Abstract
Males and females of two species of copepods were subjected to predation by three different predators in a laboratory environment. Ambystoma tigrinum tadpoles ate more female than male Diaptomus shoshone, Lebistes reticulatus ate more male than female Diaptomus oregonensis, and Hydra cauliculata ate equal numbers of male and female D. oregonensis in a given length of time. Predation alters the adult sex ratios of these prey in the laboratory in a manner influenced by differences in predator hunting behavior and by differences in size and activity of male and female prey. Predictions concerning adult prey sex ratios in natural conditions are discussed.
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