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Technical note: a novel geometric morphometric approach to the study of long bone shape variation
Mélanie A Frelat1, Stanislav Katina, Gerhard W Weber
1Dipartimento di Storie e Metodi per la Conservazione dei Beni Culturali, University of Bologna, 48121 Ravenna, Italy. melanieagnes.frelat@unibo.it
American Journal of Physical Anthropology
|November 6, 2012
Summary
Geometric morphometrics (GM) now analyzes whole hominoid tibiae, not just skulls. Novel methods improve shape analysis, revealing primate differences and aiding functional studies of locomotion and posture.
Area of Science:
- Paleoanthropology
- Biomechanics
- Comparative Anatomy
Background:
- Geometric morphometrics (GM) typically analyzes craniofacial variation.
- Previous studies on hominoid tibiae shape are limited.
Purpose of the Study:
- To apply geometric morphometrics (GM) to whole hominoid tibiae.
- To introduce novel methodological improvements for tibial shape analysis.
- To explore functional interpretations of tibial shape variation.
Main Methods:
- Utilized Procrustes-based geometric morphometrics (GM).
- Developed new landmark configurations for 77 hominoid tibiae (15 epiphyseal, 483 semilandmarks).
- Implemented an artificial affine transformation for improved shaft moment analysis.
Main Results:
- Principal component analysis of tibial shapes supports known human-primate differences.
- The artificial affine transformation enhanced clustering of great ape specimens.
- Shape variations correlate with potential differences in locomotion and posture.
Conclusions:
- Geometric morphometrics (GM) is effective for analyzing whole postcranial elements like the tibia.
- The novel methods offer improved accuracy and clustering in hominoid tibial shape analysis.
- This approach can be valuable for functional analyses in modern and fossil hominoids.
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