La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Population development of Common Terns Sterna hirundo at Lake Constance and in Switzerland 1976 to 1997
Auteurs :	Herbert Stark, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (119(3-5) 1998)
Article en page(s) :	133-137
Résumé :	The breeding populations of Common Terns at Lake Constance and on the Swiss lowland lakes have increased in the past 21 years from a total of 389 pairs in 1976 to 513 pairs in 1997. The increase and range expansion were mainly due to the management of artificial nesting sites. In 1976 only 6 colonies existed, in 1993 a maximum was reached with terns breedin, at 17 localities. and in 1997 Common Terns bred at 14 localities. The largest colonies exist at Lake Neuchatel (200 pairs), in the Rheindelta at Lake Constance (120 pairs), at Verbois, Grangettes, Lengwiler Weiher (all in Switzerland, 40 pairs each), and in the Wollmatinger Ried in the German part of Lake Constance (30-40 pairs). The two colonies established on artificial nesting platforms at the shore of Lake Constance in the mid 1980s show very stable populations. The importance of a colony in the vicinity of Lake Constance, Lengwiler Weiher, increased considerably after breeding failures at Lake Constance due to very low water levels. Predation and breeding success in the larger colonies are discussed.

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