关键词: 祁连山, 兽类, 分布格局, 动物地理

Abstract: The Qilian Mountain is located in the northeastern margin of Qinghai-Tibet Plateau. The authors had conducted two surveys on distributions of mammals in the Qilian Mountain and its adjacent area during the summer in 2001 - 2002. Altogether 72 species of mammals have been recorded in our investigational area , belongings to 7 orders , 20 families and 53 genera. Among them , 62 species which occupying 86.1 %of the total number of the mammals are considered to be Palaearctic and 7 species to be Oriental mammals , besides , the others to be widely spread mammals. On the basis of comprehensive physical factors including altitude , landforms , climate , vegetation , hydrology , land2use , etc. , the reasearch area was divided into 10 basic units (Operational Taxonomic Unit , OTU). Then the information of mammals in each unit was used to compute species composition similarity for the 10 units , using clustering methods. The clustering results indicated that the fauna on mammals in Huangshui Valley is quite different from all the other areas. The central area of Qilian Mountain is similar to the mountain area of Northern Qinghai Lake. The faunal differences between the Western Chaidamu Basin and the Mountain area of eastern Chaidamu Basin are obviously existent. The Mountain area of eastern Chaidamu Basin has a much closer relationship with the Central area of Qilian Mountain than that with the western and central area of Chaidamu Basin. Ecologically the existence of Qilian Mountain have caused obvious edge effects on mammal diversity and zoogeography. The species composition of mammals in this area not only have some similarity to Qinghai-Tibet Plateau , but also have a close relationship with Xinjiang area. For these reasons , the mammal diversity and zoogeography of the Qilian Mountain could be considered as a transitional area.

Key words: Distribution, Zoogeographical analysis, Mammals, Qilian Mountain area