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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/373

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Title: Analysing the effects of group size and food competition on Japanese macaque social relationships
Authors: Majolo, Bonaventura
Ventura, Raffaella
Koyama, Nicola F.
Hardie, Scott M.
Jones, Bethan M.
Knapp, Leslie A.
Schino, Gabriele
Affiliation: University of Abertay Dundee. School of Social and Health Sciences
Keywords: Aggression
Grooming
Kinship
Rank
Reconciliation
Issue Date: 2009
Publisher: Brill Academic Publishers
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Brill Academic Publishers, available from DOI: 10.1163/156853908X390959
Citation: Majolo, B., et al. 2009. Analysing the effects of group size and food competition on Japanese macaque social relationships. Behaviour. 146(1): pp.113-137. Available from: DOI: 10.1163/156853908X390959
Abstract: Socio-ecological models predict group size to be one major factor affecting the level of food competition. The aims of this study were to analyse how grooming distribution and reconciliation were affected by differences in group size and food competition in a habitat where predation risk is absent. Data were collected on two groups of different size of wild Japanese macaques (Macaca fuscata yakui), living on Yakushima Island, Japan. The large group faced a greater level of intra-group scramble and a lower level of inter-group food competition. However, intra-group food competition appeared to be greater in the small group as evidenced by the stronger rank-related effects on diet composition in the small group. Grooming and reconciliation were more matrilineally kin-biased and more directed toward close-ranking monkeys in the small group than in the large group. Reconciliation was more frequent in the small group, but monkeys in the large group spent more time grooming and had a greater number of grooming partners. These results indicate that social relationships within the two groups were the result of the combination of group size differences and of the balance between the benefits and costs of a lower/greater level of inter- and intra-group food competition.
URI: http://hdl.handle.net/10373/373
ISSN: 0005-7959
Appears in Collections:Social & Health Sciences Collection

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