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Journal Article

Measuring Preference in Selective Predation

Jean Chesson
Ecology
Vol. 59, No. 2 (Mar., 1978), pp. 211-215
Published by: Wiley on behalf of the Ecological Society of America
DOI: 10.2307/1936364
Stable URL: http://www.jstor.org/stable/1936364
Page Count: 5
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Measuring Preference in Selective Predation
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Abstract

Selective predation occurs when the relative frequencies of prey types in a predator's diet differ from the relative frequencies in the environment. A measure of preference is proposed which is derived from a simple stochastic model involving probability of encounter and probability of capture upon encounter. The measure is applicable to any number of prey types and methods of estimation are given for both constant and changing prey numbers. Because the measure is based on a biological model, it can be manipulated and interpreted in a meaningful way.

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