The genetic architecture of ecological specialization: correlated gene effects on host use and habitat choice in pea aphids

The American Naturalist
S Via, David J Hawthorne

Abstract

Genetic correlations among phenotypic characters result when two traits are influenced by the same genes or sets of genes. By reducing the degree to which traits in two environments can evolve independently (e.g., Lande 1979; Via and Lande 1985), such correlations are likely to play a central role in both the evolution of ecological specialization and in its link to speciation. For example, negative genetic correlations between fitness traits in different environments (i.e., genetic trade-offs) are thought to influence the evolution of specialization, while positive genetic correlations between performance and characters influencing assortative mating can accelerate the evolution of reproductive isolation between ecologically specialized populations. We first discuss how the genetic architecture of a suite of traits may affect the evolutionary role of genetic correlations among them and review how the mechanisms of correlations can be analyzed using quantitative trait locus (QTL) mapping. We then consider the implications of such data for understanding the evolution of specialization and its link to speciation. We illustrate this approach with a QTL analysis of key characters in two races of pea aphids that are highly specializ...Continue Reading

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Citations

May 25, 2010·Protoplasma·Emily L ClarkStephen F Hubbard
Aug 15, 2006·Journal of Chemical Ecology·Yasmin J CardozaOwain R Edwards
Jun 19, 2001·Trends in Ecology & Evolution·S Via
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