Arseneau-Robar T Jean M, Joyce Megan M, Stead Samantha M, Teichroeb Julie A
Anthropological Institute and Museum, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
Department of Anthropology, University of Toronto, 19 Russel Street, Toronto, ON, M5S 2S2, Canada.
Primates. 2018 May;59(3):267-279. doi: 10.1007/s10329-017-0643-6. Epub 2017 Dec 21.
Close proximity and social grooming are important bonding mechanisms in primates. These behaviors show the social structure of a species and many studies have found positive correlations between the degree of kinship and grooming and proximity. We used 1 year of data collected via instantaneous scan sampling on a large "supertroop" of Colobus angolensis ruwenzorii at Lake Nabugabo, Uganda, to examine partner preferences for grooming and nearest neighbors in each age-sex class. Little is known about this species, so we based our hypotheses on congeners. Of the five species of black-and-white colobus, data on sex-biased dispersal patterns are available for three (C. guereza, C. vellerosus, and C. polykomos), all of which show male-biased dispersal with occasional female dispersal. We thus predicted that female C. a. ruwenzorii would be more strongly bonded than males, showing greater proximity and grooming. We did not expect bonding between the sexes since congeners do not show this pattern. We found that among adult dyads, males and females were more likely to be found in loose proximity, and to groom, than would be expected given group composition. Conversely, both males and females had relatively weak same-sex relationships. Between the sexes, adult males had higher proximity and grooming indices with adult females without infants than with females with infants. These observations indicate that this subspecies is cross-bonded and that both sexes may disperse. Furthermore, our findings suggest that the social organization and social structure of C. a. ruwenzorii differ greatly from other black-and-white colobus species.
亲密接触和社交梳理是灵长类动物重要的联系机制。这些行为展现了一个物种的社会结构，许多研究发现亲缘关系程度与梳理行为和亲密接触之间存在正相关。我们利用通过瞬时扫描取样收集的、为期一年的数据，对乌干达纳布加博湖的一大群安哥拉疣猴鲁文佐里亚种进行研究，以考察每个年龄 - 性别组中梳理行为的伙伴偏好和最近邻。人们对这个物种知之甚少，所以我们基于同属物种提出假设。在黑白疣猴的五个物种中，有三个物种（东黑白疣猴、西非黑白疣猴和多毛黑白疣猴）有关于性别偏向扩散模式的数据，所有这些物种都表现出雄性偏向扩散，偶尔也有雌性扩散。因此，我们预测雌性安哥拉疣猴鲁文佐里亚种的联系会比雄性更强，表现出更亲密的接触和更多的梳理行为。我们预计两性之间不会有联系，因为同属物种没有这种模式。我们发现，在成年二元组中，与根据群体组成预期的情况相比，雄性和雌性更有可能处于松散的近距离状态并进行梳理。相反，雄性和雌性的同性关系都相对较弱。在两性之间，成年雄性与没有幼崽的成年雌性之间的亲密接触和梳理指数高于与有幼崽的雌性之间的指数。这些观察结果表明，这个亚种存在跨性别联系，并且两性都可能扩散。此外，我们的研究结果表明，安哥拉疣猴鲁文佐里亚种的社会组织和社会结构与其他黑白疣猴物种有很大不同。
