A sexually selected character displacement in flycatchers reinforces premating isolation

@article{Stre1997ASS,
  title={A sexually selected character displacement in flycatchers reinforces premating isolation},
  author={Glenn-Peter Stre and Truls Moum and Stanislav Bureš and Miroslav Král and Martin Adamjan and Juan Moreno},
  journal={Nature},
  year={1997},
  volume={387},
  pages={589-592}
}
Theory suggests that natural selection against the production of unfit hybrids may reinforce barriers to gene flow, eventually leading to reproductive isolation of differentiated populations. This mode of speciation may be achieved by female choice selecting for a divergence in male secondary sexual traits that facilitates species recognition. Although intuitively appealing, conclusive evidence for such reinforcement is generally lacking, and serious doubts have been raised about its validity… 

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