Ontology type: schema:ScholarlyArticle
1981-06
AUTHORS ABSTRACTWe examine the idea that predators may sometimes use a rule of thumb (in this case prey size) to estimate relative prey profitability for optimizing diet selection. We provided adult common shrews with a choice between large and small pieces of mealworm, where large pieces were less profitable than small, because of handling time characteristics.The tendency for animals to prefer large prey depended on their encounter rate with large prey, but was not influenced by variation in encounter rate with small prey once a threshold encounter rate with large (about 0.03 encounters/s) had been reached.We also tested the hypothesis that a predator would be less selective when competing with other animals for food. Shrews showed a significant reduction in selectivity when an apparent ‘competitor’ was present during a test. We examine the idea that predators may sometimes use a rule of thumb (in this case prey size) to estimate relative prey profitability for optimizing diet selection. We provided adult common shrews with a choice between large and small pieces of mealworm, where large pieces were less profitable than small, because of handling time characteristics. The tendency for animals to prefer large prey depended on their encounter rate with large prey, but was not influenced by variation in encounter rate with small prey once a threshold encounter rate with large (about 0.03 encounters/s) had been reached. We also tested the hypothesis that a predator would be less selective when competing with other animals for food. Shrews showed a significant reduction in selectivity when an apparent ‘competitor’ was present during a test. More... »
PAGES239-243
http://scigraph.springernature.com/pub.10.1007/bf00299836
DOIhttp://dx.doi.org/10.1007/bf00299836
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