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Related Experiment Videos

Changes in unit structures and infanticide observed in Arsi geladas.

Akio Mori1, Gurja Belay, Toshitaka Iwamoto

  • 1Primate Research Institute, Kyoto University, Kanrin, Inuyama, Aichi 484-8506, Japan. mori@pri.kyoto-u.ac.jp

Primates; Journal of Primatology
|July 29, 2003
PubMed
Summary

Arsi gelada baboons exhibit highly dynamic social structures with frequent unit changes, possibly due to smaller group sizes. This study observed significant social shifts, including leadership changes and unit formations, in Theropithecus gelada.

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Area of Science:

  • Primatology
  • Ethology
  • Zoology

Background:

  • A new population of gelada baboons (Theropithecus gelada) was identified in Arsi, distinct from established Semien and Showa populations.
  • Previous observations suggested Arsi gelada units display less stable structures compared to Semien populations.

Purpose of the Study:

  • To investigate the processes and dynamics of social changes within Arsi gelada units.
  • To understand the factors influencing unit structure stability and change in this newly discovered population.

Main Methods:

  • A 7-month observational study of gelada units at Gado-Goro, Arsi.
  • Provisioning was used for initial capture and blood sampling, followed by behavioral observation.
  • Detailed recording of social interactions, unit composition changes, and leadership transitions.

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Main Results:

  • Observed significant changes in unit structure, including leadership changes, female transfers, and new unit formations.
  • Documented one successful and one attempted unit unification, and one instance of a leader male change.
  • Recorded higher frequencies of social changes in Arsi geladas compared to Semien populations, potentially linked to smaller unit sizes.
  • Reported cases of infanticide and abortion coinciding with social changes.

Conclusions:

  • Arsi gelada social organization is characterized by high plasticity and frequent changes.
  • Smaller unit sizes may contribute to the observed instability and rapid social dynamics.
  • The findings provide insights into the adaptability and social evolution of Theropithecus gelada populations.