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Strength and cost of an induced immune response are associated with a heritable melanin-based colour trait in female tawny owls
Article first published online: 13 JAN 2009
DOI: 10.1111/j.1365-2656.2008.01521.x
© 2009 The Authors. Journal compilation © 2009 British Ecological Society
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How to Cite
Gasparini, J., Bize, P., Piault, R., Wakamatsu, K., Blount, J. D., Ducrest, A.-L. and Roulin, A. (2009), Strength and cost of an induced immune response are associated with a heritable melanin-based colour trait in female tawny owls. Journal of Animal Ecology, 78: 608–616. doi: 10.1111/j.1365-2656.2008.01521.x
Publication History
- Issue published online: 31 MAR 2009
- Article first published online: 13 JAN 2009
- Received 9 April 2008; accepted 12 December 2008Handling Associate Editor: Simon Verhulst
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Keywords:
- antibody production;
- colour polymorphism;
- cross-fostering;
- immunity;
- melanin;
- parasites
Summary
- 1Melanin pigments provide the most widespread source of coloration in vertebrates, but the adaptive function of such traits remains poorly known.
- 2In a wild population of tawny owls (Strix aluco), we investigated the relationships between plumage coloration, which varies continuously from dark to pale reddish, and the strength and cost of an induced immune response.
- 3The degree of reddishness in tawny owl feather colour was positively correlated with the concentration of phaeomelanin and eumelanin pigments, and plumage coloration was highly heritable (h2 = 0·93). No carotenoids were detected in the feathers.
- 4In mothers, the degree of melanin-based coloration was associated with antibody production against a vaccine, with dark reddish females maintaining a stronger level of antibody for a longer period of time compared to pale reddish females, but at a cost in terms of greater loss of body mass.
- 5A cross-fostering experiment showed that, independent of maternal coloration, foster chicks reared by vaccinated mothers were lighter than those reared by nonvaccinated mothers. Hence, even though dark reddish mothers suffered a stronger immune cost than pale reddish mothers, this asymmetric cost was not translated to offspring growth.
- 6Our study suggests that different heritable melanin-based colorations are associated with alternative strategies to resist parasite attacks, with dark reddish individuals investing more resources towards the humoral immune response than lightly reddish conspecifics.