English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/102845
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Intra-sexual competition alters the relationship between testosterone and ornament expression in a wild territorial bird

AuthorsMartínez-Padilla, Jesús ; Pérez-Rodríguez, Lorenzo ; Mougeot, François ; Ludwig, S.; Redpath, Steve
KeywordsMales
Hormones
Condition-dependence
Red grouse
Sexual selection
Issue Date2014
PublisherElsevier
CitationHormones and Behavior 65(5): 435-444 (2014)
AbstractIn a reliable signalling system, individual quality is expected to mediate the costs associated with ornamental displays, with relatively lower costs being paid by individuals of higher quality. These relative costs should depend not only on individual quality, but also on levels of intra-sexual competition. We explored the current and delayed effects that testosterone implants have on bird ornamentation in populations with contrasted population densities, as a proxy for intra-sexual competition. In a replicated experiment, we manipulated testosterone in 196 yearling male red grouse Lagopus lagopus scoticus in autumn in populations of high and low levels of intra-sexual competition. Males were assigned to one of three exogenous testosterone (T) treatments: empty implants (T0), small T implants (T1) or larger T implants (T2). We monitored subsequent changes in testosterone levels, ornament size and carotenoid-based colouration, carotenoid levels and body condition from autumn to spring. Testosterone implants increased testosterone levels, comb redness and comb size, and decreased body condition but these effects depended on levels of intra-sexual competition. Specifically, T2-implanted birds increased testosterone levels and comb size more, and reduced body condition more, in populations where intra-sexual competition was low. In the following spring, testosterone levels of T2-treated birds kept increasing in populations where intra-sexual competition was high but not in populations where intra-sexual competition was low. Our results highlight that levels of intra-sexual competition alter the relationship between testosterone levels and ornament expression, influencing their condition-dependence; they also indicate that the outcome of standard hormone manipulation conducted in free-living animals vary depending on the population context.
Publisher version (URL)http://dx.doi.org/10.1016/j.yhbeh.2014.03.012
URIhttp://hdl.handle.net/10261/102845
DOI10.1016/j.yhbeh.2014.03.012
Identifiersdoi: 10.1016/j.yhbeh.2014.03.012
issn: 1095-6867
Appears in Collections:(EBD) Artículos
(IREC) Artículos
(EEZA) Artículos
Files in This Item:
File Description SizeFormat 
Testosterone ornamentation and competition HB Digital.pdf439,11 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.