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Behavioral seasonality in mahale chimpanzees

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Abstract

To analyze how the chimpanzees in the Mahale Mountains National Park, Tanzania, change their grouping pattern, activity budget, travel speed, and travel distance within an annual cycle, I divided 1-year data into four periods. The Mahale chimpanzees have the behavioral flexibility to adapt to various climates and exhibited at least three behavioral seasons. In the early wet season, chimpanzees formed a few, large parties, and spent much time feeding on insects and animal meat. In the early and late dry seasons, chimpanzees maintained party sizes as large as in the early wet season, and traveled distances similar to the early wet season, but spent the most time feeding and traveling within the year. By contrast, in the late wet season chimpanzee parties broke up into more numerous, small groups, and traveled slowly over shorter distances. Although time spent feeding and traveling were the same as that in the early wet season, time spent feeding on terrestrial herbaceous vegetation (THV) was the highest in the year. The results suggest that chimpanzees travel longer, faster, and farther in seasons when they form large parties.

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  1. Human Evolution Studies, Department of Zoology, Division of Biological Sciences, Kyoto University, Sakyo, 606-8502, Kyoto, Japan

    Akiko Matsumoto-Oda

  2. Department of Anthropology, Rutgers University, 131 George Street, 08901-1414, New Brunswick, New Jersey, U. S. A.

    Akiko Matsumoto-Oda

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Matsumoto-Oda, A. Behavioral seasonality in mahale chimpanzees. Primates 43, 103–117 (2002). https://doi.org/10.1007/BF02629670

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