Dictionary of Human Evolution and Biology

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Birdsell, Joseph B. (1908-94)

US anthropologist and genetic ecologist; spent several field seasons in Australia with Australian biologist and anthropologist Norman B. Tindale (1900-93). Birdsell coined the term gene flow to account for the clinal distribution of traits such as tawny hair in the western desert. Known for his estimation of the number of major migrations that peopled continents by examination of the spatial clustering of phenotypes; this resulted in the trihybrid hypothesis of the peopling of both Australia and the Americas. Author of Microevolutionary Patterns in Aboriginal Australia (1993).

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