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Adaptive significance of sex ratio adjustment in semifree-ranging Barbary macaques (Macaca sylvanus) at Salem

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Summary

New data on the secondary sex ratio in semi-free-ranging Barbary macaques at Salem confirm the observation that the offspring of high-ranking females in this colony are biased towards sons while the offspring of low-ranking females are biased towards daughters. Analysis of interbirth intervals yielded no consistent differences in the relative costs of rearing male and female offspring for either high- or low-ranking females. Survivorship to adulthood of male and female offspring born to mothers of all rank classes was remarkably high, and there was no indication that juvenile females of low-ranking mothers face any greater risk. Daughters of high- and low-ranking mothers showed no substantial differences in reproductive success, while mating and probably reproductive success of sons seemed to be dependent on maternal rank, at least at the beginning of their reproductive career. The results suggest that variation in sex ratio does increase parental fitness.

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  1. Institut für Anthropologie, Universität Göttingen, Bürgerstrasse 50, D-3400, Göttingen, Federal Republic of Germany

    Andreas Paul & Jutta Kuester

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  1. Andreas Paul
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  2. Jutta Kuester
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Paul, A., Kuester, J. Adaptive significance of sex ratio adjustment in semifree-ranging Barbary macaques (Macaca sylvanus) at Salem. Behav Ecol Sociobiol 27, 287–293 (1990). https://doi.org/10.1007/BF00164902

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