Huang Pengzhen, He Xin, Zhang Endi, Chen Min
School of Life Sciences, East China Normal University, Shanghai, China.
Am J Primatol. 2017 May;79(5). doi: 10.1002/ajp.22636. Epub 2017 Jan 19.
It has been hypothesized that same-sex mounts can reflect the hierarchical relationship in a mounting dyad and it is widely deemed that mounting and being mounted are demonstrations of dominant and subordinate status, respectively. In this research, we aimed to test whether same-sex mounts function as dominance assertion in male golden snub-nosed monkeys (Rhinopithecus roxellana). We investigated this behavior in eight-individuals, captive all-male unit (AMU) in Shanghai wild animal park, China. Behavioral observations were conducted with a total of 1,855 mounts recorded from November, 2014 to June, 2015, during which the alpha male was replaced in the beginning of April. In support to the dominance assertion hypothesis, we found that during the entire study period the higher-ranking male was more likely to be the mounter than the lower-ranking one, except the mounts that happened among juveniles in peaceful and playful social contexts. Our study indicates that the hierarchical relationship of a mounting dyad can be influenced by the age-class of the participants and the social context where mounting occurs. We suggest that same-sex mounts might have different functions in different age groups and be multifunctional in a species.
据推测，同性爬跨行为能够反映爬跨二元组中的等级关系，并且人们普遍认为，爬跨和被爬跨分别代表着主导和从属地位。在本研究中，我们旨在测试同性爬跨行为在雄性川金丝猴（Rhinopithecus roxellana）中是否起到确立主导地位的作用。我们对中国上海野生动物园一个由八只雄性个体组成的圈养全雄单元（AMU）中的这种行为进行了调查。从2014年11月到2015年6月，我们共记录了1855次爬跨行为，并进行了行为观察，在此期间，4月初首领雄性被替换。为支持主导地位确立假说，我们发现，在整个研究期间，除了在和平且嬉戏的社交情境中幼猴之间发生的爬跨行为外，等级较高的雄性比等级较低的雄性更有可能成为爬跨者。我们的研究表明，爬跨二元组的等级关系可能会受到参与者年龄类别以及爬跨行为发生的社会情境的影响。我们认为，同性爬跨行为在不同年龄组中可能具有不同功能，并且在一个物种中可能具有多种功能。
