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Identifying the morphological signatures of hybridization in primate and human evolution

Summary: Identifying the morphological signatures of hybridization
in primate and human evolution
Rebecca Rogers Ackermann a,*, Jeffrey Rogers b
, James M. Cheverud c
Department of Archaeology, University of Cape Town, Private Bag, Rondebosch 7701, South Africa
Department of Genetics, Southwest Foundation for Biomedical Research, and the Southwest National Primate Research Center,
San Antonio, Texas 78245, USA
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis 63130, USA
Received 2 February 2006; accepted 18 July 2006
Recent studies point to contact and possible admixture among contemporaneous hominin species during the Plio-Pleistocene. However,
detection of hybridization in fossilsdand especially fossil homininsdis contentious, and it is hindered in large part by our lack of understanding
about how morphological hybridity is manifested in the primate skeleton. Here, we report on a study of known-pedigree, purebred yellow and
olive baboons (n 112) and their hybrids (n 57), derived from the baboon colony of the Southwest Foundation for Biomedical Research. The
hybrids were analyzed in two different groups: (1) F1 olive yellow first-generation hybrids; (2) B1 olive F1 backcross hybrids. Thirty-
nine metric variables were tested for heterosis and dysgenesis. Nonmetric data were also collected from the crania. Results show that these pri-
mate hybrids are somewhat heterotic relative to their parental populations, are highly variable, and display novel phenotypes. These effects are


Source: Ackermann, Rebecca Rogers - Department of Archaeology, University of Cape Town


Collections: Biology and Medicine