Abstract
River restoration is a central issue of present-day River Basin Management. Unfortunately, many studies have shown limited ecological improvements, hypothesizing catchment influences and missing donor populations as main impeding factors. This study evaluates the ecological status after restoration at 46 river reaches in light of catchment influences upstream. Three groups of environmental parameters were investigated: (i) riparian land use and (ii) physical habitat quality in different lengths upstream of the restorations and (iii) land use in the whole catchment upstream. Ecological quality ratios of standardized fish, invertebrate and macrophyte samples were used as response variables. The results imply that sub-catchment variables influence the ecological status more than local habitat improvements. In particular, fish and invertebrate ecological status was positively linked to percent deciduous forest upstream of restored sites, while macrophytes revealed an opposite trend. Furthermore, we found a strong linkage of site-scale ecological status and physical habitat quality up to 5 km upstream of the restorations; the more natural were riparian land use and river habitat quality upstream, the higher was the chance of a good ecological quality in restored reaches. We conclude that site-scale restoration measures are likely to be unsuccessful, if the sub-catchment physical habitat upstream is degraded.
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Acknowledgments
The collation of restoration data was funded by the Bundesamt für Naturschutz, Bonn, the Deutsche Bundesstiftung Umwelt, Bonn and the Hessisches Ministerium für Umwelt, ländlichen Raum und Verbraucherschutz, Wiesbaden. We would like to thank Peter Haase and Andrea Sundermann, Senckenberg Research Institute, Frankfurt, Planungsbüro Koenzen, Hilden and staff members of the Department of Aquatic Ecology at the University of Duisburg-Essen for providing additional data. The study was part of the research project WISER (Water bodies in Europe: Integrative Systems to assess Ecological status and Recovery) and has been funded by the European Union under the 7th Framework Programme, Theme 6 (Environment including Climate Change) (Contract No. 226273), www.wiser.eu.
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Guest editors: C. K. Feld, A. Borja, L. Carvalho & D. Hering / Water bodies in Europe: integrative systems to assess ecological status and recovery
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Lorenz, A.W., Feld, C.K. Upstream river morphology and riparian land use overrule local restoration effects on ecological status assessment. Hydrobiologia 704, 489–501 (2013). https://doi.org/10.1007/s10750-012-1326-3
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DOI: https://doi.org/10.1007/s10750-012-1326-3