Complex interactions with females and rival males limit the evolution of sperm offence and defence.

@article{Bjork2007ComplexIW,
  title={Complex interactions with females and rival males limit the evolution of sperm offence and defence.},
  author={Adam Bjork and William T. Starmer and Dawn M Higginson and Christopher J Rhodes and Scott Pitnick},
  journal={Proceedings. Biological sciences},
  year={2007},
  volume={274 1619},
  pages={1779-88}
}
Postcopulatory sexual selection favours males which are strong offensive and defensive sperm competitors. As a means of identifying component traits comprising each strategy, we used an experimental evolution approach. Separate populations of Drosophila melanogaster were selected for enhanced sperm offence and defence. Despite using a large outbred population and evidence of substantive genetic variation for each strategy, neither trait responded to selection in the two replicates of this… CONTINUE READING