La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Distribution and numbers of the Great Cormorant Phalacrocorax carbo in Germany in January 2003 - results of the pan-German night roost census.
Auteurs :	Johannes Wahl, Auteur ; Thomas Keller, Auteur ; Christoph Sudfeldt, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (125(1) 2004)
Article en page(s) :	1-10
Résumé :	As part of the first pan-European Cormorant midwinter census Great Cormorants were counted at their night roosts in Germany in mid-January 2003. A total of 500 roosts were controlled (including 158 unoccupied roosts/waterbodies). In neighbouring countries close to the German border another 18 roosts were checked (two of which did not hold birds). Within Germany 33,568 Cormorants were recorded. Accounting for about 10% of the individuals being missed during the census, the total German midwinter population was estimated at c. 38,000 birds in January 2003. Compared to counts in the western federal states in the mid 1990s, numbers increased only slightly. However, the number of roosts rose by at least 25% in this region. Due to the low temperatures in the first half of January 2003, most water bodies in northern and eastern Germany were covered with ice. In these regions large roosts formed on the coast. Almost half (47%) of the night roosts held up to 50 birds, and only about 13% more than 200 birds (46% of all individuals). Trees were almost exclusively used as night roosts. By far most of the roosts were located at rivers and their back waters.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...