Carotenoid‐based coloration correlates with the hatching date of Blue Tit Cyanistes caeruleus nestlings

@article{Janas2019CarotenoidbasedCC,
  title={Carotenoid‐based coloration correlates with the hatching date of Blue Tit
 Cyanistes caeruleus
 nestlings},
  author={Katarzyna Janas and Dorota Lutyk and Joanna Sudyka and Anna Dubiec and Lars Gustafsson and Mariusz Cichoń and Szymon M. Drobniak},
  journal={Ibis},
  year={2019}
}
Carotenoid‐based coloration occurs predominantly in adult birds, yet in some species from the family Paridae, this trait is also present at the nestling stage. One of the factors proposed to affect the expression of this trait in immature birds is hatching date. Here, using the avian tetrahedral colour space model, we examined the influence of hatching date on the breast carotenoid‐based plumage coloration of the Blue Tit Cyanistes caeruleus nestlings. Because Blue Tits are sexually dichromatic… 
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