中文摘要：

岩羊Pseudois nayaur是目前岩羊属Pseudois中承认的唯一物种,主要分布在青藏高原及其周边山脉地区,是该地区代表性的大型有蹄类动物。岩羊种内存在矮岩羊这一个形态特异的种群,其分类地位一直处在争议当中。本次研究从岩羊分布区域内搜集到26个岩羊样品,其中包括5个矮岩羊样品,选取了COⅠ基因DNA条形码标准区域和8个微卫星标记位点探讨了矮岩羊与岩羊不同地理种群的系统进化关系,同时分析了矮岩羊的进化地位。结果表明矮岩羊和岩羊间目前处于基因交流半隔离状态,不应该被分为2个不同的物种或者亚种,而矮岩羊应该被作为岩羊四川亚种P.n.szechuanensis中一个形态变异的特殊分类群。另外,结合生境选择和生态观察的结果推测矮岩羊目前可能已经处于单独进化的早期阶段。

英文摘要：

As a unique species in genus Pseudois,Pseudois nayaur is endemic to the Tibetan Plateau and surrounding mountains,and this species is also the representative ungulate herbivore in this area. The taxonomic status of a specific population named dwarf blue sheep has been widely debated. In this study,26 samples including 5 dwarf blue sheep were collected from the distribution area. The DNA barcording and 8 nuclear microsatellite markers were chosen to discuss the phylogenetic relationships among dwarf blue sheep and different geographic populations of P. nayaur,and to study the evolutionary status of dwarf blue sheep in genus Pseudois. The results showed that gene flow occurred between dwarf blue sheep and P. nayaur,and dwarf blue sheep should be classified as a specific population of Sichuan subspecies rather than a new species or a new subspecies. In addition,based on the results of the habitat selection and the ecological data,we speculated that the present dwarf blue sheep was probably in the early stage of separate evolution.