Srivastava A, Biswas J, Das J, Bujarbarua P
Indo-U.S. Primate Project, Northeast Centre, Guwahati, India.
Am J Primatol. 2001 Sep;55(1):15-23. doi: 10.1002/ajp.1035.
The distribution of golden langurs (Trachypithecus geei) is limited to a small area of western Assam in northeast India and Bhutan between the rivers Manas in the east, Sankosh in the west, and Brahmaputra in the south. It is one of the most seriously endangered primate species of India. A comparative analysis based on satellite images taken in 1988 and 1998 showed a 50% loss of original golden langur habitat. Data on population dynamics collected using line transect and total count methods are presented here. An average group size of 8.2 (range 4.0-22.0) individuals was recorded. A total of 1,064 individuals were counted living in 130 groups. The sex ratio was 1.9-2.5 adult females for each adult male. A low percentage of juveniles and infants suggests that the population is unstable. Most of the groups had only one adult male. Small group sizes, isolated distribution, proportionately few infants and juveniles, and degrading habitat are all causes of concern. Demographic trends indicate a decline in the golden langur population.
金色叶猴（Trachypithecus geei）的分布范围仅限于印度东北部阿萨姆邦西部的一小片区域以及不丹，其东部以玛纳斯河为界，西部以桑科什河为界，南部以布拉马普特拉河为界。它是印度最濒危的灵长类物种之一。基于1988年和1998年拍摄的卫星图像进行的对比分析显示，金色叶猴的原始栖息地丧失了50%。本文展示了使用样线法和全计数法收集的种群动态数据。记录到平均群体规模为8.2只个体（范围为4.0 - 22.0只）。总共统计到130个群体中的1064只个体。成年雌雄比例为每只成年雄性对应1.9 - 2.5只成年雌性。幼年和婴儿个体的比例较低，这表明种群不稳定。大多数群体只有一只成年雄性。群体规模小、分布孤立、婴幼儿比例相对较少以及栖息地退化都是令人担忧的因素。人口统计学趋势表明金色叶猴种群数量在下降。
