Plains-Pueblo Interdependence and Human Diet at Pecos Pueblo, New Mexico

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Abstract
Using bone-chemistry data, this project sought to assess the degree of dietary change that occurred among eastern border Pueblo populations due to prehistoric food exchange with hunter-gatherers on the Plains and to the arrival of Spanish colonists. In so doing we introduce a technique for dietary reconstruction that determines the range of diets compatible with bone-chemistry data from a particular population. The data are derived from samples of modern and archaeological plants and animals collected from the area surrounding Pecos Pueblo, and from archaeological humans recovered from Pecos itself. Bone-strontium concentrations were measured to monitor the relative proportions of meat to vegetables in the diet. Carbon and nitrogen stable-isotope ratios in food items and in bone collagen were measured to monitor the dependence on maize and bison meat. The results do not provide support for the hypothesis that bison replaced mule deer in the diet during the period of significant Plains-Pueblo trade. If bison, whose diets are relatively enriched in 13C had replaced mule deer, an increase in average δ13C values should have occurred. This, however, was not observed. A decrease in carbon-isotope values in the historic period suggests that either bison meat or maize or both decreased in importance in the Pecos diet and that dependence on wild plants increased.