Parasitized mates increase infection risk for partners

Jesus Martinez-Padilla, Pablo Vergara, Francois Mougeot, Stephen M. Redpath

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
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Individuals can gain fitness benefits and costs through their mates. However, studies on sexual selection have tended to focus on genetic benefits. A potentially widespread cost of pairing with a parasitized mate is that doing so will increase an individual's parasite abundance. Such a cost has been overlooked in systems in which parasites are indirectly transmitted. We manipulated the abundance of the nematode parasite Trichostrongylus tenuis, an indirectly transmitted parasite, within pairs of wild red grouse Lagopus lagopus scoticus in spring. Parasite levels were correlated within pairs before the experiment. We removed parasites from males, females, or both members of the pair and evaluated individual parasite uptake over the subsequent breeding period. At the end of the breeding season, an individual's parasite abundance was greater when its mate had not been initially purged of parasites. This cost appeared to be greater for males. We discuss the implications of our results in relation to the costs that parasites may have on sexual selection processes.

Original languageEnglish
Pages (from-to)811-820
Number of pages10
JournalThe American Naturalist
Issue number6
Early online date25 Apr 2012
Publication statusPublished - Jun 2012


  • red grouse
  • sexual selection
  • direct benefits
  • parasitism


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