Sperm competition selects beyond relative testes size in birds.

@article{Lpold2009SpermCS,
  title={Sperm competition selects beyond relative testes size in birds.},
  author={Stefan L{\"u}pold and George M. Linz and James W. Rivers and David F. Westneat and Timothy R. Birkhead},
  journal={Evolution; international journal of organic evolution},
  year={2009},
  volume={63 2},
  pages={391-402}
}
Sperm morphology varies considerably across taxa, and postcopulatory sexual selection is thought to be one of the main forces responsible for this diversity. Several studies have investigated the effects of the variation in sperm design on sperm function, but the consequences of variation in sperm design on testis morphology have been overlooked. Testes size or architecture may determine the size of the sperm they produce, and selection for longer sperm may require concomitant adaptations in… CONTINUE READING
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