Abstract # 13125 Poster # 60:

Scheduled for Thursday, August 9, 2018 06:00 PM-08:00 PM: (Chula Vista ) Poster Presentation


SOCIAL HAIR PLUCKING IN CAPTIVE BONOBOS (PAN PANISCUS) IS UNRELATED TO DOMINANCE AND KINSHIP

 
 

C. M. Brand1 and L. F. Marchant2
1Department of Anthropology, University of Oregon, Eugene, OR 97403, USA, 2Department of Anthropology, Miami University
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Hair plucking is observed in many captive primate species and is often characterized as an abnormal behavior. However, this behavior can be both self-directed and social and may have different etiologies. Earlier research in captive macaques (Macaca mulatta) described the aggressive nature of social hair plucking while more recent observations did not find an association with aggression yet the behavior was directed down the dominance hierarchy. Here, we investigate patterns of social hair plucking in a group of captive bonobos at the Columbus Zoo. As social hair plucking rarely occurs outside of grooming, we tested the hypothesis that plucking is a grooming convention in this social group. We collected 128 hours of grooming data on 16 captive bonobos using all-occurrence sampling. We ran Mantel tests for both symmetrical and asymmetrical grooming and plucking matrices. We also considered how dominance and kinship affected the target of social hair plucking using a two-way ANOVA. Grooming and hair plucking distributions were significantly correlated (asymmetrical z = 4636, p < 0.001, symmetrical: z = 6620, p < 0.001) and there was no effect of dominance (F = 0.14, ns), kinship (F = 1.67, ns), or interaction between dominance and kinship (F = 0.51, ns) on social plucking. These results support the hypothesis that social plucking in bonobos is a grooming convention and is unrelated to welfare.