The rules of engagement: how to defend against combinations of predators |
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Authors: | Jason T. Hoverman Rick A. Relyea |
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Affiliation: | (1) Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA;(2) Department of Forestry, Wildlife, and Fisheries, University of Tennessee, 274 Ellington Plant Sciences Building, Knoxville, TN 37996-4563, USA |
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Abstract: | Studies of inducible defenses have traditionally examined prey responses to one predator at a time. However, prey in nature encounter combinations of predators that should force them to produce phenotypic compromises. We examined how snails (Helisoma trivolvis) alter their phenotype in the presence of three different predator species that were presented alone and in pairwise combinations. When snails were exposed to each predator alone, they formed predator-specific defenses that reflected the differences in each predator’s foraging mode. When snails were exposed to pairwise combinations of predators, their phenotype was dependent on their ability to detect each predator, the risk posed by each predator, and the effectiveness of a given defense against each predator. Consequently, responses to combined predators were typically biased towards one of the predators in the pair. This suggests that prey facing combined predators do not form simple intermediate defenses and, as a result, may experience enhanced mortality risk when they encounter natural predator regimes. |
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Keywords: | Combined predators Functional trade-offs Inducible defenses Multiple predators Multiple traits Predator density Predator identity Predation risk Trait integration |
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