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Captivity alters primate skeletal morphology, impacting evolutionary and functional studies. Researchers found significant differences in postcranial bone size and shape between free-ranging and captive-born macaques and marmosets, particularly in the scapula.

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Area of Science:

  • Primate morphology
  • Comparative anatomy
  • Evolutionary biology

Background:

  • Skeletal morphology is crucial for evolutionary, genetic, developmental, physiological, and functional research.
  • Captive-born individuals are often included in studies due to sample size, demographic, or conservation constraints.
  • Captivity can induce physical, physiological, or behavioral changes affecting skeletal form.

Purpose of the Study:

  • To assess postcranial skeletal form differences between free-ranging and captive-born primates.
  • To compare these differences in two species: Macaca mulatta (macaques) and Saguinus oedipus (marmosets).

Main Methods:

  • Recorded 24 skeletal dimensions from various bones (scapula, limbs, innominate) in adult free-ranging and captive-born macaques and marmosets.
  • Assessed age of epiphyseal closure in immature captive-born macaques.
  • Utilized analysis of variance and principal component analyses to detect significant differences.

Main Results:

  • Significant differences in postcranial size and shape were observed between free-ranging and captive-born individuals within each species.
  • Free-ranging macaques were larger than captive-born macaques, though this pattern was not consistent in marmosets.
  • Shape differences were notable throughout the skeleton, with the scapula showing particular prominence.

Conclusions:

  • Captivity significantly influences primate postcranial skeletal morphology.
  • Developmental timing, nutrition, and physical activity in captivity contribute to observed skeletal variations.
  • These morphological differences must be considered when incorporating captive-born primates into morphological or evolutionary studies.