Immunocompetence and nestling survival in the house martin: the tasty chick hypothesis

Détails

ID Serval
serval:BIB_2A4E066AFD0E
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Immunocompetence and nestling survival in the house martin: the tasty chick hypothesis
Périodique
Oikos
Auteur(s)
Christe P., Møller A. P., de Lope F.
ISSN
0030-1299
Statut éditorial
Publié
Date de publication
1998
Peer-reviewed
Oui
Volume
83
Numéro
1
Pages
175-179
Langue
anglais
Notes
http://www.jstor.org/stable/3546559
Résumé
In altricial birds post-fledging survival is usually positively related to nestling body mass. A large number of studies have shown that the latest hatched chick is the more likely to die, even if food is abundant. Here we suggest that ectoparasites may be a key factor in the evolution and the maintenance of the establishment of weight hierarchies within broods. We prepose the hypothesis that weight hierarchies within broods may be adaptive if the chick in poor condition is the one with the least efficient immune system within a nest. In this case parasites would preferentially feed on such a "tasty chick", because it would allow high reproductive rates for the parasites, without negatively affecting the survival of the other nestlings. This could prevent entire nest failure of the brood or allow the other chicks to grow more efficiently. This hypothesis was investigated in a colony of house martins Delichon urbica. We predicted that immunocompetence was positively correlated with body condition, and that nestlings dying before hedging should have lower immune responses when challenged with an antigen. T-cell immune response to an experimentally injected antigen was strongly positively related to body condition. Non-surviving chicks had low body condition and a weak immune response. The implications of these results are discussed in the context of the adaptive significance of hatching asynchrony.
Mots-clé
TITS PARUS-MAJOR, BROOD REDUCTION HYPOTHESIS, HATCHING ASYNCHRONY, GREAT TIT, REPRODUCTIVE SUCCESS, COLLARED FLYCATCHER, HIRUNDO-RUSTICA, BARN SWALLOWS, ROOST SITES, ECTOPARASITES
Web of science
Création de la notice
24/01/2008 20:14
Dernière modification de la notice
20/08/2019 14:09
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