Pale and dark reddish melanic tawny owls differentially regulate the level of blood circulating POMC prohormone in relation to environmental conditions.

Détails

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_1EBF315CC3CE
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Pale and dark reddish melanic tawny owls differentially regulate the level of blood circulating POMC prohormone in relation to environmental conditions.
Périodique
Oecologia
Auteur(s)
Roulin A., Emaresi G., Bize P., Gasparini J., Piault R., Ducrest A.L.
ISSN
1432-1939 (Electronic)
ISSN-L
0029-8549
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
166
Numéro
4
Pages
913-921
Langue
anglais
Résumé
Knowledge of the hormonal pathway controlling genotype-specific norms of reaction would shed light on the ecological factors to which each genotype is adapted. Environmentally mediated changes in the sign and magnitude of covariations between heritable melanin-based colouration and fitness components are frequent, revealing that extreme melanin-based phenotypes can display different physiological states depending on the environment. Yet, the hormonal mechanism underlying this phenomenon is poorly understood. One novel hypothesis proposes that these covariations stem from pleiotropic effects of the melanocortin system. Melanocortins are post-translationally modified bioactive peptides derived from the POMC prohormone that are involved in melanogenesis, anti-inflammation, energy homeostasis and stress responses. Thus, differential regulation of fitness components in relation to environmental factors by pale and dark melanic individuals may be due to colour-specific regulation of the POMC prohormone. Accordingly, we found that the degree of reddish melanic colouration was negatively correlated with blood circulating levels of the POMC prohormone in female tawny owls (Strix aluco) rearing a brood for which the size was experimentally reduced, but not when enlarged, and in females located in rich but not in poor territories. Our findings support the hypothesis that the widespread links between melanin-based colouration and fitness components may be mediated, at least in part, by the melanocortin system.
Mots-clé
Animals, Clutch Size, Environment, Female, Genetic Pleiotropy, Pigmentation, Pigments, Biological/metabolism, Pro-Opiomelanocortin/blood, Strigiformes/blood
Pubmed
Web of science
Création de la notice
09/02/2011 23:14
Dernière modification de la notice
20/08/2019 13:54
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