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Longitudinal training dams mitigate effects of shipping on environmental conditions and fish density in the littoral zones of the river Rhine.
Collas, F P L; Buijse, A D; van den Heuvel, L; van Kessel, N; Schoor, M M; Eerden, H; Leuven, R S E W.
Afiliação
  • Collas FPL; Department of Environmental Science, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands; Department of Animal Ecology and Ecophysiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands; Netherlands Centre of Expertise on Ex
  • Buijse AD; Department of Freshwater Ecology and Water Quality, Deltares, Delft, The Netherlands. Electronic address: Tom.Buijse@deltares.nl.
  • van den Heuvel L; Department of Environmental Science, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands. Electronic address: lotte.heuvel@student.ru.nl.
  • van Kessel N; Department of Environmental Science, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands; Netherlands Centre of Expertise on Exotic Species (NEC-E), Nijmegen, The Netherlands; Bureau Waardenburg bv, Culemborg, The Netherlands. Electronic address: nilsvankessel@gma
  • Schoor MM; Rijkswaterstaat Oost Nederland, Arnhem, The Netherlands. Electronic address: margriet.schoor@rws.nl.
  • Eerden H; Rijkswaterstaat Oost Nederland, Arnhem, The Netherlands. Electronic address: henk.eerden@rws.nl.
  • Leuven RSEW; Department of Environmental Science, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands; Department of Animal Ecology and Ecophysiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands; Netherlands Centre of Expertise on Ex
Sci Total Environ ; 619-620: 1183-1193, 2018 Apr 01.
Article em En | MEDLINE | ID: mdl-29734597
The stability of habitat conditions in littoral zones of navigated rivers is strongly affected by shipping induced waves and water displacements. In particular, the increase of variability in flow conditions diminishes the suitability of these habitats for juvenile fishes. Recently, a novel ecosystem based river management strategy has resulted in the replacement of traditional river training structures (i.e., groynes) by longitudinal training dams (LTDs), and the creation of shore channels in the river Waal, the main, free-flowing and intensively navigated distributary of the river Rhine in the Netherlands. It was hypothesized that these innovative LTDs mitigated the effects of shipping on fishes by maintaining the natural variability of habitat conditions in the littoral zones during ship passages whereby shore channels served as refugia for juvenile fishes. Measurements of abiotic conditions showed a significantly lower water level fluctuation and significantly higher flow stability in shore channels compared to groyne fields. Flow velocity did not differ, nor did the variation in flow velocity fluctuation during ship passage between these habitats. Densities of fish were found to be significantly higher in the littoral zones of shore channels compared to nearby groyne fields. Moreover, electrofishing along the inner side of the newly constructed LTD showed a significant linear relationship between fish density and distance from highly dynamic in- and outflow sections and to lowered inflow sections in the LTD. Results of our field sampling clearly indicate successful ecological rehabilitation of littoral zones that coincides with a facilitation of navigation in the main river channel and increased flood safety.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Navios / Monitoramento Ambiental / Rios / Peixes Limite: Animals País/Região como assunto: Europa Idioma: En Revista: Sci Total Environ Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Navios / Monitoramento Ambiental / Rios / Peixes Limite: Animals País/Região como assunto: Europa Idioma: En Revista: Sci Total Environ Ano de publicação: 2018 Tipo de documento: Article