Carotenoid-based bill and eye ring coloration as honest signals of condition: an experimental test in the red-legged partridge (Alectoris rufa)

@article{PrezRodrguez2008CarotenoidbasedBA,
  title={Carotenoid-based bill and eye ring coloration as honest signals of condition: an experimental test in the red-legged partridge (Alectoris rufa)},
  author={Lorenzo P{\'e}rez-Rodr{\'i}guez and Javier Vi{\~n}uela},
  journal={Naturwissenschaften},
  year={2008},
  volume={95},
  pages={821-830}
}
Carotenoid pigments cannot be synthesized by vertebrates but must be ingested through the diet. As they seem to be a limited resource, carotenoid-based ornaments are particularly interesting as possible honest signals of individual quality, in particular of foraging efficiency and nutritional status. Some studies have demonstrated the condition dependence of carotenoid-based plumage in birds. However, many other carotenoid-pigmented bare parts (i.e. skin, caruncles, bills, cere, and tarsi) are… CONTINUE READING
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