Abstract
Abstract Characteristics of ground beetles (Coleoptera: Carabidae), including their distribution, diet breadth, and importance as generalist predators, make them candidates for evaluating potential unintended effects of transgenic crops. The abundance and composition of carabids collected from pitfall traps placed in hybrid dent corn were used to determine which species are consistently present and abundant in Iowa carabid communities and to test for population differences in these species caused by transgenic (Bacillus thuringiensis [Bt]) or insecticide-based pest management. Power analyses were also used to evaluate the adequacy of the experimental design. Carabid collections indicate Harpalus pensylvanicus DeGeer is the best choice to sample based on its apparent ubiquity and abundance in Iowa and other corn-producing states. However, population levels were time-dependent, and composition of carabid communities differed between locations. Considering the numerical dominance of a few species per field, ...
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