Abstract
Carotenoids, as pigments with antioxidant and immunoregulatory properties, play a crucial role in developing chicks. Carotenoids must be acquired through diet and are relatively scarce, suggesting that their availability is a limiting factor leading to a trade-off between colour displays and physiological functions. However, potential differences in this trade-off between male and female chicks have been little studied. We manipulated carotenoid availability in 9 days old common tern Sterna hirundo chicks by supplementing their fish diet with four carotenoids during 9 days. Our aim was to examine sex-specific responses to the experimental increase of dietary carotenoids on plasma circulation, physiological and condition variables and successful fledging. Furthermore, to explore the functional and evolutionary basis of the trade-off, we studied the relationships among carotenoid concentration, mediated immune response and foot colouration. After treatment, control chicks showed decreasing plasma levels for most carotenoid types, whereas supplemented chicks had strong increases. Colour luminosity and saturation increased in both treatment groups, while hue only changed significantly towards redder feet in supplemented females. Supplemented chicks presented neither different T-cell-mediated immunity nor other differences compared to control chicks. Nevertheless, supplemented females showed tendencies towards decreased immune responses and increased δ15N signatures, and supplemented males towards greater body mass. Our results indicate colouration may have, in females, a signalling function as to compensate for immunological costs. In males, additional availability of carotenoids may contribute to improve the body condition. This study suggests that trade-off responses to carotenoid availability are sex-specific in tern chicks. Thus, parental carotenoid supply to chicks may be an unrecognised component in sex allocation.
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Acknowledgments
We thank the “Banter See team” in 2006, especially J. Sprenger. We are also grateful to J.M. Vilanova (Kemin Iberica) and R. Tena (DSM Nutritional Products) for kindly supplying dietary carotenoid supplements free of charges; to the Research Centre TERRAMARE, U. Pijanowska, and F. Bairlein for providing logistical and technical support, and to B. Metzger for invaluable help during the whole process. M.M.B. was supported by a postgraduate grant of the Generalitat de Catalunya (Spain) and J.G-S. was supported by a contract of the Program Ramon y Cajal funded by the Ministerio de Educación y Ciencia and Fondos FEDER. This project was done under licence of LAVES, Oldenburg, of the Stadt Wilhelmshaven and financially supported by the Deutsche Forschungsgemeinschaft (BE 916/8-2).
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Communicated by G. Heldmaier.
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Benito, M.M., González-Solís, J. & Becker, P.H. Carotenoid supplementation and sex-specific trade-offs between colouration and condition in common tern chicks. J Comp Physiol B 181, 539–549 (2011). https://doi.org/10.1007/s00360-010-0537-z
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DOI: https://doi.org/10.1007/s00360-010-0537-z