La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Loss of Common Tern Sterna hirundo breeding sites at rivers of the Alpine foothills in Bavaria and the potential for recolonization
Auteurs :	Stefan Raab, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (119(3-5) 1998)
Article en page(s) :	265-270
Résumé :	The original habitats of the Common Tern at the southern tributaries of the river Danube were the plain meanders. The straightened rivers lost their plain meanders and were transformed into channels. Furthermore, by a variety of river management methods the run of sediment load was reduced and the banks without vegetation and relatively free of high floods disappeared. As a consequence, tern colonies were deserted. As long as the rivers are restrained within the bank foundations, gravel islands can not develop and as long as the run of sediment load is reduced or even interrupted, there is no possibility for recolonization by Common Terns. The best potential for recolonization is at the river Isar in the "Ascholdinger-Pupplin-er Au", where the last colony existed until 1979.

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