EcoHealth

, Volume 5, Issue 3, pp 328–337 | Cite as

Environmental Pollution Affects the Plumage Color of Great Tit Nestlings through Carotenoid Availability

  • Tapio Eeva
  • Saila Sillanpää
  • Juha-Pekka Salminen
  • Lauri Nikkinen
  • Anu Tuominen
  • Eija Toivonen
  • Kalevi Pihlaja
  • Esa Lehikoinen
Article

Abstract

Birds need to acquire carotenoids for their feather pigmentation from their diet, which means that their plumage color may change as a consequence of human impact on their environment. For example, the carotenoid-based plumage coloration of Great tit, Parus major, nestlings is associated with the degree of environmental pollution. Breast feathers of birds in territories exposed to heavy metals are less yellow than those in unpolluted environments. Here we tested two hypotheses that could explain the observed pattern: (I) deficiency of carotenoids in diet, and (II) pollution-related changes in transfer of carotenoids to feathers. We manipulated dietary carotenoid levels of nestlings and measured the responses in plumage color and tissue concentrations. Our carotenoid supplementation produced the same response in tissue carotenoid concentrations and plumage color in polluted and unpolluted environments. Variation in heavy metal levels did not explain the variation in tissue (yolk, plasma, and feathers) carotenoid concentrations and was not related to plumage coloration. Instead, the variation in plumage yellowness was associated with the availability of carotenoid-rich caterpillars in territories. Our results support the hypothesis that the primary reason for pollution-related variation in plumage color is carotenoid deficiency in the diet.

Keywords

carotenoids bioindicator heavy metal pollution oxidative stress Parus major plumage color 

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Copyright information

© International Association for Ecology and Health 2008

Authors and Affiliations

  • Tapio Eeva
    • 1
  • Saila Sillanpää
    • 1
  • Juha-Pekka Salminen
    • 2
  • Lauri Nikkinen
    • 1
  • Anu Tuominen
    • 2
  • Eija Toivonen
    • 1
  • Kalevi Pihlaja
    • 2
  • Esa Lehikoinen
    • 1
  1. 1.Section of EcologyUniversity of TurkuTurkuFinland
  2. 2.Laboratory of Organic Chemistry and Chemical BiologyUniversity of TurkuTurkuFinland

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