May 15, 2008

Reproductive behaviour evolves rapidly when intralocus sexual conflict is removed

PloS One
Stéphanie BedhommeAdam K Chippindale

Abstract

Intralocus sexual conflict can inhibit the evolution of each sex towards its own fitness optimum. In a previous study, we confirmed this prediction through the experimental removal of female selection pressures in Drosophila melanogaster, achieved by limiting the expression of all major chromosomes to males. Compared to the control populations (C(1-4)) where the genomes are exposed to selection in both sexes, the populations with male-limited genomes (ML(1-4)) showed rapid increases in male fitness, whereas the fitness of females expressing ML-evolved chromosomes decreased. Here we examine the behavioural phenotype underlying this sexual antagonism. We show that males expressing the ML genomes have a reduced courtship level but acquire the same number of matings. On the other hand, our data suggest that females expressing the ML genomes had reduced attractiveness, stimulating a lower rate of courtship from males. Moreover, females expressing ML genomes tend to display reduced yeast-feeding behaviour, which is probably linked to the reduction of their fecundity. These results suggest that reproductive behaviour is shaped by opposing selection on males and females, and that loci influencing attractiveness and foraging were polymo...Continue Reading

  • References50
  • Citations14
  • References50
  • Citations14

Citations

Mentioned in this Paper

Fertility
Y Chromosome
Genome
Conflict (Psychology)
Infertility Study
Reproduction
Sex Chromosomes
Recombination, Genetic
Dicom Derivation
Sexual Behavior, Animal

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