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Group structure predicts variation in proximity relationships between male-female and male-infant pairs of mountain gorillas (Gorilla beringei beringei).

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Group structure predicts variation in proximity relationships between male-female and male-infant pairs of mountain gorillas (Gorilla beringei beringei).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rosenbaum, S. Maldonado-Chaparro, A. A. Stoinski, T. S.
Spatial Coverage	Rwanda
Description	Country affiliation: United States Author Affiliation: Rosenbaum S ( Department of Anthropology, University of California-Los Angeles, Los Angeles, CA, USA. srosenbaum@uchicago.edu.); Maldonado-Chaparro AA ( Institute for Mind and Biology, University of Chicago, 940 East 57th Street, Chicago, IL, 60637, USA. srosenbaum@uchicago.edu.); Stoinski TS ( Department of Ecology and Evolutionary Biology, University of California-Los Angeles, Los Angeles, CA, USA.)
Abstract	Relationships between conspecifics are influenced by both ecological factors and the social organization they live in. Systematic variation of both--consistent with predictions derived from socioecology models--is well documented, but there is considerable variation within species and populations that is poorly understood. The mountain gorilla (Gorilla beringei) is unusual because, despite possessing morphology associated with male contest competition (e.g., extreme sexual dimorphism), they are regularly observed in both single-male and multimale groups. Both male-female and male-infant bonds are strong because males provide protection against infanticide and/or predation. Risk of these threats varies with social structure, which may influence the strength of social relationships among group members (including females and offspring, if females with lower infant mortality risk are less protective of infants). Here, we investigate the relationship between group structure and the strength of proximity relationships between males and females, males and infants, and females and offspring. Data come from 10 social groups containing 1-7 adult males, monitored by the Dian Fossey Gorilla Fund's Karisoke Research Center in Volcanoes National Park, Rwanda. After controlling for group size and infant age, association strength was similar for male-female pairs across group types with both dominant and nondominant males, but male-infant relationships were strongest in single-male groups where paternity certainty was high and animals had fewer social partners to choose from. The male:female and male:infant ratios better predicted both male-female and male-infant associations than the absolute number of males, females, or infants did. The fewer the number of males per female or infant, the more both pair types associated. Dominant males in groups containing fewer males had higher eigenvector centrality (a measure of importance in a social network) than dominant males in groups with more males. Results indicate that nondominant males are an important influence on relationships between dominant males and females/infants despite their peripheral social positions, and that relationships between males and infants must be considered an important foundation of gorilla social structure.
File Format	HTM / HTML
ISSN	00328332
Issue Number	1
Volume Number	57
e-ISSN	16107365
Journal	Primates
Language	English
Publisher	Springer
Publisher Date	2016-01-01
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Zoology Gorilla Gorilla Physiology Social Behavior Animals Female Group Structure Male Rwanda Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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