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The r - K Continuum and the Relative Effectiveness of Sexual Selection

Denson Kelly McLain
Oikos
Vol. 60, No. 2 (Mar., 1991), pp. 263-265
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3544875
Stable URL: http://www.jstor.org/stable/3544875
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The r - K Continuum and the Relative Effectiveness of Sexual Selection
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Abstract

It is well established that genetic correlations between multiplicative fitness components determine the response to countervailing selection pressures such that for many traits a balance is struck between the opposing forces of natural and sexual selection. The proportion of variance in lifetime reproductive success contributed by variation in sexually selected traits is inversely proportional to the rate of juvenile mortality. Thus, extreme expression of sexually selected traits, is more likely in K- than in r-selected species. Sexual dimorphism in size is consistent with this prediction; males are larger in K-selected species, representing response to sexual selection, while females are larger in r-selected species, representing response to natural selection for fecundity enhancement.

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