Pelvic sexual dimorphism and relative neonatal brain size really are related

Authors

  • Mark Ridley

    Corresponding author
    1. Departments of Anthropology and Biology, Emory University, Atlanta, Georgia 30322
    • Departments of Anthropology and Biology, Emory University, Atlanta, GA 30322
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Abstract

Primate species in which the neonatal brain size is large relative to the birth canal tend to have more sexually dimorphic pelves: this is a classic comparative relation, discovered by Schultz and Leutenegger. The original work did not correct for phylogenetic nonindependence of the data points; it only partly corrected for body size; it used ratios in both variables, and the size of the female pubis featured in both x- and y-variables. A recent publication by Tague placed a question mark over the validity of the relation. I therefore retested it, correcting for all four statistical defects. A strongly significant statistical relation exists. © 1995 Wiley-Liss, Inc.

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