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Life history of hamadryas baboons: Physical development, infant mortality, reproductive parameters and family relationships

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Abstract

Demographic and life history parameters were estimated for a band of free-ranging hamadryas baboons, observed for 5.5 years in Ethiopia. Age-related changes in body weight and dentition were found to be delayed relative to laboratory-reared baboons. On the average, females reached menarche at 4.3 years of age and had their first infant at the age of 6.1 years. The mean interbirth interval was 24 months if the infant survived this period. The survival of infants and juveniles was higher compared to Amboseli yellow baboons, but somewhat lower than in gelada baboons in the Simen Mountains. Males acquired their first juvenile or adult female at the age of 8.5 to 11 years. Male-female pair-bonds lasted several years in most cases. The Cone Rock baboons were organized in a four-level social structure. The troop could split into bands, bands were divided into clans, and clans into one-male units with bachelor followers. The exchange of individuals between social units predominantly occurred within the band. All males of known origin became adult members of their presumed natal clan. Most females transferred also within clans, and juvenile females tended to remain in their natal clan. Females lost by one male to several rivals tended to reassemble in the same new one-male units later on.

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Authors and Affiliations

  1. Ethology and Wildlife Research, Institute of Zoology, University of Zurich, Birchstrasse 95, 8050, Zurich, Switzerland

    H. Sigg, A. Stolba, J. -J. Abegglen & V. Dasser

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  1. H. Sigg
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  2. A. Stolba
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  3. J. -J. Abegglen
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  4. V. Dasser
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Sigg, H., Stolba, A., Abegglen, J.J. et al. Life history of hamadryas baboons: Physical development, infant mortality, reproductive parameters and family relationships. Primates 23, 473–487 (1982). https://doi.org/10.1007/BF02373959

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  • DOI: https://doi.org/10.1007/BF02373959

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