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Background The threatened, thick shelled river mussel (Unio crassus), a once abundant species of slow-running freshwater habitats, has experienced a dramatic decline in its two remaining populations in Luxembourg – in the Natura 2000 sites of the rivers Our and Sûre. A crucial problem of many river systems in central Europe is their heavy load of fine ...

Background The river Our has a transboundary basin in the Ardennes across Belgium, Germany and Luxembourg. In Luxembourg, the upper part of the basin is a site of Community interest (SCI) within the Natura 2000 network. It features 11 habitat types listed in the annexes of the EU Habitats Directive, three of which are priority. Of these, the pearl mussel ...