Male bill colour and age are associated with parental abilities and breeding performance in blackbirds - Archive ouverte HAL
Article Dans Une Revue Behav Ecol Sociobiol Année : 2005

Male bill colour and age are associated with parental abilities and breeding performance in blackbirds

Résumé

In monogamous bird species, male parental investment may influence offspring fitness and females may gain advantages through mating with males providing extensive paternal care. However, paternal care is a benefit that can only be assessed indirectly because mate choice precedes paternal activities. Individual quality and age, both signalled by morphological characteristics, may reflect parental abilities. Because they may reflect individual foraging abilities, carotenoid-based colorations have been proposed to honestly signal parental quality. The blackbird (Turdus merula), a socially monogamous species, exhibits biparental care and males show bills that vary from pale yellow to orange due to carotenoid pigments. In this study, we investigated whether male bill colour and age are associated with parental ability. Our results suggest that males with more orange bills and older males are better fathers. Indeed, male visit rate increased with their bill colour index independently of age, and brood condition was higher for adult males, compared to yearlings, independently of bill colour.Overall, the number of fledglings producedwas positively influenced by both the age of males and the colour intensity of their bills. Males with more orange bills and adults had a greater number of fledglings and these males also had higher levels of prolactin, a hormone known to promote parental care. This latter finding suggests that prolactin may be the link between carotenoid based colorations and the intensity of paternal effort. Thus, male bill colour seems to honestly reveal male physiological adjustment to paternal activities.

Dates et versions

hal-00188639 , version 1 (19-11-2007)

Identifiants

Citer

Marina Préault, Olivier Chastel, Frank Cézilly, Bruno Faivre. Male bill colour and age are associated with parental abilities and breeding performance in blackbirds. Behav Ecol Sociobiol, 2005, 58, pp.497-505. ⟨10.1007/s00265-005-0937-3⟩. ⟨hal-00188639⟩
222 Consultations
0 Téléchargements

Altmetric

Partager

More