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  1. AU="Chokechaipaisarn, Chedhawat"
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  1. Article ; Online: A simulation test of the prediction that density-dependent dispersal promotes female-biased sex allocation in viscous populations.

    Chokechaipaisarn, Chedhawat / Gardner, Andy

    microPublication biology

    2023  Volume 2023

    Abstract: A classic result of sex-allocation theory is that the sex ratio is predicted to be invariant with respect to the rate of dispersal. However, a recent mathematical analysis has suggested that if individuals are able to adjust their probability of ... ...

    Abstract A classic result of sex-allocation theory is that the sex ratio is predicted to be invariant with respect to the rate of dispersal. However, a recent mathematical analysis has suggested that if individuals are able to adjust their probability of dispersal according to the local density of their neighbourhood, then a lower rate of dispersal will be associated with greater female-bias. Here, we perform a computer simulation test of this prediction. Our simulation data provide strong qualitative support for the prediction, and a Monte Carlo randomization test of significance allows us to reject the null hypothesis of the invariance relationship.
    Language English
    Publishing date 2023-07-11
    Publishing country United States
    Document type Journal Article
    ISSN 2578-9430
    ISSN (online) 2578-9430
    DOI 10.17912/micropub.biology.000821
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Density-dependent dispersal promotes female-biased sex allocation in viscous populations.

    Chokechaipaisarn, Chedhawat / Gardner, Andy

    Biology letters

    2022  Volume 18, Issue 8, Page(s) 20220205

    Abstract: A surprising result emerging from the theory of sex allocation is that the optimal sex ratio is predicted to be completely independent of the rate of dispersal. This striking invariance result has stimulated a huge amount of theoretical and empirical ... ...

    Abstract A surprising result emerging from the theory of sex allocation is that the optimal sex ratio is predicted to be completely independent of the rate of dispersal. This striking invariance result has stimulated a huge amount of theoretical and empirical attention in the social evolution literature. However, this sex-allocation invariant has been derived under the assumption that an individual's dispersal behaviour is not modulated by population density. Here, we investigate how density-dependent dispersal shapes patterns of sex allocation in a viscous-population setting. Specifically, we find that if individuals are able to adjust their dispersal behaviour according to local population density, then they are favoured to do so, and this drives the evolution of female-biased sex allocation. This result obtains because, whereas under density-independent dispersal, population viscosity is associated not only with higher relatedness-which promotes female bias-but also with higher kin competition-which inhibits female bias-under density-dependent dispersal, the kin-competition consequences of a female-biased sex ratio are entirely abolished. We derive analytical results for the full range of group sizes and costs of dispersal, under haploid, diploid and haplodiploid modes of inheritance. These results show that population viscosity promotes female-biased sex ratios in the context of density-dependent dispersal.
    MeSH term(s) Biological Evolution ; Female ; Humans ; Population Density ; Sex Ratio ; Viscosity
    Language English
    Publishing date 2022-08-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2135022-X
    ISSN 1744-957X ; 1744-9561
    ISSN (online) 1744-957X
    ISSN 1744-9561
    DOI 10.1098/rsbl.2022.0205
    Database MEDical Literature Analysis and Retrieval System OnLINE

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