PHENOTYPIC PLASTICITY FOR LIFE-HISTORY TRAITS IN DROSOPHILA-MELANOGASTER .2. EPIGENETIC MECHANISMS AND THE SCALING OF VARIANCES

TitlePHENOTYPIC PLASTICITY FOR LIFE-HISTORY TRAITS IN DROSOPHILA-MELANOGASTER .2. EPIGENETIC MECHANISMS AND THE SCALING OF VARIANCES
Publication TypeJournal Article
Year of Publication1993
AuthorsGEBHARDT, MD, and Stearns SC
JournalJournal of Evolutionary BiologyJournal of Evolutionary Biology
Volume6
Pagination17-29
Accession NumberA1993KU84100002
Abstract

We manipulated developmental time and dry weight at eclosion in 15 genotypes of Drosophila melanogaster by growing the larvae in 9 environments defined by 3 yeast concentrations at 3 temperatures. We observed how the genetic and various environmental components of phenotypic variation scaled with the mean values of the traits.Temperature, yeast, within-environmental factors and genotype influenced the genotypic and environmental standard deviations of the two traits in patterns that point to very different modes of physiological and developmental action of these factors. Since different factors affected the environmental and genetic components of the phenotypic variation either in parallel or inversely, we conclude that environmental heterogeneity may have small or large effects on evolutionary rates depending on which factors cause the heterogeneity. The analysis also suggests that the scaling of variances with the mean is not as trivial as is often assumed when coefficients of variation are computed to ”standardize” variation.

Short TitleJ Evolution Biol
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