A UV signal of offspring condition mediates context-dependent parental favouritism.

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_16AF1EE732BA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A UV signal of offspring condition mediates context-dependent parental favouritism.
Périodique
Proceedings of the Royal Society of London B Biological Sciences
Auteur(s)
Bize P., Piault R., Moureau B., Heeb P.
ISSN
0962-8452[print], 0962-8452[linking]
Statut éditorial
Publié
Date de publication
2006
Volume
273
Numéro
1597
Pages
2063-2068
Langue
anglais
Résumé
As fitness returns during a breeding attempt are context-dependent, parents are predicted to bias their food allocation within a brood from poor towards good condition nestlings when environmental conditions deteriorate. We tested this prediction in the Alpine swift and the European starling, two migratory bird species, by modifying an ultraviolet (UV) visual signal of condition in nestlings and exploring how parents allocate food to their young as the season progresses. We show in both species that: (i) UV light reflected by the body skin of offspring positively correlates with their stature (i.e. body mass and skeletal size) and (ii) parental favouritism towards young with more UV reflective skin gradually increases as the season progresses. Early-breeding parents supplied food preferentially to UV pale (i.e. small stature) nestlings, whereas late-breeding parents favoured UV bright offspring (i.e. large stature). These results emphasize that parents use UV signals of offspring condition to adjust their feeding strategies depending on the ecological context.
Mots-clé
Animals, Birds/physiology, Cues, Nesting Behavior, Passeriformes/physiology, Seasons, Ultraviolet Rays
Pubmed
Web of science
Création de la notice
19/11/2007 10:38
Dernière modification de la notice
20/08/2019 13:46
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