Cui Liang-Wei, Huo Sheng, Zhong Tai, Xiang Zuo-Fu, Xiao Wen, Quan Rui-Chang
Faculty of Conservation Biology, Southwest Forestry College, Kunming, People's Republic of China.
Am J Primatol. 2008 Feb;70(2):169-74. doi: 10.1002/ajp.20471.
Data on social organization of two bands of black-and-white snub-nosed monkeys (Rhinopithecus bieti) were collected when the monkeys were crossing an open spot at Nanren and Bamei (northwest of Yunnan, China) using a sampling rule where individuals within one social unit are spatially closer to each other than individuals between social units. The typical pattern of social organization in this sample was multiple adult females (AFs) and their offspring with one adult male (AM) in a one-male unit (OMU), similar to that of many other colobines. In such units, on average one male is associated with 4.0 AFs and 2.5 of their offspring. Moreover, there are multimale/multifemale units and monogamous units besides OMUs. All bisexual units traveled together with at least one all-male unit as a cohesive band. In two bands of monkeys, 87% of AMs in bisexual units were within OMUs, 7.8% within monogamous units and 5.2% within multimale, multifemale units. In the Bamei band, 6.7% of AMs were in the all-male unit. The size of OMUs in the Nanren band was larger than that of the Bamei band, with more AFs and juveniles, which may be related to better conservation in the Nanren band's habitat. For the Nanren band, the average number of AFs in OMUs varied across time, increasing from 4.3 in 1994 to 5.1 in 2001, and then decreasing to 3.8 in 2005. This article suggests three possible explanations for this variation, but more data are needed for these hypotheses to be tested.
在黑白仰鼻猴（滇金丝猴）的两个种群穿越中国云南西北部南仁和巴美开阔地带时，依据一个抽样规则收集了有关社会组织的数据，该规则为：同一社会单元内的个体在空间上比不同社会单元的个体彼此间靠得更近。此样本中社会组织的典型模式是在单雄单元（OMU）中有多只成年雌性（AF）及其后代，还有一只成年雄性（AM），这与许多其他叶猴类相似。在这样的单元中，平均一只雄性与4.0只成年雌性及其2.5只后代相关联。此外，除了单雄单元外，还有多雄多雌单元和一夫一妻制单元。所有两性单元都与至少一个全雄单元一起作为一个紧密群体活动。在两个猴群中，两性单元中87%的成年雄性在单雄单元内，7.8%在一夫一妻制单元内，5.2%在多雄多雌单元内。在巴美猴群中，6.7%的成年雄性在全雄单元内。南仁猴群中单雄单元的规模比巴美猴群的大，有更多成年雌性和幼猴，这可能与南仁猴群栖息地更好的保护状况有关。对于南仁猴群，单雄单元中成年雌性的平均数量随时间变化，从1994年的4.3只增加到2001年的5.1只，然后在2005年降至3.8只。本文针对这种变化提出了三种可能的解释，但需要更多数据来检验这些假设。
