La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Breeding success of the Great Cormorant, Phalacrocorax carbo Linnaeus, 1758, at Ramsar, northern Iran (2010)
Auteurs :	Ahmad Barati, Auteur ; Behrouz Behrouzi-Rad, Auteur
Type de document :	Article
Dans :	Zoology in the Middle East (50 2010)
Article en page(s) :	41-46
Langues:	Anglais
Résumé :	Factors influencing the breeding success of the Great Cormorant, Phalacrocorax carbo Linnaeus, 1758, were studied in the 2003 breeding season at the Ramsar colony in northern Iran. The mean brood size was 3.03, and early-breeders had significantly larger broods than later breeders. However, no statistically significant difference was found in the reproductive success between early and late breeders. There was no significant relationship between nest size and number of chicks fledged. The mean productivity was 2.88 young per breeding attempt, which means about 80% of eggs laid produced nestlings that reached the fledging stage. Daily nest survival was higher in the chick-rearing stage than in the incubation period, and most failures (ca. 60%) occurred during the incubation period. The results suggest that the Ramsar colony provides more favourable nesting conditions for Great Cormorants than do some of the other colonies studied throughout its range.

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