The Leverhulme Trust provided funding (research grant to the University of East Anglia).
Sex-specific effects of developmental environment on reproductive trait expression in Drosophila melanogaster
Article first published online: 8 JUN 2012
© 2011 The Authors. MicrobiologyOpen published by Blackwell Publishing Ltd.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Ecology and Evolution
Volume 2, Issue 7, pages 1362–1370, July 2012
How to Cite
Edward, D. A. and Chapman, T. (2012), Sex-specific effects of developmental environment on reproductive trait expression in Drosophila melanogaster. Ecology and Evolution, 2: 1362–1370. doi: 10.1002/ece3.243
- Issue published online: 6 JUL 2012
- Article first published online: 8 JUN 2012
- Received: 14 February 2012; Revised: 24 February 2012; Accepted: 24 February 2012
- Drosophila melanogaster;
- environmental variation;
- genotype-by-environment interaction;
- larval density;
- larval development;
- sexual selection
Variation in the expression of reproductive traits provides the raw material upon which sexual selection can act. It is therefore important to understand how key factors such as environmental variation influence the expression of reproductive traits, as these will have a fundamental effect on the evolution of mating systems. It is also important to consider the effects of environmental variation upon reproductive traits in both sexes and to make comparisons with the environment to which the organism is adapted. In this study, we addressed these issues in a systematic study of the effect of a key environmental factor, variation in larval density, on reproductive trait expression in male and female Drosophila melanogaster. To do this, we compared reproductive trait expression when flies were reared under controlled conditions at eight different larval densities that covered a 20-fold range. Then, to place these results in a relevant context, we compared the results to those from flies sourced directly from stock cages. Many reproductive traits were surprisingly insensitive to variation in larval density. A notable exception was nonlinear variation in female fecundity. In contrast, we found much bigger differences in comparisons with flies from stock cages—including differences in body size, latency to mate, copulation duration, fecundity, and male share of paternity in a competitive environment. For a number of traits, even densities of 1000 larvae per vial (125 larvae per mL of food) did not phenocopy stock cage individuals. This study reveals novel patterns of sex-specific sensitivity to environmental variation that will influence the strength of sexual selection. It also illustrates the importance of comparisons with the environment to which individuals are adapted.