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The three-dimensional morphological effects of captivity.

Adam Hartstone-Rose1, Hannah Selvey2, Joseph R Villari3

  • 1Department of Cell Biology and Anatomy, University of South Carolina School of Medicine, Columbia, South Carolina, United States of America; Department of Anthropology, University of South Carolina, Columbia, South Carolina, United States of America.

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Summary
This summary is machine-generated.

Captive big cats fed soft diets show significant skull shape differences compared to wild counterparts. Captivity status, not sex, is the primary driver of these osteological changes.

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Area of Science:

  • Comparative anatomy
  • Osteology
  • Animal husbandry

Background:

  • Captive pantherines often receive diets lacking mechanical resistance.
  • Reduced masticatory effort in captivity may impact skeletal development.
  • Osteological effects of captive diets are not fully understood.

Purpose of the Study:

  • To compare skull morphology in captive versus wild lions and tigers.
  • To investigate the influence of diet and captivity on felid skull shape.
  • To assess the impact of reduced mastication on osteology.

Main Methods:

  • Linear measurements of skulls from captive and wild felids.
  • 3D geometric morphometric landmark analysis.
  • Principal Component (PC) analysis to assess variation.

Main Results:

  • Skull shape differed significantly between captive and wild populations.
  • Captivity status was a stronger driver of skull shape variation than sexual dimorphism.
  • PC2, reflecting skull shape, was primarily influenced by captivity, not sex.

Conclusions:

  • Captivity significantly alters skull morphology in lions and tigers.
  • Dietary mechanical properties may be a key factor in observed osteological differences.
  • Findings have implications for zoo animal husbandry and anatomical research.