Inconsistency between different measures of sexual selection.

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Version: Final published version
Serval ID
serval:BIB_1029791C3F46
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Inconsistency between different measures of sexual selection.
Journal
American Naturalist
Author(s)
Fitze P.S., Le Galliard J.F.
ISSN
1537-5323 (Electronic)
ISSN-L
0003-0147
Publication state
Published
Issued date
2011
Peer-reviewed
Oui
Volume
178
Number
2
Pages
256-68
Language
english
Abstract
Measuring the intensity of sexual selection is of fundamental importance to the study of sexual dimorphism, population dynamics, and speciation. Several indices, pools of individuals, and fitness proxies are used in the literature, yet their relative performances are strongly debated. Using 12 independent common lizard populations, we manipulated the adult sex ratio, a potentially important determinant of the intensity of sexual selection at a particular time and place. We investigated differences in the intensity of sexual selection, as estimated using three standard indices of sexual selection-the standardized selection gradient (β'), the opportunity of selection (I), and the Bateman gradient (βss)--calculated for different pools of individuals and different fitness proxies. We show that results based on estimates of I were the opposite of those derived from the other indices, whereas results based on estimates of β' were consistent with predictions derived from knowledge about the species' mating system. In addition, our estimates of the strength and direction of sexual selection depended on both the fitness proxy used and the pool of individuals included in the analysis. These observations demonstrate inconsistencies in distinct measures of sexual selection and underscore the need for caution when comparing studies and species.
Keywords
Standardized selection gradients, opportunity for sexual selection, Bateman gradient, natural selection, adult sex ratio, common lizard
Pubmed
Web of science
Open Access
Yes
Create date
19/03/2011 0:30
Last modification date
20/08/2019 12:36
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