in dioecious taxa, and understanding variation in the direction and magnitude of SBD across taxa has been a persistent challenge. We took a comparative, laboratory-based approach using 16 groups (species or strains) of bean beetles (generaᅠAcanthoscelides,ᅠCallosobruchus, andᅠZabrotes, including 10 strains of one species) to test two predictions that emerge from dominant hypotheses for the evolution of SBD: (1) groups that suffer greater costs of inbreeding should exhibit greater SBD in favor of either sex (inbreeding avoidance hypothesis) and (2) groups with stronger local mate competition should exhibit greater male bias in dispersal (kin competition avoidance hypothesis). We used laboratory experiments to quantify SBD in crawling dispersal, the fitness effects of inbreeding, and the degree of polygyny (number of female mates per male), a proxy for local mate competition. While we found that both polygyny and male-biased dispersal were common across bean beetle groups, consistent with the kin competition avoidance hypothesis, quantitative relationships between trait values did not support the predictions. Across groups, there was no significant association between SBD and effects of inbreeding nor SBD and degree of polygyny, using either raw values or phylogenetically independent contrasts. We discuss possible limitations of our experimental approach for detecting the predicted relationships, as well as reasons why single-factor hypotheses may be too simplistic to explain the evolution of SBD.
    Citation
    Downey, Michelle H., Searle, Rebecca, Bellur, Sunil, et al.. "A comparative approach to testing hypotheses for the evolution of sex-biased dispersal in bean beetles." Ecology and Evolution, 5, no. 21 (2015) Wiley: 4819-4828. http://dx.doi.org/10.1002/ece3.1753.
    Published Version
    http://dx.doi.org/10.1002/ece3.1753
    Keyword
    Bean beetle; inbreeding; mating system; polygyny; sex-biased dispersal
    Type
    Journal article
    Publisher
    Wiley
    Citable link to this page
    https://hdl.handle.net/1911/87880
    Rights
    This is an open access article under the terms of theᅠCreative Commons AttributionᅠLicense, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
    Link to License
    http://creativecommons.org/licenses/by/4.0/
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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map