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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Species protection programme Baden-Wuerttemberg: The example of gravel breeders at the Upper Rhine Valley
Auteurs :	Martin Boschert, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (119(3-5) 1998)
Article en page(s) :	259-264
Résumé :	Within the framework of a Species Conservation Programme for Baden-Wurttemberg, the current threats of and potential conservation measures for bird species breeding in gravel pits, particularly Common Sandpiper and Common Tern, are discussed. The main threats facing these two species are destruction of breeding habitat and disturbance by human recreational activities. Natural habitats of Common Tern Sterna hirundo and Common Sandpiper Actitis hypoleucos along the river Rhine, i. e. uncanalized river courses with sparsely vegetated shingle and gravel banks or islands. have been destroyed or lost due to regulations, canalizations, and constructions for energy supply. A number of former breeding grounds along the Rhine were deserted and recolonization prevented by the massive increase in recreational activities or due to vegetational succession. The only sound (but hardly feasible) measure to save the few remaining breeding pairs of Common Sandpiper and to strengthen the population of Common Tern would be to restore the old course of the river Rhine to a pre-Tulla wild state. However, at present, partial renaturalization of the Rhine and its tributaries is only possible at some smaller river sections. Consequently, a lasting (re-)establishment or a preservation of the breeding population of the two species seems to be dependent mainly on a network of secondary breeding habitats. The continuous preservation and management of preferred breeding habitats (pioneer stages of succession) and the prevention of disturbances of these sites during the breeding season should be possible at some 100 sites along the Upper Rhine Valley (e.g. at gravel pits, power plants, river mouths, embankments, tips of peninsulas, gravel islands, and shingle banks).

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