La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Limited dispersal by Nazca boobies Sula granti
Auteurs :	K. P. Huyvaert, Auteur ; D. J. Anderson, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (35(1) JAN 2004)
Article en page(s) :	46-53
Langues:	Anglais
Résumé :	We documented natal and breeding dispersal at several spatial scales by Galapagos Nazca boobies Sula grand, a wide-ranging pelagic seabird. We found exceptionally low degrees of both types of dispersal despite these birds' vagility. Median natal dispersal distances were 26 m and 105 m for males and females, respectively. Median breeding dispersal distances for both sexes were 0 m. No natal or breeding dispersals occurred from our study site at Punta Cevallos, Isla Espa (n) over tilde ola to six other colonies in the Galapagos, but we did document four long-distance natal dispersals from Punta Cevallos to islands near the South American coast. Recaptures and dead recoveries of ringed birds showed long distance non-breeding movements to the Central American coast and elsewhere in the eastern Pacific, contrasting with the very limited dispersal to breeding sites.

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