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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Spatio-temporal distribution patterns and foraging strategies of Herring gulls Larus argentatus from the Western Baltic Sea: Insights from a ringing recovery analysis.
Auteurs :	Nele Markones, Auteur ; Nils Guse, Auteur
Type de document :	Article
Dans :	Vogelwarte (45(1) FEB 2007)
Article en page(s) :	1-13
Langues:	Allemand
Résumé :	From 2001 to 2005, a total of 600 non-fledged chicks was ringed with metal and darvic colour rings in one of the largest Herring Gull colonies along the Baltic Sea coast of Schleswig-Holstein. An additional 143 chicks were ringed with metal rings only.Until 2 April 2006, the colour-ringed birds reached a recovery rate of 61.7%, while birds ringed with a metal ring only reached a recovery rate of 17.5%. Most of the 2768 recoveries originate from Eastern Schleswig-Holstein and other parts of the western Baltic Sea. Other recoveries were made along the North Sea coast of the Netherlands, Germany and also partly in Denmark. Several gulls were sighted in the northern half of the German inland area. The remotest recovery site was the French Blaringhem with a distance of 680 km from the breeding colony, where a colour-ringed gull was read in 2003 and 2005, respectively. The distance of the recovery sites decreases with increasing age of the gulls, but also depends on the season. Highest distances were reached in January/February while they were lowest during the breeding season. Most of the recoveries were made in the winter half of the year. More than half of the resightings took place at dump sites, a third in cities, harbours or at waterbodies, and only very few were made along natural coast sites. No fewer than 2/3 of all gulls ever recovered were sighted at least once at a dump site and more than half of them were sited at least once at a harbour. Several individuals were sighted exclusively in one of the different foraging habitats. An influence of specialised foraging strategies on survival was not detected, though an influence on the distribution is likely. The use of dump sites did not differ substantially between the different age classes. After the closure of most of the dump sites in 2005, only very low proportions of gulls were observed at tips in the following winter. It has to be taken into account that the activity of single observers had a substantial influence on the results of all analyses.

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