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Shared or unshared consensus decision in macaques?

C Sueur1, O Petit

  • 1Ethologie des Primates, Département d'Ecologie, Physiologie et Ethologie, France.

Behavioural Processes
|February 19, 2008
PubMed
Summary
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Collective decision-making differs between macaque species. Tonkean macaques show equally shared consensus, while rhesus macaques exhibit decisions led by dominant individuals, reflecting social structure influences.

Area of Science:

  • Primatology
  • Behavioral Ecology
  • Social Cognition

Background:

  • Collective decision-making is crucial for social species to synchronize activities.
  • Decision-making can be either shared, involving all members, or unshared, dominated by an individual.
  • Species' social style may influence their collective decision-making processes.

Purpose of the Study:

  • To investigate how social systems influence collective decision-making in primates.
  • To compare collective movement decisions in Tonkean macaques and rhesus macaques, species with contrasting social structures.

Main Methods:

  • Studied collective movement decisions in two macaque species: Tonkean macaque (Macaca tonkeana) and rhesus macaque (Macaca mulatta).
  • Observed and analyzed the participation of individuals in group movement decisions.

Related Experiment Videos

Main Results:

  • In both species, collective movement decisions involved multiple individuals.
  • Tonkean macaques exhibited consensus decisions involving nearly all group members.
  • Rhesus macaques showed consensus decisions where dominant and older individuals played a more prominent role.

Conclusions:

  • Tonkean macaques demonstrate equally shared consensus decisions for movement.
  • Rhesus macaques exhibit partially shared consensus decisions for movement.
  • Differences in collective decision-making are likely linked to the distinct social systems of these two macaque species.