La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Dispersal of little egrets egretta garzetta from northern spanish atlantic colonies (2016)
Auteurs :	Aitor Galarza, Auteur ; Fernando Arce, Auteur ; Juan G. Navedo, Auteur ; Juan Arizaga, Auteur
Type de document :	Article
Dans :	Ardeola (63(2) SEP 2016)
Article en page(s) :	375-382
Résumé :	We studied the movements of little egrets Egretta garzetta from breeding colonies in northern Spanish Atlantic estuaries using sighting data of colour-ringed birds. Data on 304 resightings of 95 out of 457 little egrets ringed as chicks in two colonies on the southern Bay of Biscay were analysed. Most egrets (68.9%) were observed less than 50 km from their natal colonies and thus exhibited low dispersal, supporting the view that these birds belong to a resident population breeding along the coasts of the Bay of Biscay. Nearly all resightings (95.5%) occurred in estuaries across an east-west axis corresponding to the Atlantic coast of northern Spain and had a west-biased dispersal direction. We suggest that the recently formed northern Atlantic Spanish population is a consequence of a westward colonisation pattern originating in the French Atlantic colonies.

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