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Condition and androgen levels: are condition-dependent and testosterone-mediated traits two sides of the same coin?
|Authors:||Pérez-Rodríguez, Lorenzo CSIC ORCID; Blas, Julio CSIC ORCID ; Viñuela, Javier CSIC ORCID; Marchant, Tracy A.; Bortolotti, Gary R.||Issue Date:||Jul-2006||Publisher:||Elsevier||Citation:||ANIMAL BEHAVIOUR, 2006, 72, 97–103||Abstract:||The immunocompetence handicap hypothesis posits that androgen-mediated signals honestly indicate the responsiveness of the immune system because of the immunosuppressive effect of androgens. How- ever, androgen levels may also be related to nutritional status, and differences in body condition could be a more parsimonious explanation for variation in the expression of the signal. We maintained captive male red-legged partridges, Alectoris rufa, under regulated food shortage until they reached 85% of their initial body mass. Controls were provided with food ad libitum. After food shortage, experimental birds had lower androgen and higher corticosterone levels than controls. The condition dependence in andro- gen levels suggests that androgen-mediated signals could be indicating general nutritional state rather than immune function speciﬁcally. We propose that androgen-dependent signals may act as indicators of body condition or indicators of immune system quality, depending on the nutritional status of the individual.||Publisher version (URL):||http://dx.doi.org/10.1016/j.anbehav.2005.09.021||URI:||http://hdl.handle.net/10261/36074||DOI:||10.1016/j.anbehav.2005.09.021|
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