广西岜盆白头叶猴的种群动态

THE POPULATION DYNAMICS OF THE WHITE HEADED LANGUR PRESBYTIS LEUCOCEPHALUS IN BAPEN

１９９６年９月至１９９７年６月，作者对广西岜盆自然保护区白头叶猴的种群数量进行了调查．结果表明：岜盆保护区现有白头叶猴１３６只，分属１９个两性群、５个独雄群和１个双雄群平均群大小５４４只／群，群密度０２６群／ｋｍ２，种群密度１４４只／ｋｍ２白头叶猴的年龄组成为：成年猴８０只，占５８８２％，青年猴３６只，占２６４７％，幼猴２０只，占１４７１％与他人１９８７年的报道相比，１０年间该区白头叶猴的种群数量下降了５９８８％，种群密度下降了６６０４％，平均群大小下降了３９０１％。

From September 1996 to June 1997, the survey on the population of the white headed langur in Bapen Nature Reserve was being conducted. The data show that there are 136 individuals (19 bisexual groups, 5 solitary old males and a pair of young males) in Bapen and the mean group size is 5.44 Ind/gr, the group density 0.26gr./km 2, and the population density 1.44 Ind./km 2. The population contains 80 adults, 36 subadults and 20 infants with the percentage of 58.82% , 26.47%, and 14.71% respectively. Compared to the data from 1987,the population has decreased by 59.88% over the past ten years, while the population density decreased by 66.04% and means group size by 39.01% ,with 19 groups apparently disappearing from the Reserve. The main factors for these are probally the destruction and isolation of the habitat.