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Lateral and longitudinal patterns of water physico-chemistry and trace metal distribution and partitioning in a large river floodplain

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Published in Science of the Total Environment. 2017, vol. 587-588, p. 248-257
Abstract Floodplain water bodies provide habitat to diversified ecological communities. Floodplains are also among the most impacted aquatic ecosystems. While the link between the lateral connectivity of floodplain sites to the main channel and their plant, fish and invertebrate communities was well established, detailed information on chemical characteristics and particularly on trace metal spatial distribution and partitioning is scarce. The aim of this study was to examine the link between the lateral connectivity and physico-chemical variables, their trace metal concentrations and partitioning as well as the upstream-downstream gradient of these parameters. In connected and disconnected water bodies of the Rhône River upstream and downstream of the city of Lyon, we measured major ions, dissolved organic carbon, trace metal concentrations (Al, Cr, Ni, Cu, Zn, Cd, Pb and U) in water, suspended particulate matter (SPM) and sediment. The results revealed a clear difference between connected and disconnected water bodies. pH, SPM, Na+, and NO3- concentrations were lower in disconnected sites while conductivity, DOC, Ca2+ and Mg2+ were higher. Conductivity and a part of the major ion concentrations increased in the downstream sections. Trace metal concentrations and partitioning varied between connected and disconnected sites. In the dissolved fraction, trace metal concentrations were higher in connected sites. In the surface sediment, concentrations were higher in disconnected sites for the majority of metals. The upstream-downstream gradient was less important than the connected-disconnected gradient. Only three metals in the dissolved fraction (Cu, Cd and Pb) showed a clear increase in downstream sections. Overall, the study shows that the functioning of floodplains produces strong spatial patterns concerning the concentrations and partitioning of trace metals. These findings improve our understanding of trace metal biogeochemistry in floodplains and have important applications for floodplain restoration projects.
Keywords Rhône RiverInvertebratesChannel connectivityTrace metalSedimentsSuspended particulate matter
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Full text
Structures
Research groups Environmental Biogeochemistry and Ecotoxicology
Ecology and Aquatic Biology
ISE Pôle Sciences
ISE Eau
ISE Biodiversité
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HUG PETER, Dorothea, CASTELLA, Emmanuel, SLAVEYKOVA, Vera. Lateral and longitudinal patterns of water physico-chemistry and trace metal distribution and partitioning in a large river floodplain. In: Science of the Total Environment, 2017, vol. 587-588, p. 248-257. https://archive-ouverte.unige.ch/unige:92346

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Deposited on : 2017-03-06

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