Effects of population dynamics and dispersal on the formation of spatial genetic structure in gray-sided vole populations

由于大多数种群长期在相互作用中维持自身，因此关于种群结构的知识对于理解其可持续性的机制是必不可少的。在这项研究中，我对一个啮齿动物种群的结构进行了为期4年的调查，并考虑了它们的动态(遗传漂移)和扩散(基因流动)。主要研究结果如下：(1)基因流动量在性别间存在差异。雌性个体的尺度(500m)小于雄性个体(2000m)；(2)线粒体DNA的空间结构与微卫星DNA的空间结构不同。一个基于微卫星DNA的种群包括几个基于mtDNA的种群；(3)种群动态对雌性种群的影响显著。在低密度年，遗传漂移的影响超过了基因流动的影响。

Since most populations long sustain themselves in their mutual interaction, the knowledge about the population structure is essential to understand a mechanism of their sustainability. In this study I investigated the structure of a rodent population for 4 years taking their dynamics (genetic drift) and dispersal (gene flow) into consideration. The main results are as follows: (1) A scale of gene flows differed between sexes. Females' scale (500 m) was smaller than males' (2000 m); (2) The spatial structure differed between mtDNA-based and microsatellite DNA-based structure. A microsatellite DNA-based population included several mtDNA-based populations; (3) Effects of population dynamics was significant in females. Effects of genetic drift dominated over those of gene flow in a low density year.