Abstract
Many colourful sexually selected signals in animals are carotenoid-dependent and, because carotenoids function as antiradicals and immunostimulating molecules, carotenoid-dependent signals may honestly reflect the health state of individuals. Some others nutrients like vitamin A may also enhance health and colouration, but these have rarely been tested alongside carotenoids in colourful birds. Here, we examined whether beak colour of the spotless starling (Sturnus unicolor) reflected circulating levels of carotenoids and/or vitamin A (retinol). Spotless starlings are polygynous, sexually dimorphic birds (i.e. length of chest feathers). The tip of the beaks of male and female spotless starlings is more intensely coloured at the beginning of the breeding season and becomes dull after mating, which may suggest a sexual function. We found that females have a more intensely coloured beak and higher plasma carotenoid concentration than males during mating, and, despite the finding that carotenoid and vitamin A levels were not significantly related; colour intensity was positively correlated with plasma concentration of carotenoids and vitamin A in both sexes. However, adult beak coloration was not associated with carotenoid and vitamin A concentrations after nestlings were hatched. Therefore, beak colouration of spotless starlings provides information about circulating levels of carotenoids and vitamins during the mating season and may potentially function as a reliable signal of physiological status in the context of sexual selection.
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Acknowledgments
We thank A.P. Møller and two anonymous referees for their comments on the manuscript. This research was funded by the Spanish Ministry of Education and Science and European founds (FEDER) (CGL2004-01777/BOS, CGL2007-61251). CN was supported by a predoctoral grant from the Spain's Ministry of Science and Technology (BES-2005-8619). The authorization for carrying out the experimental work on animals in the field was granted by the Dirección General de Gestión del Medio Natural of the Consejería de Medio Ambiente of Junta de Andalucía.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00265-010-0978-0
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Navarro, C., Pérez-Contreras, T., Avilés, J.M. et al. Beak colour reflects circulating carotenoid and vitamin A levels in spotless starlings (Sturnus unicolor). Behav Ecol Sociobiol 64, 1057–1067 (2010). https://doi.org/10.1007/s00265-010-0920-5
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DOI: https://doi.org/10.1007/s00265-010-0920-5