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Related Experiment Videos

Dispersion dimorphism in human populations.

Elisabetta Marini1, Esther Rebato, Walter Racugno

  • 1Sezione di Scienze Antropologiche, Dipartimento Biologia Sperimentale, Università di Cagliari, 09042 Monserrato (Cagliari), Italy.

American Journal of Physical Anthropology
|December 8, 2004
PubMed
Summary

This study confirms dispersion dimorphism in human anthropometric traits, finding greater variability in men for subcutaneous skinfolds. This sex difference in phenotype variability may relate to reproductive functions and sociocultural influences.

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Area of Science:

  • Anthropology
  • Human Biology
  • Biometrics

Background:

  • Sex differences in human anthropometric traits are well-documented.
  • Dispersion dimorphism, or differences in trait variability between sexes, is less understood.
  • This study investigates anthropometric variability differences between males and females.

Purpose of the Study:

  • To verify the existence of dispersion dimorphism in skeletal, muscular, and adipose dimensions.
  • To evaluate this understudied aspect of human sex differences.
  • To analyze anthropometric data from Sardinian and Basque populations.

Main Methods:

  • Collected 23 anthropometric measurements from two European samples.
  • Performed qualitative analysis of coefficients of variation between sexes.

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  • Employed Student's t-test and bootstrap tests to verify variability equality.

    • Main Results:

    • Observed parallel trends in anthropometric measurements across both populations.
    • Subcutaneous skinfolds exhibited significant dispersion dimorphism, with higher variation in males.
    • Greater canalization in female dimensions, potentially linked to reproductive function, was suggested.

    Conclusions:

    • Dispersion dimorphism in anthropometric traits is confirmed.
    • This phenomenon may be influenced by biological canalization and sociocultural factors.
    • Dispersion dimorphism offers a pattern for describing sex-specific phenotype variability.