Journal
INTERNATIONAL JOURNAL OF PRIMATOLOGY
Volume 39, Issue 4, Pages 685-704Publisher
SPRINGER
DOI: 10.1007/s10764-018-0058-2
Keywords
Food competition; Intergroup relationship; Luo scientific reserve; Multigroup association; Seasonality; Sexual swelling
Categories
Funding
- Japanese Ministry of the Environment Global Environment Research Fund [D-1007]
- Japan Society for the Promotion of Science (JSPS) [26257408, 22255007, 25304019, 16H02753, 25257407]
- JSPS Core-to-Core Program (2009-2011)
- JSPS HOPE Project of the PRI of Kyoto University
- US Fish and Wildlife Service Assistance Award [96200-0-G017]
- Ministry of Education, Culture, Sports, Science, and Technology in Japan Special Grant (Human evolution)
- JSPS Strategic Young Overseas Visits Program for Accelerating Brain Circulation [S2508]
- JSPS Core-to-Core Program (2012-2014)
- JSPS Core-to-Core Program (2015-2017)
- Grants-in-Aid for Scientific Research [26257408, 25304019] Funding Source: KAKEN
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Intergroup interactions in primates vary from nonagonistic to severely aggressive. Food resources and fertile females cause intergroup aggression when groups defend resources and mates from other groups. Peaceful intermingling during intergroup encounters is rare but has been reported in several primates, including bonobos (Pan paniscus). Although intergroup encounters in bonobos occur at both nonprovisioned and provisioned sites, provisioning may be one factor responsible for frequent intergroup encounters. We studied intergroup encounters between one bonobo group (PE) and its neighboring groups, one semihabituated and two habituated groups, under nonprovisioned conditions in 2010-2015 at Wamba, Democratic Republic of Congo. We examined whether fruit abundance and females with sexual swellings influenced encounter frequency. PE group encountered the other groups on 7.1 days (mean, range: 0-19) per month. Up to four different groups met simultaneously at one location. Encounter frequency was highest around the yearly peak in fruit abundance, suggesting that reduced food competition is linked to increased encounter frequency. During periods of relatively low fruit abundance, the probability of an encounter was higher when a higher number of adult females with maximum sexual swellings were present, suggesting that the attractiveness of females with sexual swellings promoted group encounters during periods of relatively low fruit abundance. These findings suggest that both competition for food and the availability of females with sexual swellings influence encounter frequency in bonobos.
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