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Canine tooth size variability in primates.

G Beauchamp1

  • 1Sub-Department of Animal Behaviour, University of Cambridge, Madingley, UK.

Folia Primatologica; International Journal of Primatology
|January 1, 1989
PubMed
Summary
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Canine size variability in primates increases with average canine size. Mating systems, particularly polygyny, significantly influence this variability in males, suggesting a link to male-male competition.

Area of Science:

  • Primate evolutionary biology
  • Comparative anatomy
  • Behavioral ecology

Background:

  • Canine tooth size is a key trait in primates, often exhibiting sexual dimorphism.
  • Phenotypic variability, including canine size, can be influenced by ecological and social factors.
  • The relationship between sexual dimorphism and overall trait variability is an area of ongoing research.

Purpose of the Study:

  • To analyze canine tooth size variability in male and female primates.
  • To investigate the influence of diet, habitat, and mating systems on canine size variability.
  • To explore the evolutionary drivers behind canine size variation, particularly in relation to male competition.

Main Methods:

  • Calculation of the coefficient of variation (CV) to index canine size variability.

Related Experiment Videos

  • Regression analysis of log standard deviation (SD) on log mean canine size.
  • Analysis of residuals to assess the contribution of diet, habitat, and mating system to variability.

    • Main Results:

    • Canine size variability is dependent on mean canine size in both sexes, increasing with larger mean sizes.
    • Polygynous mating systems are associated with more variable canine sizes in males compared to monogamous systems.
    • Neither habitat nor diet significantly contributed to the observed canine size variability in either sex.

    Conclusions:

    • The mating system, specifically polygyny, is a significant factor influencing canine size variability in male primates.
    • Increased canine size variability in polygynous species may be linked to the evolution of enlarged canines driven by male-male competition for mates.
    • Further research can explore the direct selective pressures shaping canine dimorphism and variability across primate taxa.