Abstract
This paper first reviews data collected from 1976 to 2013 regarding the life histories of members of the main E1 study group of bonobos (Pan paniscus) in Wamba. The E1 group exhibited strong tendencies toward female dispersal and male residence during the entire study period, thereby exemplifying the typical characteristics of a male-philopatric and female-dispersal society. This pattern did not change after the abandonment of artificial provisioning. We then present two new cases of immigrant females, focusing especially on social association patterns, dominance relationships, and affiliative interactions during the approximate 2.5 years from the time of their immigration to their first birth. These females began engaging in social grooming with resident females immediately after their arrival but rarely did so with adult males, suggesting that they regard social bonding with females as more important than that with males. They also emigrated at a young age and frequently engaged in social play. Indeed, social bonding established through frequent social play may be related to the development of socially symmetrical relationships, which are the basis for the egalitarian bonobo society. Intragroup competition for food and mates was unlikely explanations for the tendency toward female dispersal. However, male residence and the risk of father–daughter incest may encourage female transfer among bonobos.
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Acknowledgments
This study was financially supported by the Japan Ministry of the Environment Global Environment Research Fund (F-061 to Nishida; D-1007 to Furuichi), Japan Society for the Promotion of Science (JSPS) Grants-in-Aid for Scientific Research (21255006 to Ihobe; 22255007 to Furuichi), JSPS Asia–Africa Science Platform Program (2009–2011, 2012–2014 to Furuichi), JSPS HOPE project of the Primate Research Institute (PRI) of Kyoto University (to Matsuzawa), US Fish and Wildlife Service Assistance Award (96200-0-G017 to the African Wildlife Foundation), Ministry of Education, Culture, Sports, Science & Technology in Japan special grant (“Human Evolution”), and JSPS Grants-in-Aid for Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation (to PRI, Kyoto University). We thank Mr. I. Monkengo and Dr. N. Mwanza of the Research Center for Ecology and Forestry; Mr. F. Bukasa of the Ministry of Scientific Research and Technology in the DRC for research permits and logistical support; Mrs. B. Luunga, B. Bokamba, I. Bafanande, B. Likombe, N. Isoluka, E. Besao, and other workers and villagers at Wamba for collecting data and cooperating with our study; members of the Department of Biology of Meiji Gakuin University and PRI of Kyoto University; and the late Drs. T. Nishida, T. Matsuzawa, S. Kuroda, G. Idani, H. Ihobe, D. Kimura, C. Hashimoto, Y. Tashiro, and Y. Tsuji for support and encouragement.
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Sakamaki, T. et al. (2015). Intergroup Transfer of Females and Social Relationships Between Immigrants and Residents in Bonobo (Pan paniscus) Societies. In: Furuichi, T., Yamagiwa, J., Aureli, F. (eds) Dispersing Primate Females. Primatology Monographs. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55480-6_6
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