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(A) Effect of beetle population density (N) on log fitness (number of adult offspring per adult beetle) at a range of adult densities, on wheat, corn, or a mixture. Using results in A as a measure of density-dependent fitness, we calculated the ratio of fitness in mixed wheat:corn habitat to fitness on wheat only. This fitness is plotted against population density (B) to measure the effect of competition on the relative advantage of a mixed diet.
