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Primate Resting Postures: Constraints by Foregut Fermentation?

Ikki Matsuda, Colin A Chapman, Chua Ying Shi Physilia

    Physiological and Biochemical Zoology : PBZ
    |April 7, 2017
    PubMed
    Summary
    This summary is machine-generated.

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    Colobine primates, or leaf-eating monkeys, predominantly rest in a sitting position. This unique posture is likely due to their digestive anatomy and the need to release gas.

    Area of Science:

    • Primate Behavior
    • Comparative Anatomy
    • Digestive Physiology

    Background:

    • Resting behavior is a significant activity in primates, particularly foregut-fermenting colobines.
    • Limited research exists on the specific resting postures adopted by colobines.
    • Colobines possess a specialized foregut digestive system distinct from hindgut-fermenting primates.

    Purpose of the Study:

    • To investigate and compare the resting postures of colobine primates with other primate groups.
    • To test the hypothesis that colobines are more restricted in their resting positions than hindgut-fermenting primates.
    • To explore the potential reasons behind the prevalent sitting posture in colobines.

    Main Methods:

    • Observational study of resting positions in captive colobines (2 individuals x 8 species).
    Keywords:
    colobineforegut fermenterhindgut fermenterpositional behaviorsittingsloths

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  • Analysis of literature data on resting postures of free-ranging primates (31 species).
  • Statistical comparison of sitting posture prevalence between colobines and other primates in both captive and wild settings.

    • Main Results:

    • Both captive and wild observations revealed a significantly higher proportion of time spent in a sitting posture by colobines compared to other primates.
    • Captive colobines sat 73.0% of the time versus 23.2% for other primates.
    • Wild colobines sat 83.0% of the time versus 60.9% for other primates.

    Conclusions:

    • Colobine primates exhibit a strong preference for a sitting resting posture.
    • This posture is hypothesized to be an adaptation to their foregut fermentation, accommodating the digestive chamber and facilitating the eructation of gases.
    • Sitting posture may prevent thoracic pressure and aid respiratory function in colobines.