The measurement of selection on quantitative traits: biases due to environmental covariances between traits and fitness
Evaluates the use of reegression techniques for estimating the direction and magnitude of selection from measurements on phenotypes. Environmental correlations between fitness and the traits examined may produce biased estimates of selection gradients. The phenotypic covariance between fitness and a trait, used as an estimate of the selection differential in estimating selection gradients, has two components: a component induced by selection itself and a component due to the effect of environmental factors on fitness. The second component is responsible for biases in estimates of selection gradients. Use of regressions involving genotypic and breeding values instead of phenotypc values can yield estimates of selection gradients that are not biased by environmental covariances. Statistical methods for estimating the coefficients of such regressions, and for testing for biases in regressions involving phenotypic values, are described. -from Author
Duke Scholars
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Related Subject Headings
- Evolutionary Biology
- 3104 Evolutionary biology
- 3103 Ecology
- 0603 Evolutionary Biology
- 0602 Ecology
Citation
Published In
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Evolutionary Biology
- 3104 Evolutionary biology
- 3103 Ecology
- 0603 Evolutionary Biology
- 0602 Ecology