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Behavioural and hormonal changes during group formation by male chimpanzees

于Behaviour
著者:
Nobuyuki Kutsukake Department of Evolutionary Studies of Biosystems, Sokendai (the Graduate University for Advanced Studies), Hayama, Kanagawa 240-0193, Japan
Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan

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Migaku Teramoto Kumamoto Sanctuary, Wildlife Research Center, Kyoto University, Kumamoto 869-3201, Japan

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Seijiro Honma Aska Pharma Medical, Kawasaki 213-0033, Japan

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Yusuke Mori Kumamoto Sanctuary, Wildlife Research Center, Kyoto University, Kumamoto 869-3201, Japan

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Koki Ikeda Department of Cognitive and Behavioral Science, The University of Tokyo, Tokyo 153-8902, Japan

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Rain Yamamoto Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan

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Takafumi Ishida Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan

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Toshikazu Hasegawa Department of Cognitive and Behavioral Science, The University of Tokyo, Tokyo 153-8902, Japan

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Abstract

Group housing of socially-deprived individuals facilitates welfare and socialisation of primates. Here, we studied behavioural and hormonal changes in the course of group formation among nine male chimpanzees, Pan troglodytes. Aggression, reassurance, and grooming were observed in various dyads during group formation. The pattern of fluctuations in salivary cortisol level changed through the process of group formation, with particularly high cortisol levels immediately after group interactions relative to other sampling timings during group formation. Salivary testosterone levels were unaffected by the process of group formation or sampling time. These results suggested that a combination of behavioural observation and hormonal analyses is a powerful approach to assess the impact of group formation.

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