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Carotenoids, immune response and the expression of sexual ornaments in male greenfinches (Carduelis chloris)

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Abstract

Allocation trade-offs of carotenoids between their use in the immune system and production of sexual ornaments have been suggested as a proximate mechanism maintaining honesty of sexual signals. To test this idea, we experimentally examined whether carotenoid availability in the diet was related to variation in antibody response to novel antigens in male greenfinches (Carduelis chloris aurantiiventris), a species with extensive carotenoid-dependent plumage colouration. We also measured the cost of mounting a humoral response in terms of circulating carotenoids. Finally, we examined the relationship between plumage colour, immune response and circulating carotenoids. We found that males with carotenoid-supplemented diets showed stronger antibody response than non-supplemented birds. We also found that activation of the immune system significantly reduced circulating carotenoids (24.9% lower in immune-challenged birds than in control birds). Finally, intensity (chroma) of ventral plumage colouration of males, a character directly related to concentration of total carotenoids in feathers, was negatively correlated with the immune response and circulating carotenoids in winter. These results support the idea that carotenoids are a limiting resource and that males trade ornamental colouration against immune response.

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Acknowledgements

We thank Manolo Vázquez, Rocío Ruiz, María López and Nico Varo for assistance with trapping and taking care of birds, María José Torres for laboratory training and Tomás Redondo, Jordi Figuerola, Kevin McGraw and three anonymous referees for constructive criticisms on an earlier version of the manuscript. Financial support was provided by the Spanish DGESIC (project PB98-0494-C02-01).

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  1. Department of Evolutionary Biology, Estación Biológica de Doñana, CSIC, Apartado 1053, 41080, Seville, Spain

    Eduardo Aguilera & Juan A. Amat

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  1. Eduardo Aguilera
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  2. Juan A. Amat
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Correspondence to Eduardo Aguilera.

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Aguilera, E., Amat, J.A. Carotenoids, immune response and the expression of sexual ornaments in male greenfinches (Carduelis chloris). Naturwissenschaften 94, 895–902 (2007). https://doi.org/10.1007/s00114-007-0268-5

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  • DOI: https://doi.org/10.1007/s00114-007-0268-5

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