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Title

Condition- and parasite-dependent expression of a male-like trait in a female bird

AuthorsMartínez-Padilla, Jesús ; Vergara, Pablo ; Pérez-Rodríguez, Lorenzo ; Mougeot, François ; Casas, Fabián; Ludwig, S.; Zeineddine, Mohammed; Redpath, Steve
KeywordsComb size
Female
Trichostrongylus tenuis
Red grouse
Body condition
Issue Date2011
PublisherRoyal Society (Great Britain)
CitationBiology Letters 7(3): 364-367 (2011)
AbstractIn many species, females display brightly coloured and elaborate traits similar to those that males use in intra- and inter-sexual selection processes. These female characters are sometimes related to fitness, and might function as secondary sexual characteristics that have evolved through sexual selection. Here, we used descriptive data from 674 females in 10 populations and an experimental removal of Trichostrongylus tenuis parasites in four populations, to examine the effects of season, age, condition, and parasites on the size of supraorbital combs displayed by female red grouse Lagopus lagopus scoticus. We found that comb size (i) was greater during the breeding than the non-breeding season, (ii) was greater in adult than in young females, (iii) was positively correlated with body condition, and (iv) negatively correlated with parasite abundance. Experimentally, we showed that comb size increased proportionally to the number of worms removed after parasite dosing. Our findings provide a better understanding of proximate mechanisms behind the expression of a male-like trait in females, and we discuss its possible function as a female ornament.
URIhttp://hdl.handle.net/10261/143733
DOI10.1098/rsbl.2010.0991
Identifiersdoi: 10.1098/rsbl.2010.0991
issn: 1744-9561
e-issn: 1744-957X
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