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Environmental variability supports chimpanzee behavioural diversity.

Ammie K Kalan1, Lars Kulik2, Mimi Arandjelovic2

  • 1Max Planck Institute for Evolutionary Anthropology, 04103, Leipzig, Germany. ammie_kalan@eva.mpg.de.

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|September 16, 2020
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Summary
This summary is machine-generated.

Environmental variability drives behavioral diversity in wild chimpanzees. Greater habitat unpredictability, both recent and historical, correlates with a wider range of behaviors, including tool use, suggesting a key evolutionary force.

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Area of Science:

  • Primate Behavior
  • Evolutionary Anthropology
  • Conservation Biology

Background:

  • Large brains and behavioral innovation are linked to adaptability in changing environments.
  • Ecological challenges are hypothesized drivers of human evolution, yet within-species diversity is understudied.
  • Population diversification is thought to precede genetic divergence and speciation.

Purpose of the Study:

  • To investigate the relationship between environmental variability and behavioral diversity in wild chimpanzees (Pan troglodytes).
  • To determine if environmental factors influence the number and type of behavioral traits observed within chimpanzee populations.

Main Methods:

  • Utilized a dataset encompassing 144 wild chimpanzee communities.
  • Analyzed behavioral diversity in relation to both recent and historical environmental variability.
  • Assessed the association between distance from Pleistocene forest refugia and the presence of behavioral traits.

Main Results:

  • Chimpanzees displayed greater behavioral diversity in environments with higher variability across recent and historical timescales.
  • Distance from Pleistocene forest refugia was linked to a larger repertoire of behavioral traits, including tool and non-tool use.
  • Over half of the observed behaviors were identified as likely cultural.

Conclusions:

  • Environmental variability is a significant factor promoting behavioral and cultural diversification in wild chimpanzees.
  • These findings support the hypothesis that environmental pressures were critical evolutionary forces in great ape diversification.
  • The study highlights the importance of considering environmental context when examining behavioral and genetic diversity in wild populations.