La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Influxes of Caspian gulls Larus cachinnans and yellow-legged gulls L-michahellis into northern Central Europe - origin, causes, course and trend
Auteurs :	Ronald Klein, Auteur ; Grzegorz Neubauer, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (127(2) 2006)
Article en page(s) :	91-97
Résumé :	Based on recoveries of ringed birds, the seasonal occurrence of Caspian Gull and Yellow-legged Gull in the German and Polish lowlands is described. Both taxa were recorded in highest numbers in late summer and autumn, with the majority of birds being juveniles. Whereas Caspian Gulls in Poland peaked in July and winter, maximum numbers from Germany fell into autumn with a lack of high concentrations in winter. Ringed Yellow-legged Gulls were mainly observed from July to November, but did not occur in Poland and at the German Baltic Sea coast in winter. The origin of the majority of Yellow-legged Gulls observed in northern Central Europe is the northern Adriatic Sea (Italy, Croatia), but a few also came from Tuscany (Italy) and Switzerland. Possible causes of influxe's are discussed and their probable routes shown in maps. It appears that Caspian Gull is.colonising Central Europe as a regular breeding bird, and it is expected that in future this species will outnumber Herring Gull and Yellow-legged Gull especially in the eastern part of the inland study area.

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