The ornament-condition relationship varies with parasite abundance at population level in a female bird

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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Environmental heterogeneity is expected to create variation in the ornament-condition relationship. This topic has been studied in males with less attention being given to females. Here, we explore inter-population variation in the relationship between the size of a male-like trait, supra-orbital combs, and body mass in female red grouse Lagopus lagopus scoticus. We used the abundance of the nematode Trichostrongylus tenuis, a parasite with strong negative effects on this species, as a proxy of environmental conditions. We studied six populations over 5 years and showed that the comb size-body mass relationship varied with mean parasite abundance, with stronger ornament-condition relationships in populations with higher parasite infection levels. Our study supports the idea that environmental conditions, and in particular parasite infection levels, may affect the reliability of female ornaments as condition indicators.

Original languageEnglish
Pages (from-to)897-902
Number of pages6
Issue number10
Early online date2 Aug 2011
Publication statusPublished - Oct 2011


  • environmental conditions
  • Lagopus lagopus scoticus
  • secondary sexual traits
  • sexual selection
  • Trichostrongylus tenuis
  • Lagopus-lagopus-scoticus
  • male rock ptarmigan
  • male red grouse
  • Trichostrongylus-tenuis
  • dependent expression
  • information-content
  • Eurasian kestrels
  • testosterone
  • trait
  • coloration

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