Reconsidering the null hypothesis: Is maternal rank associated with birth sex ratios in primate groups?

  title={Reconsidering the null hypothesis: Is maternal rank associated with birth sex ratios in primate groups?},
  author={Gillian R. Brown and Joan B. Silk},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={99 17},
Trivers and Willard hypothesized that vertebrates adaptively vary the sex ratio of their offspring in response to the mother's physical condition [Trivers, R. L. & Willard, D. (1973) Science 179, 90-92]. This hypothesis has produced considerable debate within evolutionary biology. Here we use meta-analysis techniques to evaluate claims that nonhuman primate females facultatively adjust the sex ratio of their progeny in relation to their own dominance rank in a uniform way. The magnitude of the… CONTINUE READING
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