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Variation in human nasal height and breadth.

R G Franciscus1, J C Long

  • 1Department of Anthropology, University of New Mexico, Albuquerque 87131.

American Journal of Physical Anthropology
|August 1, 1991
PubMed
Summary
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Human nasal index variation is not spurious. New analysis shows nasal breadth variation is greater within populations, supporting its role in adaptation and human evolution.

Area of Science:

  • Anthropology
  • Human Evolution
  • Bioarchaeology

Background:

  • The human nasal index (nasal breadth/nasal height) is linked to climate, but this association is debated.
  • Previous arguments against natural selection on nasal index variation focused on nasal breadth's low variability.

Purpose of the Study:

  • To re-evaluate the variability of human nasal breadth and height.
  • To test the hypothesis that nasal breadth contributes little to human nasal index variation.

Main Methods:

  • Analysis of skeletal nasal breadth and height from 2,408 individuals across 26 diverse populations.
  • Utilized 2x2 variance-covariance matrices of logarithmically transformed data.
  • Applied hypothesis tests for matrix homogeneity and equal variance/covariance.

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Main Results:

  • Intrinsic variation in nasal breadth is greater than nasal height within populations.
  • Nasal breadth and nasal height show equivalent intrinsic variation among populations.
  • The argument that nasal breadth has minimal impact on global nasal index variation is rejected.

Conclusions:

  • Findings support, but do not confirm, an adaptive role for human nasal index variation.
  • Suggests further research into natural selection on human nasal form is warranted.