Abstract
A great number of secondary sexual traits are assumed to have evolved as honest signals of individual quality. It is known that androgens regulate many male secondary traits as well as reproductive behavior. The expression of melanin-based coloration is modulated by androgens, particularly testosterone, and there is some evidence that carotenoid-based coloration may also be under androgen control. In the European serin, Serinus serinus, male carotenoid-based plumage coloration is a sexually selected trait, subjected to female choice. In this experiment, we investigated if testosterone influences the expression of this trait by manipulating testosterone levels during molt and assessing how it affected plumage color expression after molt. We found that testosterone had only a negative effect on the size of the yellow ornament. Our experiment shows that testosterone had a limited effect on carotenoid-based coloration of a cardueline finch.
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Acknowledgments
Research was supported by Fundação para a Ciência e a Tecnologia (FCT) grant to ST (SFRH/BD/44837/2008) and by the project PTDC/BIA-BEC/105325/2008 to PGM. We are grateful to Ana Leitão for her help with capture and housing of birds, and also for assistance in the implantation procedure and Ana Sofia Félix from ISPA who performed the RIA analyses for determination of or plasma testosterone levels. All procedures were licensed by the Portuguese government agency ICNF (48/2012/CAPT).
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Trigo, S., Mota, P.G. A test of the effect of testosterone on a sexually selected carotenoid trait in a cardueline finch. Ecol Res 30, 25–31 (2015). https://doi.org/10.1007/s11284-014-1201-y
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DOI: https://doi.org/10.1007/s11284-014-1201-y