Predator induced life-history shifts in a freshwater cladoceran |
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Authors: | Herwig Stibor |
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Institution: | (1) Max-Planck-Institut für Limnologie, Abteilung Ökophysiologie, Postfach 165, W-2320 Plön, Federal Republic of Germany |
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Abstract: | Summary Life-history theory predicts that maturity and resource allocation patterns are highly sensitive to selective predation. Under reduced adult survival, selection will favour genotypes capable of reproducing earlier, at a smaller size and with a higher reproductive effort. When exposed to water that previously held fish, (size selective predators which prefer larger Daphnia), individuals of Daphnia hyalina reproduced earlier, at a smaller size and had a higher reproductive investment. Hence the prey was able to switch its life history pattern in order to become less susceptible to predation by a specific predator. The cue that evokes the prey response is a chemical released by the predator. |
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Keywords: | Daphnia Predator induction Life-history strategy Resource allocation Phenotypic plasticity |
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