Foraging on prey that are modified by parasites
Article Abstract:
A model was developed to demonstrate the effect of parasites on predator-prey interactions. The model weighs the energetic cost of parasitism on a predator against the energetic value of a prey that transmits a parasite to the predator. The results showed that there is no selection pressure to avoid predation on parasitized prey, which could explain why many parasites exploit predator-prey interactions to complete their life cycles. Parasitism could benefit predators when its energetic costs are moderate and when it facilitates prey capture, although the relationship between predator and parasite in these cases should not be considered as mutualism.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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Prey uncertainty and the balancing of antipredator and feeding needs
Article Abstract:
A model was developed to study the hypothesis that the behavioral time lag between presentation of predators and emergence of prey from its refuge is due to prey uncertainty about the presence of predators balanced by the need for food. The model was tested by observing the behavior of juvenile aquatic bugs (Notonecta hoffmani) with respect to the addition and removal of cannibalistic adults of the same species. The experimental results showed that time lags were longer with greater predation risk and when the prey was well-fed, thereby corroborating some predictions of the model.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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Thinning and clearing of prey by predators
Article Abstract:
The influence of predator behavior on the density of prey population is discussed. The thinning and clearing pattern of prey density depends on predators' foraging patterns and the number of unoccupied sites. The hunting behavior of an avian predator, Limnodromus griseus, matched the change in spatial behavior of the polychaete prey, Clymenella torquata.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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