Heritable true fitness and bright birds: a role for parasites?

@article{Hamilton1982HeritableTF,
  title={Heritable true fitness and bright birds: a role for parasites?},
  author={William D. Hamilton and Marlene Zuk},
  journal={Science},
  year={1982},
  volume={218 4570},
  pages={
          384-7
        }
}
Combination of seven surveys of blood parasites in North American passerines reveals weak, highly significant association over species between incidence of chronic blood infections (five genera of protozoa and one nematode) and striking display (three characters: male "brightness," female "brightness," and male song). This result conforms to a model of sexual selection in which (i) coadaptational cycles of host and parasites generate consistently positive offspring-on-parent regression of… Expand
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