La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Repeatability of breeding parameters in Arctic Skuas
Auteurs :	R. A. Phillips, Auteur ; R. W. Furness, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (29(2) JUN 1998)
Article en page(s) :	190-196
Langues:	Anglais
Résumé :	Established pairs of Arctic Skuas Stercorarius parasiticus showed high repeatability in clutch volume (both within and between years), moderate repeatability in laying dates, but low repeatability in chick growth. Males that changed partner showed no repeatability in clutch volume or chick growth but did show repeatability in laying date, whereas females that changed partner did not show repeatability in laying date or chick growth but did show repeatability in clutch volume (indicating that laying date is determined predominantly by male quality, and clutch volume by female quality). In addition, pairs with males in better body condition laid earlier in the season, and females in better body condition laid clutches of greater volume. We suggest that variation in timing of breeding of Arctic Skuas arises from differences between males in their ability to provide sufficient prey to get the partner into reproductive condition, but clutch volume may be constrained by the female's ability to store the resources for egg production.

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