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Mechanisms determining relationships between feeding group size and foraging success in food patch use by Japanese macaques (Macaca fuscata)

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/51738

Title: Mechanisms determining relationships between feeding group size and foraging success in food patch use by Japanese macaques (Macaca fuscata)
Authors: Kazahari, Nobuko Browse this author
Agetsuma, Naoki Browse this author →KAKEN DB
Keywords: feeding competition
feeding group size
foraging success
patch use
social monitoring
Issue Date: 2010
Publisher: Brill
Journal Title: Behaviour
Volume: 147
Issue: 11
Start Page: 1481
End Page: 1500
Publisher DOI: 10.1163/000579510X521573
Abstract: We evaluated the effects of social monitoring and feeding competition on foraging success in relation to the feeding group size of wild Japanese macaques (Macaca fuscata). Social monitoring is visual scanning by group members that assists them in following their own group. Individuals in smaller feeding groups may frequently use social monitoring while foraging, because they have an increased risk of losing their group. Therefore, social monitoring could be a cost for group-foraging animals. We made four predictions: (1) individuals in smaller feeding groups tend to abandon food patches to follow group members; (2) social monitoring frequency is higher in smaller feeding groups; (3) feeding rate decreases with increased social monitoring frequency; and (4) feeding rate initially increases with feeding group size because decreased social monitoring outweighs increased feeding competition, but after the feeding group reaches a certain size, feeding rate declines with increasing feeding group size due to the high costs of feeding competition. These predictions were supported by our results. Thus, the relationship between feeding group size and feeding rate can show three patterns (positive, neutral and negative) in response to the balance between the costs of social monitoring and feeding competition.
Type: article (author version)
URI: http://hdl.handle.net/2115/51738
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 揚妻 直樹

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