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Captive chimpanzee shares food with baboons

Current Zoology 2024年第5期70卷 682-684页

作者： Bin Yang James R.Anderson Ni-Na Gou Kai-Feng Wang Bao-Guo Li Shaanxi Key Laboratory of Qinling Ecological Security Shaanxi Key Laboratory for Animal ConservationShaanxi Institute of ZoologyXi’an710032China Department of Psychology Kyoto University Graduate School of LettersKyoto606-8501Japan Shaanxi Key Laboratory for Animal Conservation and College of Life SciencesNorthwest UniversityXi’an 710069China

Food sharing is a prosocial behavior consisting of the unresisted transfer of monopolizable food from a possessor to another individual(Feistner and McGrew 1989;Stevens and Gilby 2004).Despite the cost for donors(i.e.,loss of the food),intraspecifc food sharing occurs in various insects,fsh,birds,and aquatic,terrestrial,and arboreal mammals(Liévin‐Bazin et al.2019;Carter et al.2020).By far,most food sharing is intraspecifc,and takes place while possessors are in the process of ***,we describe the remarkable case of a captive chimpanzee,Pan troglodytes,regularly dispensing food to another primate species(baboons,Papio hamadryas)in a neighboring *** discuss likely causes and functions of this interspecifc altruistic *** were made in Xi’an Qinling Wildlife Park,Shaanxi Province,China(34°02ʹ56.22″N,108°51ʹ48.60″E),where two adult chimpanzees and a group of around 40-50 baboons lived in adjacent *** female chimpanzee(AiAi)was the elderly mother of the male(DuoDuo,or DD).At feeding times,AiAi usually ate near the door to the chimpanzees’indoor area,and she almost never interacted with the baboon *** baboon group consisted of two one-male *** recorded behaviors using focal-animal sampling(for information about subjects and methods,see Supplementary Materials).

关键词： baboons chimpanzee food sharing

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Knockouts of high-ranking males have limited impact on baboon social networks

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Current Zoology 2015年第1期61卷 107-113页

作者： Mathias FRANZ Jeanne ALTMANN Susan C. ALBERTS Department of Biology Duke University Durham NC 27708-0719 USA Department of Ecology and Evolutionary Biology Princeton University Princeton NJ 08544-2016 USA

Social network structures can crucially impact complex social processes such as collective behaviour or the transmission of information and diseases. However, currently it is poorly understood how social networks change over time. Previous studies on primates suggest that ＇knockouts＇（due to death or dispersal） of high-ranking individuals might be important drivers for structural changes in animal social networks. Here we test this hypothesis using long-term data on a natural population of ba- boons, examining the effects of 29 natural knockouts of alpha or beta males on adult female social networks. We investigated whether and how knockouts affected （i） changes in grooming and association rates among adult females, and （2） changes in mean degree and global clustering coefficient in these networks. The only significant effect that we found was a decrease in mean degree in grooming networks in the first month after knockouts, but this decrease was rather small, and grooming networks re- bounded to baseline levels by the second month after knockouts. Taken together our results indicate that the removal of high-ranking males has only limited or no lasting effects on social networks of adult female baboons. This finding calls into question the hypothesis that the removal of high-ranking individuals has a destabilizing effect on social network structures in social animals [Current Zoology 61 （1）： 107-113, 2015].

关键词： Social network analysis Social network dynamics Knockouts baboons

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