Chen Shunde, Sun Zhiyu, He Kai, Jiang Xuelong, Liu Yang, Koju Narayan Prasad, Zhang Xiuyue, Tu Feiyun, Fan Zhenxing, Liu Shaoying, Yue Bisong
Key Laboratory of Bio-Resources and Eco-Environment, Ministry of Education, Sichuan University, Chengdu 610064, China; College of Life Sciences, Sichuan Normal University, Chengdu 610066, China; Mammal Ecology and Evolution Research Group, State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China.
Sichuan Academy of Forestry, Chengdu 610081, China.
Mol Phylogenet Evol. 2015 Mar;84:245-53. doi: 10.1016/j.ympev.2014.12.016. Epub 2015 Jan 21.
The southeastern margin of the Tibetan Plateau is characterized by complex topography and a discontinuous landscape, creating a sky island situation. However, the way topography shapes genetic structures and demographic histories of endemic species has not been well studied. We examined the phylogeographic pattern and demographic histories of Sorex bedfordiae, a dispersal-limited small mammal, using three nuclear genes [1977bp] and two mitochondrial genes [1794bp] with comprehensive molecular approaches. We recovered five well-supported clades whose distributions are along mountain ridges and roughly subdivided by large rivers. Demographic expansions in the middle Pleistocene were strongly supported by both nuclear and mitochondrial genes. Our results support the hypothesis that sky island topography and river systems strongly affect the genetic structure of non-aquatic terrestrial species. We further clarify that S. bedfordiae and S. cylindricauda are valid sibling species, whereas S. excelsus is most likely a geographic subspecies of S. bedfordiae.
青藏高原东南边缘地形复杂，地貌破碎，形成了“天空岛”的格局。然而，地形塑造特有物种遗传结构和种群历史的方式尚未得到充分研究。我们运用综合分子方法，通过三个核基因（1977bp）和两个线粒体基因（1794bp），研究了扩散受限的小型哺乳动物——贝氏鼩鼱的系统发育地理格局和种群历史。我们识别出五个得到有力支持的分支，它们沿着山脊分布，大致被大的河流分隔。中更新世的种群扩张得到了核基因和线粒体基因的有力支持。我们的结果支持了“天空岛”地形和河流系统强烈影响非水生陆生物种遗传结构的假说。我们进一步明确，贝氏鼩鼱和圆筒鼩鼱是有效的姐妹物种，而卓越鼩鼱很可能是贝氏鼩鼱的一个地理亚种。
