The natural plasma testosterone profile of male blue tits during the breeding season and its relation to song output

Détails

ID Serval
serval:BIB_A0E094E34939
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The natural plasma testosterone profile of male blue tits during the breeding season and its relation to song output
Périodique
Journal of Avian Biology
Auteur(s)
Foerster. K, Poesel. A, Kunc. H Kempenaers, B. 
ISSN
0908-8857
Statut éditorial
Publié
Date de publication
2002
Peer-reviewed
Oui
Volume
33
Numéro
3
Pages
269-275
Langue
anglais
Résumé
In male birds, the gonadal hormone testosterone (T) is known to influence territorial and mating behaviour. Plasma levels of T show seasonal fluctuations which vary in relation to mating system and social instability. First, we determined the natural T profile of male blue tits Parus caeruleus during the breeding season. We found that plasma levels of T increased at the onset of nest building. Thus, the increase in circulating T was not associated with territory establishment, nor with the fertile period of the males' mates. In most individuals, T levels dropped to values close to zero during the period of chick feeding. Second, we investigated the relationship between plasma levels of T and male age, size, and singing behaviour. During the mating period, T levels did not differ between 1 yr old and older males and did not correlate with body size or condition. However, song output during the dawn chorus tended to be positively correlated with T levels. Therefore, if high T levels are costly, song output might be an honest indicator of male quality in blue tits. Finally, we show that plasma levels of T are significantly higher during the night than during the day. This pattern has also been observed in captive non-passerine birds, but its functional significance remains unknown.
Mots-clé
Vertebrata , Aves , Androgen , Breeding behavior , Reproduction , Europe , Parus caeruleus , Austria , Time variation , Breeding success , Chemical concentration , Plasma , Testosterone , Defensive behavior , Sexual behavior , Territorial behavior , Breeding season , Male , Paridae , Vertebrata , Aves , Androgène , Comportement reproducteur , Reproduction , Europe , Parus caeruleus , Autriche , Variation temporelle , Succès reproducteur , Concentration chimique , Plasma , Testostérone , Comportement défensif , Comportement sexuel , Comportement territorial , Saison reproduction , Mâle , Vertebrata , Aves , Andrógeno , Conducta reproductora , Reproducción , Europa , Parus caeruleus , Austria , Variación temporal , Exito reproductor , Concentración química , Plasma , Testosterona , Conducta defensiva , Conducta sexual , Conducta territorial , Temporada reproducción , Macho ,
Création de la notice
18/03/2008 11:35
Dernière modification de la notice
20/08/2019 16:06
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