An experimental test of the dose-dependent effect of carotenoids and immune activation on sexual signals and antioxidant activity.
Fiche du document
2004
- doi: 10.1086/424971
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/doi/10.1086/424971
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/pmid/15540154
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/pissn/1537-5323[electronic]
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_F1F1EBC55D649
info:eu-repo/semantics/openAccess , Copying allowed only for non-profit organizations , https://serval.unil.ch/disclaimer
Sujets proches
Chromolipids Lipochromes Luteins CarotinoidsCiter ce document
C. Alonso-Alvarez et al., « An experimental test of the dose-dependent effect of carotenoids and immune activation on sexual signals and antioxidant activity. », Serveur académique Lausannois, ID : 10.1086/424971
Métriques
Partage / Export
Résumé
Carotenoid-based sexual traits are thought to be reliable indicators of male quality because they might be scarce and therefore might indicate the ability of males to gather high-quality food and because they are involved in important physiological functions (as immune enhancers and antioxidants). We performed an experiment where male and female zebra finches (Taeniopygia guttata) were provided with increasing carotenoid doses in the drinking water during 4 weeks (bill color of this species is a carotenoid-based sexual signal). Simultaneously, birds were split into two groups: one receiving weekly injections of Escherichia coli lipopolysaccharide in order to activate the immune system, the other being injected with the same volume of phosphate buffered saline. We assessed how carotenoid availability and immune activation affected the amount of circulating plasma carotenoids, the beak color, and the antioxidant defenses (assessed as the resistance of red blood cells to a controlled free radical attack). Carotenoid availability affected the amount of circulating carotenoids and beak color; both variables reached a plateau at the highest carotenoid doses. Immune activation diverted carotenoids from plasma, and this in turn affected the expression of the sexual trait. Finally, we found a positive correlation between the change in circulating carotenoids and antioxidant defenses. These results support the idea that carotenoids have important physiological properties that ensure the honesty of carotenoid-based sexual traits.