La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Numbers, distribution and protection of Black Terns Chlidonias niger breeding in Germany 1990-2003 with comparisons to the Netherlands.
Auteurs :	Hermann Hoetker, Auteur ; Jan van der Winden, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (126(3) 2005)
Article en page(s) :	179-186
Résumé :	After a strong decline the size of the population of Black Terns breeding in Germany and the Netherlands remained stable between 1990 and 2003. The number of breeding pairs in Germany fluctuated between 832 and 1002 without any apparent trend. The population in 2003 was c. 870 pairs. The breeding range of Black Terns in Germany is restricted to the north German plains. In 2002 about 77% of pairs nested on artificial breeding rafts. The strict protection of all existing and potential breeding sites of Black Terns in Germany is a prerequisite for the future stabilisation of the population. Disturbances at the colony sites have to be avoided, At present artificial nesting rafts are an unavoidable measure to protect the species in Germany. On the long term a more natural management of marshes that includes natural fluctuations of water levels and periodical floodings as well as the creation of new habitats are recommended for safeguarding the Black Tern population in northwest Europe.

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