关键词: 扭角羚, 兽群结构, 兽群动态, 分布

Abstract: There are 4 subspecies of takin，two subspceies，Sichuan takin and golden takin．exist onlyin our country．Little information is known about the takin in the wild．In order to protect this rare ungulate．it is necessory to study it in the wild．From July 1985，to January 1987，We studied the Sichuan takin (Budorcas taxicolor tibetana) in Tangjiahe Natural Reserve in the Min Mountains of Northern Sichuan Province．We gathered some new informations councerning herd compositions，population dynamics and desity as follows：
Thereare two ways for takin to live，one is in solitary(♂) ，another is in herd．Most solitary males are old ones which are thought to have lost the ability to take part in mating competition．But a few of them have the ability fox mating competition．Sometimes we can find out the takin herd when we follow the solitary males．
Herds comprise of young，subadults and adults．The herdsizes vary from 5to 130
individuals (Table 1 and 2)．By observing 51 herds of takin，we find that most herds
comprise 10 to 45 individuals (60.80% of the tota1)，and the mean herd size is 39.61(S.D:31.93)．
The herd consists of young (both Sexes，17.52±6.48% of the tota1)，subadults(both Sexes， 17.25±9.16% of the tota1) and adults (all females and a few males，65.23±12.59% of the tota1)．In the adults of the herd，the sex ratio(male to female) is about 1 to 2，this is because that some other males a solitary form small male herds．
From winter to mid—spring，about 3 to 6 herds often gather together to form a large herd called a "gathering herd" and generally comprise over 60 individuals．We saw a large gathering herd of 127 to 130 takins in spring．The herd may have gathered for the food supply and warding off the predators such as the leopard (Panthera pardus)and the Asiatic wild dog (Cuon alpinus) in Tangjaihe Natural Reserve．
As the takin have a high reproductive potential (table 1)．the population will increase rapidly in a protected area．In Tangjiahe Natural Reserve，with a area of 400
square kilometers，there are 480 to 520 takins， i,e1.2 to1.3 takins per square kilometer。Those takins are divided into 4 gathering herd ，being found in 4 different mountains area(Fig,2).area (Fig．2)．

Key words: Takin, Herd compositions, Herd dynamics, Distribution