Abstract
Terman's (1974) model of interspecific competition based on the frequency of interspecific contact (FIC) predicted that the degree of spatial association between cotton rats and prairie voles could be determined from characteristics of the cotton rat population. To test Terman's model, annual changes in cotton rat population structure were examined for correlations with spatial association between voles and cotton rats. Coefficients of association varied systematically with changes in cotton rat population density, numbers of adults, and numbers of reproductive adults. The results tend to support Terman's general model based on FIC. However, the relationships between cotton rat population structure and spatial association were not linear.
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