2004
DOI: 10.1038/sj.hdy.6800532
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Genetic correlations, tradeoffs and environmental variation

Abstract: Negative genetic correlations among traits are often used as evidence for tradeoffs that can influence evolutionary trajectories in populations. While there may be evidence for negative correlations within a particular environment, genetic correlations can shift when populations encounter different environmental conditions. Here we review the evidence for these shifts by focusing on experiments that have examined genetic correlations in more than one environment. In many studies, there are significant changes … Show more

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Cited by 386 publications
(394 citation statements)
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“…Consequently, the sign and magnitude of among-trait correlations will not differ between the two environments. This finding is in contrast to other studies reporting changes in genetic correlations in different environments (reviewed in Sgrò and Hoffmann, 2004), although only one study manipulated the photoperiod (Giesel, 1986). Giesel (1986) reported changes in the sign of genetic correlations between life history traits in Drosophila melanogaster.…”
Section: Discussioncontrasting
confidence: 99%
“…Consequently, the sign and magnitude of among-trait correlations will not differ between the two environments. This finding is in contrast to other studies reporting changes in genetic correlations in different environments (reviewed in Sgrò and Hoffmann, 2004), although only one study manipulated the photoperiod (Giesel, 1986). Giesel (1986) reported changes in the sign of genetic correlations between life history traits in Drosophila melanogaster.…”
Section: Discussioncontrasting
confidence: 99%
“…If there is a genetically based tradeoff between these traits, then the traits should be negatively correlated among families. In addition, if the tradeoff results from a nutrient allocation tradeoff, then the negative correlation should be stronger in a lower nutrition environment [25,45]. Second, we examined the relationship between chirp rate and duration within and among 12 populations using males reared in a common environment.…”
Section: Introductionmentioning
confidence: 99%
“…The cost of resistance hypothesis provides a potential mechanism for the maintenance of this variation (Sheldon and Verhulst, 1996;Gemmill and Read, 1998;Rigby et al, 2002;Brown, 2003;Sandland and Minchella, 2003). This hypothesis is based on a fundamental assumption underlying life-history theory, that the evolution of fitness traits is constrained by universal trade-offs among them (Reznick et al, 2000;Roff, 2002;Sgrò and Hoffmann, 2004). Similarly, if resistance-conferring genes damage the expression of other fitness traits, the evolution of resistance in a population may be constrained, thus contributing to the maintenance of genetic polymorphism for parasite resistance (Simms and Rausher, 1987;Simms, 1992;Mitchell-Olds and Bradley, 1996;Gemmill and Read, 1998;Brown, 2003).…”
Section: Introductionmentioning
confidence: 99%
“…Most life-history trade-offs are measured under only one set of environmental conditions (see review by Sgrò and Hoffmann, 2004). Yet, when genotype-environment interactions are taken into consideration, context-dependent genetic correlations are often detected among lifehistory traits (Service and Rose, 1985;de Jong, 1990;Stearns et al, 1991).…”
Section: Introductionmentioning
confidence: 99%
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