Abstract
Purpose
Freshwater sediments and their attached microbial communities (biofilms) are essential features of rivers and lakes, providing valuable ecosystem services such as nutrient recycling or self-purification which extend beyond the aquatic environment. Anthropogenic pollutants, whether from the industrial era or as a result of our contemporary lifestyles, can negatively affect these functions with hitherto unknown consequences on ecology, the economy and human health. Thus far, the singular view of the involved disciplines such as ecotoxicology, environmental microbiology, hydrology and geomorphology has prevented a deeper understanding of this emerging issue.
Main features
This paper discusses briefly the progressions and the state-of-the-art methods within the disciplines of concern related to contaminated sediments, ranging from ecotoxicological test systems, microbiological/molecular approaches to unravel changes of microbial ecosystems, up to the modelling of sediment transport and sorption/desorption of associated pollutants. The first bilateral research efforts on contaminated sediments include efforts to assess ecotoxicological sediment risk including sediment mobility (i.e. ecotoxicology and engineering), enhance bioremediation potential (i.e. microbiology and ecotoxicology) or to understand biostabilisation processes of sediments by microbial assemblages (i.e. microbiology and engineering).
Conclusions and perspectives
In freshwater habitats, acute, chronic and mechanism-specific toxic effects on organisms, shifts in composition, structure and functionality of benthic microbial communities, as well as the obstruction of important ecosystem services by continuously discharged and long-deposited pollutants, should be related to the in situ sediment dynamics. To achieve an improved understanding of the ecology of freshwater sediments and the impairment of their important ecosystem functions by human-derived pollutants, we suggest a “triad plus x” approach combining advanced methods of ecotoxicology, environmental microbiology and engineering science.
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Acknowledgement
The authors are grateful for the financial support of this study. S.U. Gerbersdorf currently holds a Margarete-von-Wrangell Fellowship for postdoctoral lecture qualification, financed by the Ministry of Science, Research and the Arts (MSK) and the European Social Fund (ESF) of Baden-Württemberg. H. Hollert and M. Brinkmann are indebted to the Exploratory Research Space (ERS) at RWTH Aachen University, as part of the German Excellence Initiative, for funding of the Pathfinder project Floodsearch and the Boost-Funds project Floodsearch II.
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Gerbersdorf, S.U., Hollert, H., Brinkmann, M. et al. Anthropogenic pollutants affect ecosystem services of freshwater sediments: the need for a “triad plus x” approach. J Soils Sediments 11, 1099–1114 (2011). https://doi.org/10.1007/s11368-011-0373-0
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DOI: https://doi.org/10.1007/s11368-011-0373-0