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On the Measurement of Natural and Sexual Selection: Theory

Stevan J. Arnold and Michael J. Wade
Evolution
Vol. 38, No. 4 (Jul., 1984), pp. 709-719
DOI: 10.2307/2408383
Stable URL: http://www.jstor.org/stable/2408383
Page Count: 11
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On the Measurement of Natural and Sexual Selection: Theory
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Abstract

The primary contributions of this paper are, first, an elucidation of the relationship between various measures of selection and their relationships to predictive equations for evolutionary change. We show that the opportunity for selection (variance in relative fitness) places an upper bound on the amount that the mean of any character can be shifted by directional selection. Second, we offer several solutions to the problem of analyzing multiple selection episodes (e.g., sexual versus natural selection). We show how the total effect of directional selection can be partitioned into parts corresponding to particular selection episodes or fitness components. The opportunity for selection cannot be so readily partitioned because of covariances between fitness components. We present a rather complex partitioning which may nevertheless be useful in particular applications.

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