The evolution of trade-offs: testing predictions on response to selection and environmental variation

Evolution; International Journal of Organic Evolution
D A RoffD J Fairbairn

Abstract

The concept of phenotypic trade-offs is a central element in evolutionary theory. In general, phenotypic models assume a fixed trade-off function, whereas quantitative genetic theory predicts that the trade-off function will change as a result of selection. For a linear trade-off function selection will readily change the intercept but will have to be relatively stronger to change the slope. We test these predictions by examining the trade-off between fecundity and flight capability, as measured by dorso-longitudinal muscle mass, in four different populations of the sand cricket, Gryllus firmus. Three populations were recently derived from the wild, and the fourth had been in the laboratory for 19 years. We hypothesized that the laboratory population had most likely undergone more and different selection from the three wild populations and therefore should differ from these in respect to both slope and intercept. Because of geographic variation in selection, we predicted a general difference in intercept among the four populations. We further tested the hypothesis that this intercept will be correlated with proportion macropterous and that this relationship will itself vary with environmental conditions experienced during both ...Continue Reading

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Citations

Jul 29, 2011·Oecologia·H H WhitemanJ J Gutrich
Oct 18, 2007·Proceedings of the National Academy of Sciences of the United States of America·Johannes M H KnopsWilliam J Carmen
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