THE MEASUREMENT OF SELECTION ON QUANTITATIVE TRAITS - BIASES DUE TO ENVIRONMENTAL COVARIANCES BETWEEN TRAITS AND FITNESS
THE MEASUREMENT OF SELECTION ON QUANTITATIVE TRAITS - BIASES DUE TO ENVIRONMENTAL COVARIANCES BETWEEN TRAITS AND FITNESS
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DOI：
10.1111/j.1558-5646.1992.tb02070.x
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发表时间：
1992-06-01
期刊：
影响因子：
3.3
通讯作者：
RAUSHER, MD
中科院分区：
文献类型：
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作者：
RAUSHER, MD
回归技术的使用，估计选择的方向和幅度从测量表型已成为广泛的领域研究。这些技术的一个潜在问题是，环境之间的相关性的健身和性状检查可能会产生有偏的估计选择梯度。本报告表明，表型之间的协方差健身和性状，作为估计选择梯度的选择差异的估计，有两个组成部分：一个组件诱导的选择本身和组件由于环境因素对健身的影响。第二个分量被证明是导致选择梯度估计偏差的原因。使用涉及基因型和育种值而不是表型值的回归可以产生不受环境协方差影响的选择梯度的估计。统计方法，估计这种回归系数，并在回归涉及表型值的偏差进行测试，描述。
The use of regression techniques for estimating the direction and magnitude of selection from measurements on phenotypes has become widespread in field studies. A potential problem with these techniques is that environmental correlations between fitness and the traits examined may produce biased estimates of selection gradients. This report demonstrates that 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 shown to be responsible for biases in estimates of selection gradients. The use of regressions involving genotypic and breeding values instead of phenotypic 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.