Ecological survey of river habitat diversity : trans-boundary cooperation in the Ore Mountains (Krušné hory, Erzgebirge) =Ekologický průzkum diverzity říčního habitatu : přeshraniční spolupráce v Krušných horách

Abstract

Results of a trans-boundary ecological survey of the cross-border Rolava and Weisseritz river catchments in the Erzge- birge / Krušné hory are presented. An optimized method to assess the ecohydrological status of streams in keeping with the European Water Framework Directive has been developed. Guiding parameters for the hydromorphological survey were selected, used for (1) the German "Gewaesserstrukturguetekartierung" by the Field Survey method of the Laenderarbe- itsgemeinschaft Wasser, (2) the Czech EcoRivHab method and (3) the Czech HEM method that additionally comply with the requirements of the European Standard EN 14614. Hydro- chemical monitoring supported the interpretation of the hydrobiological data. The assess- ment followed the stream type specific background and orientation values. Hydrobiological monitoring focussed on benthic macroinvertebrates, stream type, and stressor specific as- sessment. Five ecohydrological quality classes were established from 1 (high) to 5 (bad), characterizing the state of the water course in the WFD context