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Maximum ingested food size in captive anthropoids.

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Maximum ingested food size (Vb) in anthropoid primates scales with negative allometry, unlike strepsirrhines. This suggests adaptations for chewing mechanics may limit bite size in anthropoids, influencing dietary patterns.

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Area of Science:

  • Primate Paleontology
  • Comparative Anatomy
  • Functional Morphology

Background:

  • Maximum ingested food size (Vb) is a key metric for understanding primate feeding energetics and masticatory system adaptations.
  • Previous research on Vb has been limited to strepsirrhine primates.
  • This study expands Vb analysis to a diverse sample of anthropoid primates.

Purpose of the Study:

  • To present the first comprehensive data on Vb in anthropoid primates.
  • To describe the scaling patterns of Vb with body mass in anthropoids.
  • To compare Vb scaling in anthropoids with that of strepsirrhines.

Main Methods:

  • Vb data were collected from anthropoids under captive conditions.
  • Data were compared with published Vb data from strepsirrhines.
  • Vb was scaled against individual body mass and correlated with food material properties (toughness, stiffness).

Main Results:

  • Anthropoid Vb exhibits negative allometric scaling with body mass, contrasting with the isometric scaling observed in strepsirrhines.
  • Food material properties significantly affect Vb, but anthropoid bite size variation is less influenced by food properties compared to strepsirrhines.
  • Large folivorous strepsirrhines align with the anthropoid scaling trend, while large frugivorous strepsirrhines take exceptionally large bites.

Conclusions:

  • Negative allometry in anthropoid Vb may result from adaptations favoring mechanical advantage and muscle fatigue resistance, potentially reducing gape.
  • These adaptations might have led anthropoids to consume smaller, more resistant food items.
  • Similar patterns in Vb scaling and potential gape limitations are observed in some large folivorous strepsirrhines.