Evolutionary Biology

, Volume 39, Issue 1, pp 126–139 | Cite as

Evolvability of the Primate Pelvic Girdle

Research Article

Abstract

The ilium and ischiopubic bones of the pelvis arise from different regulatory pathways, and as a result, they may be modular in their organization such that features on one bone may be morphologically integrated with each other, but not with features on the other pelvic bone. Modularity at this gross level of organization can act to increase the ability of these structures to respond to selection pressures (i.e., their evolvability). Furthermore, recent work has suggested that the evolution of the human pelvis was facilitated by low levels of integration and high levels of evolvability relative to other African apes. However, the extent of morphological integration and modularity of the bones of the pelvic girdle is not well understood, especially across the entire order of primates. Therefore, the hypothesis that the ilium and ischiopubis constitute separate modules was tested using three-dimensional landmark data that were collected from 752 pelves from 35 primate species. In addition, the hypothesis that the human pelvis demonstrates greatest evolvability was tested by comparing it to all other primates. The results demonstrate that regardless of phylogeny and locomotor function, the primate pelvis as a whole is characterized by low levels of overall integration and high levels of evolvability. In addition, the results support the developmental hypothesis of separate ilium and ischiopubis modular units. Finally, all primates, including humans, apparently share a common pattern of integration, modularity, and evolvability in the pelvis.

Keywords

Integration Modularity Adaptation Bipedality Hominin Pelvis 

Notes

Acknowledgments

Thank you to the following osteological collections managers and staff for access to specimens in their care: D. Lunde and E. Westwig (American Museum of Natural History, NY), L. Gordon (National Museum of Natural History, Washington, D.C.), Y. Haile-Selassie and L. Jellema (Cleveland Museum of Natural History), J. Chupasko (Museum of Comparative Zoology, Harvard), W. Stanley (Field Museum of Natural History, Chicago), P. Jenkins and L. Tomsett (Natural History Museum, London), C. Lefèvre, J. Lesur-Gebremariam, J. Cuisin, and J. Villemain (Muséum national d’Histoire naturelle, Paris), and J. Youssouf and A. Randrianandrasana (Beza Mahafaly Osteological Collection, Madagascar). I thank Jeremiah Scott and Brian Villmoare for methodological discussions, Stephanie Meredith for providing the photographs in Fig. 1, and Natalie Cooper for assistance with R. Guilherme Garcia, Campbell Rolian, and Brian Villmoare kindly provided programs for tests on covariance matrices. Comments by Dan Lieberman, Brian Villmoare, and two anonymous reviewers significantly improved this manuscript. This study was supported by grants from NSF (DDIG, BCS-0752575), The Leakey Foundation, Sigma Xi, and Graduate and Professional Students Association and the School of Human Evolution and Social Change at Arizona State University.

Supplementary material

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© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Human Evolutionary BiologyHarvard UniversityCambridgeUSA

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