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    Sex-biased dispersal and the speed of two-sex invasions

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    659628.pdf (3.473Mb)
    Date
    2011-04-07
    Author
    Miller, Tom E. X.  Concept link
    Shaw, Allison K.  Concept link
    Inouye, Brian D.  Concept link
    Neubert, Michael G.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4617
    As published
    https://doi.org/10.1086/659628
    DOI
    10.1086/659628
    Keyword
     Integrodifference equations; Invasion speed; Mating functions; Marriage squeeze; Sex-biased dispersal; Spatial spread 
    Abstract
    Population models that combine demography and dispersal are important tools for forecasting the spatial spread of biological invasions. Current models describe the dynamics of only one sex (typically females). Such models cannot account for the sex-related biases in dispersal and mating behavior that are typical of many animal species. In this article, we construct a two-sex integrodifference equation model that overcomes these limitations. We derive an explicit formula for the invasion speed from the model and use it to show that sex-biased dispersal may significantly increase or decrease the invasion speed by skewing the operational sex ratio at the invasion’s low-density leading edge. Which of these possible outcomes occurs depends sensitively on complex interactions among the direction of dispersal bias, the magnitude of bias, and the relative contributions of females and males to local population growth.
    Description
    Author Posting. © University of Chicago, 2011. This article is posted here by permission of University of Chicago for personal use, not for redistribution. The definitive version was published in American Naturalist 177 (2011): 549-561, doi:10.1086/659628.
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    • Biology
    Suggested Citation
    American Naturalist 177 (2011): 549-561
     

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