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Conditions Affecting Social Space in Drosophila melanogaster
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Group-level differences in social network structure remain repeatable after accounting for environmental drivers.

Mina Ogino1,2,3,4, Adriana A Maldonado-Chaparro1,2,3,5, Lucy M Aplin2,6

  • 1Department of Biology, University of Konstanz, Konstanz 78464, Germany.

Royal Society Open Science
|July 21, 2023
PubMed
Summary

Animal groups exhibit consistent social structures despite external factors. This study reveals that both social and non-social influences shape group behavior, with repeatable differences observed even after accounting for environmental variables.

Keywords:
environmentgroup-level behaviourpartitioningrepeatabilitysocial networkzebra finch

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Area of Science:

  • Behavioral Ecology
  • Animal Social Networks
  • Ethology

Background:

  • Individual behavior variation can lead to group-level differences.
  • Understanding how external factors shape social structures is crucial.
  • Consistent between-group differences in social structure are not well understood.

Purpose of the Study:

  • To investigate how social and non-social drivers influence group social structures.
  • To determine if animal groups exhibit consistent social structure differences after controlling for external drivers.
  • To partition variation in group-level social behavior.

Main Methods:

  • Automated tracking to quantify daily social interactions and association networks in 12 zebra finch colonies.
  • Quantified effects of five external drivers (group size, composition, ecological, physical, methodological) on network structure.
  • Tested for consistent between-group differences in network structure after controlling for external drivers.

Main Results:

  • External drivers significantly contribute to social network structure.
  • Consistent between-group differences in interaction networks were found (repeatability R: up to 0.493).
  • Consistent between-group differences in association networks were found (repeatability R: up to 0.736).

Conclusions:

  • Group-level social behavior variation can be attributed to distinct drivers.
  • Both social and non-social factors consistently contribute to between-group behavioral differences.
  • Animal groups maintain consistent social structures despite external influences.