异质双斑块环境中的性别分配与扩散

Sex allocation and dispersal in a heterogeneous two-patch environment.

作者信息

Wild Geoff, Greenwood-Lee James, Taylor Peter D

机构信息

Department of Mathematics and Statistics, Queen's University, Kingston, Ontario, Canada K7L 3N6.

出版信息

Theor Popul Biol. 2006 Sep;70(2):225-35. doi: 10.1016/j.tpb.2005.10.002. Epub 2005 Dec 27.

DOI:10.1016/j.tpb.2005.10.002

PMID:16376959

Abstract

We investigate the evolution of sex allocation and dispersal in a two-habitat environment using a game theoretic analysis. One habitat is of better quality than the other and increased habitat quality influences the competitive ability of offspring in a sex-specific manner. Unlike previous work, we allow incomplete mixing of the population during mating. We discuss three special cases involving the evolution of sex allocation under fixed levels of dispersal between habitats. In these special cases, stable sex-allocation behaviors can be both biased and unbiased. When sex-allocation behavior and dispersal rates co-evolve we identify two basic outcomes. First-when sex-specific differences in the consequences of spatial heterogeneity are large-we predict the evolution of biased sex-allocation behavior in both habitats, with dispersal by males in one direction and dispersal by females in the other direction. Second-when sex-specific differences are small-unbiased sex-allocation is predicted with no dispersal between habitats.

摘要

我们运用博弈论分析方法，研究了两性分配和扩散在双栖息地环境中的演变情况。其中一个栖息地质量优于另一个，栖息地质量的提高以性别特异性方式影响后代的竞争能力。与之前的研究不同，我们允许种群在交配期间不完全混合。我们讨论了三种特殊情况，涉及在栖息地之间固定扩散水平下的两性分配演变。在这些特殊情况下，稳定的两性分配行为既可以是有偏差的，也可以是无偏差的。当两性分配行为和扩散率共同演变时，我们确定了两种基本结果。第一，当空间异质性后果的性别特异性差异很大时，我们预测两个栖息地都会出现有偏差的两性分配行为的演变，雄性向一个方向扩散，雌性向另一个方向扩散。第二，当性别特异性差异很小时，预测会出现无偏差的两性分配，且栖息地之间没有扩散。