Abstract
Laboratory and field experiments were carried out to test how density of submerged vegetation affected the success of predators foraging on decapod crustaceans in aquatic environments. Only high densities of artificial eelgrass significantly hindered the success of killifish feeding on grass shrimp in the laboratory, compared to that on bare sand; neither intermediate nor low densities of vegetation significantly reduced the effectiveness of killifish prédation. In the field, tethering experiments showed that both brachyuran and anomuran crabs were taken in significantly fewer numbers in turtlegrass and drift algae than on bare sand. In addition, prédation rates were higher in spring than in summer experiments, and varied considerably among prey taxa tested.
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