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Evolution and Selection of Quantitative Traits$
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Bruce Walsh and Michael Lynch

Print publication date: 2018

Print ISBN-13: 9780198830870

Published to Oxford Scholarship Online: September 2018

DOI: 10.1093/oso/9780198830870.001.0001

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Selection Response in Natural Populations

Selection Response in Natural Populations

(p.671) 20 Selection Response in Natural Populations
Evolution and Selection of Quantitative Traits

Bruce Walsh

Michael Lynch

Oxford University Press

The breeder's equation often fails when applied to natural populations. In large part, this likely occurs because the assumed trait is not the actual target of selection. A within-generation change in the mean of a suggested target trait can arise as a correlated response from selection acting elsewhere. This chapter examines sources of error in the breeder's equation and approaches that attempt to determine if an assumed trait is actually the true target of selection. It also reviews a number of long-term studies from natural populations and examines possible sources for the failure of most of these studies to conform to the expectations of the breeder's equation.

Keywords:   bivariate animal model, breeder's equation, countergradient variation, cryptic evolution, Fisher-Price-Kirkpatrick-Arnold model, generalized mixed models, missing data models, Morrissey consistency condition, Postma's test, Queller's separation condition, Rausher's consistency condition, Rausher-Simms equality test, Red Queen hypothesis, Robertson consistency tests, variance in relatedness

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