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International Journal of Primatology

, Volume 33, Issue 5, pp 1038–1053 | Cite as

Comparisons of Intraunit Relationships in Nonhuman Primates Living in Multilevel Social Systems

  • Ikki Matsuda
  • Peng Zhang
  • Larissa Swedell
  • Umeyo Mori
  • Augustine Tuuga
  • Henry Bernard
  • Cédric Sueur
Article

Abstract

Multilevel social systems have evolved in several species of cercopithecoid primates and appear to be an effective means of changing group size amid variation in environmental conditions. Larger groupings of these species fission and fuse, making intraunit relationships essential to maintain the integrity of the smallest social units. We examine these intraunit relationships in four primates with multilevel social systems: proboscis monkeys (Nasalis larvatus), snub-nosed monkeys (Rhinopithecus roxellana), hamadryas baboons (Papio hamadryas), and geladas (Theropithecus gelada), using social network analysis. The proboscis monkeys and hamadryas baboons were wild and unprovisioned, whereas the snub-nosed monkeys and geladas were partly provisioned. Comparison of eigenvector centrality coefficients revealed a phylogenetic difference in the key individuals maintaining social networks between the colobines and the cercopithecines: females were more central in proboscis and snub-nosed monkeys, with males generally peripheral to social interaction, whereas males were more central than females in geladas and hamadryas. A comparison of sex differences in clustering coefficients, however, revealed a significant difference only in geladas, suggesting that one-male–multifemale units in this species become more unstable when females, but not males, are removed from social networks. Taken together, our results reveal the strongest differences between geladas, characterized by female philopatry and male dispersal, and the three species with bisexual dispersal. These results demonstrate the potential for social network analysis to reveal the social bonds most important for maintaining cohesion of the smallest units of primate multilevel societies. This, in turn, can serve as a proxy, in the absence of long-term data, for underlying patterns of sex-biased dispersal and philopatry.

Keywords

Gelada Hamadryas baboon Proboscis monkey Snub-nosed monkey Social network analysis Social organization 

Notes

Acknowledgments

I. Matsuda, A. Tuuga, and H. Bernard thank the Economic Planning Unit of the Malaysian Government, the Sabah Wildlife Department and the Sabah Forestry Department staff, the Kinabatangan Orangutan Conservation Project, and our research assistants for support. I. Matsuda truly appreciates Y. Matsuda for supporting his field work. I. Matsuda thanks a Grant-in-Aid for challenging Exploratory Research (24657170) and HOPE and Human Evolution Project of KUPRI for funding support in the field. P. Zhang thanks Zhouzhi Nature Reserve for giving him permission to conduct this research and to National Natural Science Foundation of China (31000175), the Scientific Research Foundation for the Returned Overseas Chinese Scholars and Resona-Asia-Oceania Foundation for funding support in the field. L. Swedell and U. Mori thank the Ethiopian Wildlife Conservation Authority for permission to conduct this research, and L. Swedell thanks the National Geographic Society, the Leakey Foundation, the Wenner-Gren Foundation, and the National Science Foundation for funding to support research at Filoha, Ethiopia. Finally, we thank C. Grüter, J. Setchell, and two anonymous reviewers for their helpful comments that improved this manuscript. Data collection for this study was carried in accordance with protocols approved by the Economic Planning Unit, Prime Minister’s Department, Putrajaya, Malaysia and the Sabah Wildlife Department, Sabah, Malaysia (proboscis monkeys); the Zhouzhi National Reserve, China (snub-nosed monkeys); and the Wildlife Conservation Authority (formerly the Wildlife Conservation Organization) of Ethiopia (geladas and hamadryas baboons). All protocols adhere to the legal requirements of Malaysia, China, and Ethiopia, respectively.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Ikki Matsuda
    • 1
  • Peng Zhang
    • 2
  • Larissa Swedell
    • 3
    • 4
  • Umeyo Mori
    • 5
  • Augustine Tuuga
    • 6
  • Henry Bernard
    • 7
  • Cédric Sueur
    • 8
    • 9
  1. 1.Long-term Field Study Project, Primate Research InstituteKyoto UniversityInuyamaJapan
  2. 2.Anthropology DepartmentSun Yat-sen UniversityGuang ZhouChina
  3. 3.Department of Anthropology, Queens CollegeCity University of New YorkFlushingUSA
  4. 4.New York Consortium in Evolutionary PrimatologyNew YorkUSA
  5. 5.Nagoya Bunri UniversityInazawaJapan
  6. 6.Sabah Wildlife DepartmentSabahMalaysia
  7. 7.Institute for Tropical Biology and ConservationUniversiti Malaysia SabahSabahMalaysia
  8. 8.Centre National de la Recherche Scientifique, Départment EcologiePhysiologie et EthologieStrasbourgFrance
  9. 9.Institut Pluridisciplinaire Hubert CurienUniversité de StrasbourgStrasbourgFrance

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