横断山区同域鼩鼱姐妹种的比较谱系地理学研究

生态习性和遗传背景的不同是导致同域物种谱系地理格局不一致的重要因素，其作用机制仍不清楚。前期研究表明同域分布在横断山区的大纹背鼩鼱和小纹背鼩鼱是由同一祖先不同进化支系演化而来的一对姐妹种，它们形态相似、生境相同、生态习性相近，是研究同域物种比较谱系地理学的天然模型。本项目拟利用多种分子标记和二代测序技术，比较分析它们的种群分化格局和种群历史动态，在静态和动态水平揭示形态相似、生境相同、生态习性相近的同域姐妹种谱系地理发生规律是否具有高度一致性。同时，结合横断山区的地质历史事件，分析在相同的外部环境和遗传背景条件下姐妹种生态习性差异对谱系地理发生规律影响的异同，揭示自身生态属性对姐妹种谱系地理格局形成和遗传分化的影响。本项目将为阐明横断山区姐妹种现有谱系地理格局的形成与演化及其对这一地区环境历史事件的响应规律提供重要的科学依据。

Sympatric species show different phylogeography patterns, which may be attributed to their different ecological habits and genetic relationship. However，the mechanism is still poorly understood. Previous studies have shown the two species, Sorex cylindricauda and Sorex bedfordiae, originated from same ancestor with same living environment, similar morphology and ecological habits in Hengduan Moutains, as a pair of natural model for comparative phylogeography of sympatric species. In this study, we attempt to compare the phylogeographical patterns of sympatric sister species by several molecular makers and next-generation sequencing technique. This study aims to investigate whether a consistent distribution patterns and historical demography happened to sympatric sister species with same living environment, similar morphology and ecological habits. At the same time, combined geological historic events, we attempt to analyze the similarities and differences of the influence of different ecological habits for phylogeography pattern of the sympatric sister species under the same environmental history events and genetic relationship, and to understand the role of biological inherent attribute in species differentiation and evolution of biogeographical pattern of the sympatric sister species. This study will to provide insights into the evolution of biogeographical pattern for the sympatric sister species, and their response mechanism for geological historic events in the Hengduan Moutains.