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Mandibular variation among Chinese macaques.

Ruliang Pan1, Charles Oxnard, Nick Milne

  • 1Department of Anatomy and Human Biology, University of Western Australia, Crawley, Perth, Western Australia 6009, Australia. pruliang@anhb.uwa.edu.au

American Journal of Primatology
|January 17, 2002
PubMed
Summary

Mandibular variation in Chinese macaques is primarily linked to size, not diet. Recent Asian radiation means phylogenetic history, not functional adaptation, shapes their mandibles.

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Area of Science:

  • Primatology
  • Comparative Anatomy
  • Evolutionary Biology

Background:

  • Understanding primate mandibular variation is key to evolutionary studies.
  • Chinese macaques exhibit diverse diets and habitats, prompting investigation into adaptation.
  • Phylogenetic inertia may play a significant role in shaping primate morphology.

Purpose of the Study:

  • To investigate the drivers of mandibular variation in Chinese macaques.
  • To differentiate between functional adaptation and phylogenetic inertia in mandibular morphology.
  • To assess the taxonomic implications of mandibular similarities among certain macaque species.

Main Methods:

  • Analysis of 13 mandibular variables using bivariate and multivariate statistical techniques.
  • Comparative analysis across different Chinese macaque species.

Related Experiment Videos

  • Evaluation of the relationship between mandibular traits, diet, and phylogenetic history.

    • Main Results:

    • Mandibular differences are predominantly associated with overall size.
    • Despite significant dietary variations, functional adaptation shows a weak link to interspecific mandibular differences.
    • Mandibular structure appears more influenced by recent phylogenetic history than by functional demands.

    Conclusions:

    • Phylogenetic inertia is a stronger determinant of mandibular variation in Chinese macaques than functional adaptation.
    • The findings support the classification of certain stump-tailed and Assam macaques within the 'sinica' species-group.
    • Recent evolutionary radiation in Asia may limit the expression of adaptive mandibular divergence.