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Analysing the effects of group size and food competition on Japanese macaque social relationships

Analysing the effects of group size and food competition on Japanese macaque social relationships
Analysing the effects of group size and food competition on Japanese macaque social relationships
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.
0005-7959
113-137
Majolo, Bonaventura
d9922601-9ada-4441-ab43-b3514081d156
Ventura, Raffaella
7e750ee1-8821-4c8a-b58d-c85feaf7b9a5
Koyama, Nicola F.
d8927d7e-28a1-4d7b-8e51-1a9f68ca1080
Hardie, Scott M.
d79dc800-04ac-4d00-a04a-712f4f2598cd
Jones, Bethan M.
2a40cabe-e5ee-4454-8aab-585c3af9fa70
Knapp, Leslie A.
1b4bc671-2fc7-47f7-bccb-231fbd5cfd20
Schino, Gabriele
859bab9a-f260-4b8e-a75e-0300b21f3741
Majolo, Bonaventura
d9922601-9ada-4441-ab43-b3514081d156
Ventura, Raffaella
7e750ee1-8821-4c8a-b58d-c85feaf7b9a5
Koyama, Nicola F.
d8927d7e-28a1-4d7b-8e51-1a9f68ca1080
Hardie, Scott M.
d79dc800-04ac-4d00-a04a-712f4f2598cd
Jones, Bethan M.
2a40cabe-e5ee-4454-8aab-585c3af9fa70
Knapp, Leslie A.
1b4bc671-2fc7-47f7-bccb-231fbd5cfd20
Schino, Gabriele
859bab9a-f260-4b8e-a75e-0300b21f3741

Majolo, Bonaventura, Ventura, Raffaella, Koyama, Nicola F., Hardie, Scott M., Jones, Bethan M., Knapp, Leslie A. and Schino, Gabriele (2009) Analysing the effects of group size and food competition on Japanese macaque social relationships. Behaviour, 146 (1), 113-137. (doi:10.1163/156853908X390959).

Record type: Article

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.

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Published date: 2009

Identifiers

Local EPrints ID: 65435
URI: http://eprints.soton.ac.uk/id/eprint/65435
ISSN: 0005-7959
PURE UUID: c662e37c-5b0c-45b3-ae27-8791df8d1193

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Date deposited: 26 Oct 2009
Last modified: 19 Jul 2019 23:53

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