La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Philopatry and faithfulness to nest site in Cory's Shearwaters Calonectris diomedea at Selvagem Grande
Auteurs :	J. L. Mougin, Auteur ; J. P. Granadeiro, Auteur ; Christian Jouanin, Auteur ; F. Roux, Auteur
Type de document :	Article
Dans :	Ostrich (70(3-4) DEC 1999)
Article en page(s) :	229-232
Langues:	Anglais
Résumé :	Nearly fledged Gory's Shearwater Calonectris diomedea chicks at Selvagem Grande occasionally desert their nest sites during the night, but generally return before dawn. The temporary use of other nest sites is rare and lasts less than two days. Almost all chicks from Selvagem Grande return to the island for their first breeding attempt; very few breed at islands outside the archipelago. On Selvagem Grande, almost half the males return to their native colony whereas more than 90% of females recruit to other colonies. Inter-colony movements sometimes exceed 1 km, but, if they return to their native colony, both sexes settle within 20 m of their natal site. From the second breeding attempt onwards, most birds of both sexes are faithful to the nest site. On average, less than 20% of birds desert their former nest site each year, with a shift of about 4 m only. Most nest shifts follow a breeding failure or a temporary respite from breeding, and are accompanied by a switch in partners.

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