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Titre :	Ten years of observation of colour-ringed large gulls in Hannover
Auteurs :	Konrad Thye, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (127(1) 2006)
Article en page(s) :	1-9
Résumé :	In Hannover (Lower Saxony, northern Germany), 894 colour-rings and/or wing-tags of large gulls were identified in the period from 1995 to 2004. Herring Gull Larus argentatus was the most common species with 96.8%; among the other species Caspian Gulls L cachinnans and Yellow-legged Gulls L. michahellis accounted for 1.2% and 1.3%, respectively, corresponding to their share of the wintering population in Hannover. The majority of the gulls observed originated from German, Danish and Finnish breeding colonies. 29% of the gulls stayed in the area for a longer period of time, 20% overwintered in Hannover. Independently of their origin and the number of individuals involved the migration and overwintering strategies are apparently similar for all large gulls. Rubbish tips for domestic refuse are of central importance as feeding and roosting areas. First-winter birds accounted for the majority of the birds studied with approximately 52%; with increasing age the number of wintering individuals dropped noticeably. Some selected cases of high age, typical and atypical migration patterns and the survival of injured birds are described. The possible development after the closure of rubbish tips for domestic refuse in Germany in 2005 is briefly discussed. Colour-ringing schemes are thought to be of value in the future as well.

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