Resource Specialization, Population Growth, and Agricultural Production in the American Southwest

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Abstract
The prehistoric period of the northern American Southwest is characterized by increased population, increased agricultural production, and regional depopulation. Most current models of evolutionary change that attempt to explain these phenomena are defined at the scale of "culture" or of a specific adaptation, e.g., "Anasazi adaptive system." I suggest that for most purposes these are not productive constructs, and that their application makes useful explanations difficult, if not impossible to formulate. As a further liability, these models ignore the role of natural selection as an explanatory mechanism, preferring instead to seek explanation through the premature application of the concept of adaptation. The application of a selectionist perspective, as opposed to the more popular adaptationist model, leads to the conclusion that the operation of natural selection favoring productive specialization accounts for the characteristics noted above for the prehistoric American Southwest.