Abstract
Recent studies have shown a relation between low- and high-frequency environmental variability and aspects of culture. This paper uses low-frequency alluvial and hydrological changes on the Colorado Plateaus and high-frequency changes in moisture availability for the northern Rio Grande between A.D. 1150 and A.D. 1600 to derive expectations for changes in settlement organization on the Pajarito Plateau. The expectations are evaluated using data on the distribution of population and field houses in elevation zones. Changes in population size and aggregation also are reviewed. Low-frequency processes especially appear to have played a role in settlement change until A.D. 1450. After this date, settlement does not conform to expectations. Reasons for this are suggested, including a poor understanding of low- frequency processes, conflict, and human-induced environmental degradation.
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