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Conditions Affecting Social Space in Drosophila melanogaster
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Social network changes during space restriction in zoo chimpanzees.

Nicola F Koyama1, Filippo Aureli2,3

  • 1Research Centre in Evolutionary Anthropology and Palaeoecology, Liverpool John Moores University, Liverpool, UK. n.f.koyama@ljmu.ac.uk.

Primates; Journal of Primatology
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Summary

Chimpanzees reduced grooming partners during space restriction, indicating a conflict avoidance strategy. This study reveals how social networks dynamically adapt to environmental changes.

Keywords:
AggressionCoping modelCrowdingGrooming

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Area of Science:

  • Primate social behavior
  • Ethology
  • Animal social networks

Background:

  • Primates employ behavioral strategies to manage conflict risk during space restriction.
  • Previous research focused on individual or dyadic interactions, overlooking group-level social structures.
  • Group-living animals' social networks are crucial for understanding responses to environmental changes.

Purpose of the Study:

  • To investigate changes in social structure and individual connectedness in chimpanzees during space restriction using a network approach.
  • To analyze how network density and centrality measures are affected by reduced space.

Main Methods:

  • Collected grooming and aggression data from a group of zoo chimpanzees over a control and a space restriction period.
  • Utilized a network analysis approach, comparing network density and individual centrality (degree, eigenvector, betweenness) between periods.
  • Employed permutation tests to assess the statistical significance of observed changes.

Main Results:

  • The unidirectional grooming network density significantly decreased during space restriction, indicating fewer grooming partners and reduced network cohesion.
  • Females showed a reduction in grooming partners (degree) and an increase in betweenness centrality.
  • No significant changes were observed in mutual grooming or aggression networks.

Conclusions:

  • Findings support a conflict avoidance strategy in chimpanzees responding to space restriction.
  • The study highlights the dynamic and flexible nature of social structures in adapting to environmental challenges.
  • Network analysis provides novel insights into group-level responses complementing individual behavioral observations.