This paper was awarded the Earnest Albert Hooton Prize for Best Poster at the 2004 Annual Meeting of the American Association for Physical Anthropologists (Tampa, FL).
Bilateral asymmetry in the limb bones of the chimpanzee (Pan troglodytes)†
Version of Record online: 18 AUG 2005
Copyright © 2005 Wiley-Liss, Inc.
American Journal of Physical Anthropology
Volume 128, Issue 4, pages 840–845, December 2005
How to Cite
Sarringhaus, L.A., Stock, J.T., Marchant, L.F. and McGrew, W.C. (2005), Bilateral asymmetry in the limb bones of the chimpanzee (Pan troglodytes). Am. J. Phys. Anthropol., 128: 840–845. doi: 10.1002/ajpa.20190
- Issue online: 23 NOV 2005
- Version of Record online: 18 AUG 2005
- Manuscript Accepted: 30 JUL 2004
- Manuscript Received: 14 JAN 2004
- Undergraduate Summer Scholarship, Miami University
- Kirtlandia Society's Adopt-A-Student Program, Cleveland Museum of Natural History
- second metacarpal;
There is much debate in behavioral primatology on the existence of population-level handedness in chimpanzees. The presence or absence of functional laterality in great apes may shed light on the origins of human handedness and on the evolution of cerebral asymmetry. The plasticity of long bone diaphyses in response to mechanical loading allows the functional interpretation of differences in cross-sectional geometric. While left-right asymmetry in upper limb diaphyseal morphology is a known property in human populations, it remains relatively unexplored in apes. We studied bilateral asymmetry in 64 skeletons of wild-caught chimpanzee using the humerus, second metacarpal, and femur. The total subperiosteal area (TA) of the diaphyses was measured at 40% of maximum humeral length and at the midshaft of the metacarpals and femora using external silicone molds. Overall, the TA values of the left humeri were significantly greater than the right, indicating directional asymmetry. This effect was even greater when the magnitude of difference in TA between each pair of humeri was compared. The right second metacarpals showed a tendency toward greater area than did the left, but this did not reach statistical significance. The lack of asymmetry in the femur serves as a lower limb control, and suggests that the upper limb results are not a product of fluctuating asymmetry. These findings imply behavioral laterality in upper limb function in chimpanzees, and suggest a complementary relationship between precision and power. Am J Phys Anthropol 2005., © 2005 Wiley-Liss, Inc.