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Oecologia

, Volume 137, Issue 1, pp 153–158 | Cite as

Why do melanin ornaments signal individual quality? Insights from metal element analysis of barn owl feathers

  • Manfred Niecke
  • Sven Rothlaender
  • Alexandre RoulinEmail author
Behavioural Ecology

Abstract

Melanin-based variation in colour patterns is under strong genetic control and not, or weakly, sensitive to the environment and body condition. Current signalling theory predicts that such traits may not signal honestly phenotypic quality because their production does not entail a significant fitness cost. However, recent studies revealed that in several bird species melanin-based traits covary with phenotypic attributes. In a first move to understand whether such covariations have a physiological basis, we quantified concentrations of five chemical elements in two pigmented plumage traits in the barn owl (Tyto alba). This bird shows continuous variation from immaculate to heavily marked with black spots (plumage spottiness) and from dark reddish-brown to white (plumage coloration), two traits that signal various aspects of individual quality. These two traits are sexually dimorphic with females being spottier and darker coloured than males. We found an enhancement in calcium and zinc concentration within black spots compared with the unspotted feather parts. The degree to which birds were spotted was positively correlated with calcium concentration within spots, whereas the unspotted feather parts of darker reddish-brown birds were more concentrated in zinc. This suggests that two different pigments are responsible for plumage spottiness and plumage coloration. We discuss the implications of our results in light of recent experimental field studies showing that female spottiness signals offspring humoral response towards an artificially administrated antigen, parasite resistance and fluctuating asymmetry of wing feathers.

Keywords

Calcium Genetic colour polymorphism Immunocompetence Tyto alba Zinc 

Notes

Acknowledgements

We thank Anne-Lyse Ducrest, the late Martin Epars and Henri Etter for their help during the fieldwork and Willy Rehpenning for his help in accelerator maintenance. Pierre Bize, Anne-Lyse Ducrest and two anonymous referees provided useful comments on a first draft of this paper. Fieldwork was under the legal authorisation of the Service vétérinaire du canton de Vaud. A.R. was supported by a grant of the Swiss Science Foundation (grant no. 823A-064710). We are grateful to Cor Dijkstra and Guido Meeuwissen for having sexed nestlings using the CHD method.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Manfred Niecke
    • 1
  • Sven Rothlaender
    • 1
  • Alexandre Roulin
    • 2
    Email author
  1. 1.Institut für ExperimentalphysikUniversität Hamburg HamburgGermany
  2. 2.Department of ZoologyUniversity of CambridgeCambridgeUK

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