Effects of human activity on chimpanzee wounding

Abstract

Reducing the frequency and/or severity of aggression and wounding is a major concern of people managing socially housed chimpanzees. One factor that has not been investigated intensively for its effect on captive chimpanzee agonism is the presence of humans. Therefore, we examined an archival database of wounding incidents among 88 adult and adolescent members of 8 social groups of chimpanzees (42 females, 46 males) to determine whether variable levels of human activity (higher weekday versus lower weekend-day activity levels) in the colony was associated with changes in chimpanzee wounding patterns. Wounding was tabulated for each group for periods of 38 - 118 months. A series of Chi-square tests indicated that there were a greater than expected number of wounding episodes on weekdays but that day of the week did not affect the age or sex distribution of wounding. Together, these results suggest that the presence of personnel completing routine activities is associated with chimpanzee agonism. Zoo Biol 16:327–333, 1997. © 1997 Wiley-Liss, Inc.

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