二郎山小型兽类区系及分布格局

The faunal composition and distribution of small mammals in Erlang Mountains

动物种类和数量在不同的山地或同一山地的不同垂直高度有很大的差异,正因如此,国际上和国内的研究者们一直在努力探讨动物在山地的分布规律和产生差异的原因（Merriametal.,1890;鲍毅新等,1984;Heaney,2001;Rickart,2001;Sánchez-Cordero,2001;张云智等,2002;李义明等,2003;马俊等,2010）。横断山是中国最长、最宽和最典型的南北向山系,位于青藏高原东南部,通常为四川、云南两省西部和西藏自治区东部南北向山脉的总称。横断山是全球25个生物多样性热点地区之一，其生物多样性资源极其丰富（My-ers et al．，2000）。

From June to July in 2006 and May in 2011, the faunas and distribution of small mammals （ Insectivora, Ro- dentia and Oehotonidae） in the Erlang Mountains was surveyed. We sampled small mammals using kill traps at five sites at elevations varying from 1 800 to 3 437 m, Within each site, we sampled along separate quadrates in different vegetation. In 4 550 trap nights, we captured 300 individuals representing 28 species, 15 genera, 6 families and 3 orders. There were 19 species on the east slope, all of which belonged to the Oriental realm. There were 17 species on the west slope, 2 of which belonged to the Palaearctic realm, 14 of which belonged to the Oriental realm, and 1 of which is widely distribu- ted. The Himalayan-Hengduan mountains type is preponderant on both the east and the west slopes. The small mammals＇ species and quantity are the most in mountainside both the east and the west slope. The small mammals＇ combination and dominant species are different at different elevations and in different vegetation.