Dietary lipids reduce the expression of carotenoid-based coloration in Lacerta vivipara

Détails

ID Serval
serval:BIB_3847CFFFA1D4
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Dietary lipids reduce the expression of carotenoid-based coloration in Lacerta vivipara
Périodique
Functional Ecology
Auteur(s)
San Jose L.M., Granado-Lorencio F., Fitze P.S.
ISSN
0269-8463
Statut éditorial
Publié
Date de publication
2012
Peer-reviewed
Oui
Volume
26
Numéro
3
Pages
646-656
Langue
anglais
Résumé
1. The importance of dietary lipids for carotenoid-based ornaments has rarely been investigated, although theory predicts that dietary lipids may control the development of these widespread animal signals. Dietary lipids have been suggested to enhance the expression of male carotenoid-based ornaments because they provide carotenoids with a hydrophobic domain that facilitates their absorption and transport. Dietary lipids may also enhance the uptake of tocopherols (vitamin E), which share common absorption and transport routes with carotenoids. Here, we test whether dietary lipids enhance carotenoid availability and male carotenoid-based colorations. We also explore the effects of dietary lipids on plasma tocopherol concentration, which allow disentangling between different pathways that may explain how dietary lipids affect ornamental expression.
2. Following a two-factorial design, we manipulated dietary access of naturally occurring fatty acids (oleic acid) and carotenoids (lutein and zeaxanthin) and measured its effects on the circulating concentrations of carotenoids (lutein and zeaxanthin) and vitamin E (α- and γ-(β-) tocopherols) and on the ventral, carotenoid-based coloration of male common lizards (Lacerta vivipara).
3. Lutein but not zeaxanthin plasma concentrations increased with carotenoid supplementation, which, however, did not affect coloration. Lipid intake negatively affected circulating concentrations of lutein and γ-(β-) tocopherol and led to significantly less orange colorations. The path analysis suggests that a relationship between the observed colour change and the change in plasma concentrations of γ-(β-) tocopherol may exist.
4. Our study shows for the first time that dietary lipids do not enhance but reduce the intensity of male carotenoid-based ornaments. Although dietary lipids affected plasma carotenoid concentration, its negative effect on coloration appeared to be linked to lower vitamin E plasma concentrations. These findings suggest that a conflict between dietary lipids and carotenoid and tocopherol uptake may arise if these nutrients are independently obtained from natural diets and that such conflict may reinforce signal honesty in carotenoid-based ornaments. They also suggest that, at least in the common lizard, sexual selection with respect to carotenoid-based coloration may select for males with low antioxidant capacity and thus for males of superior health.
Mots-clé
carotenoid-based ornaments, fat intake, protection hypothesis, signal honesty, sparing hypothesis, tocopherol, visual signals, vitamin E
Web of science
Création de la notice
23/01/2012 20:16
Dernière modification de la notice
20/08/2019 13:27
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