Sperm of colourful males are better protected against oxidative stress.

@article{Helfenstein2010SpermOC,
  title={Sperm of colourful males are better protected against oxidative stress.},
  author={Fabrice Helfenstein and Sylvain Losdat and Anders Pape M\oller and Jonathan D Blount and Heinz Richner},
  journal={Ecology letters},
  year={2010},
  volume={13 2},
  pages={213-22}
}
Sperm cells are highly vulnerable to free radicals, and sperm quality and male fertility are critically affected by oxidative stress. Recently, sexual ornaments, particularly carotenoid-based colourful traits, have been proposed to depend on a male's capacity to resist oxidative stress, and thus to signal sperm quality. We conducted an experimental test of this hypothesis on great tits Parus major, in which adults are sexually dichromatic in carotenoid-based breast plumage. We report the first… CONTINUE READING
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