La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Passage migration of Wrynecks (Jynx torquilla) at the German Bight (Helgoland and Schleswig-Holstein) in the period 1965-1998.
Auteurs :	Guenther Busche, Auteur
Type de document :	Article
Dans :	Vogelwarte (42(4) August 2004)
Article en page(s) :	344-351
Langues:	Allemand
Résumé :	Passage of Wryneck in the German Bight varies between regions. On Helgoland the autumn migration (according to trapping results) dominates. In the west of Schleswig-Holstein with the Wadden Sea islands the spring migration is more evident. Larger numbers are also recorded in spring in other neighbouring regions. This phenomenon is interpreted as overshooting and possibly loop route. Spring migration (1965-1998) occurs on Helgoland in the period 16th April - 27th May (median 6th May). The values for Schleswig-Holstein are very similar: 13th April - 27th May (median 8th May). The autumn migration is also almost identical: 11th August - 1st October (median 30th August) for Helgoland and 7th August - 16th October (median 29th August) for Schleswig-l-iolstein. The present mean spring arrival date for Schleswig-Holstein (23rd April) is one week earlier than it was 60 years ago. The number of passage migrants of this species recorded in Schleswig-Holstein has decreased dramatically in the period 1965-1998. The decrease is related to the population declines recorded for northern Europe.

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