Lagrangian profiles of riverine autotrophy, organic matter transformation, and micropollutants at extreme drought.

Autor: Kamjunke N; Helmholtz Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114 Magdeburg, Germany. Electronic address: norbert.kamjunke@ufz.de., Beckers LM; Helmholtz Centre for Environmental Research - UFZ, Department of Effect-Directed Analysis, Permoserstr. 15, 04318 Leipzig, Germany., Herzsprung P; Helmholtz Centre for Environmental Research - UFZ, Department Lake Research, Brückstr. 3a, 39114 Magdeburg, Germany., von Tümpling W; Helmholtz Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114 Magdeburg, Germany., Lechtenfeld O; Helmholtz Centre for Environmental Research - UFZ, Department of Analytics, Permoserstr. 15, 04318 Leipzig, Germany., Tittel J; Helmholtz Centre for Environmental Research - UFZ, Department Lake Research, Brückstr. 3a, 39114 Magdeburg, Germany., Risse-Buhl U; Helmholtz Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114 Magdeburg, Germany., Rode M; Helmholtz Centre for Environmental Research - UFZ, Department of Aquatic Ecosystem Analysis, Brückstraße 3a, D-39114 Magdeburg, Germany; Institute of Environmental Science and Geography, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany., Wachholz A; Helmholtz Centre for Environmental Research - UFZ, Department of Aquatic Ecosystem Analysis, Brückstraße 3a, D-39114 Magdeburg, Germany., Kallies R; Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Microbiology, Permoserstr. 15, 04318 Leipzig, Germany., Schulze T; Helmholtz Centre for Environmental Research - UFZ, Department of Effect-Directed Analysis, Permoserstr. 15, 04318 Leipzig, Germany., Krauss M; Helmholtz Centre for Environmental Research - UFZ, Department of Effect-Directed Analysis, Permoserstr. 15, 04318 Leipzig, Germany., Brack W; Helmholtz Centre for Environmental Research - UFZ, Department of Effect-Directed Analysis, Permoserstr. 15, 04318 Leipzig, Germany; Faculty of Biological Sciences, Goethe University Frankfurt, Max-von-Laue-Strasse, 13 60438 Frankfurt am Main, Germany., Comero S; European Commission, Joint Research Centre, Directorate D - Sustainable Resources, Unit D.02 Water and Marine Resources, Via E. Fermi 2749, T.P. 120, I-21027 Ispra, VA, Italy., Gawlik BM; European Commission, Joint Research Centre, Directorate D - Sustainable Resources, Unit D.02 Water and Marine Resources, Via E. Fermi 2749, T.P. 120, I-21027 Ispra, VA, Italy., Skejo H; European Commission, Joint Research Centre, Directorate D - Sustainable Resources, Unit D.02 Water and Marine Resources, Via E. Fermi 2749, T.P. 120, I-21027 Ispra, VA, Italy., Tavazzi S; European Commission, Joint Research Centre, Directorate D - Sustainable Resources, Unit D.02 Water and Marine Resources, Via E. Fermi 2749, T.P. 120, I-21027 Ispra, VA, Italy., Mariani G; European Commission, Joint Research Centre, Directorate D - Sustainable Resources, Unit D.02 Water and Marine Resources, Via E. Fermi 2749, T.P. 120, I-21027 Ispra, VA, Italy., Borchardt D; Helmholtz Centre for Environmental Research - UFZ, Department of Aquatic Ecosystem Analysis, Brückstraße 3a, D-39114 Magdeburg, Germany., Weitere M; Helmholtz Centre for Environmental Research - UFZ, Department of River Ecology, Brückstraße 3a, D-39114 Magdeburg, Germany.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Jul 01; Vol. 828, pp. 154243. Date of Electronic Publication: 2022 Mar 01.
DOI: 10.1016/j.scitotenv.2022.154243
Abstrakt: On their way from inland to the ocean, flowing water bodies, their constituents and their biotic communities are exposed to complex transport and transformation processes. However, detailed process knowledge as revealed by Lagrangian measurements adjusted to travel time is rare in large rivers, in particular at hydrological extremes. To fill this gap, we investigated autotrophic processes, heterotrophic carbon utilization, and micropollutant concentrations applying a Lagrangian sampling design in a 600 km section of the River Elbe (Germany) at historically low discharge. Under base flow conditions, we expect the maximum intensity of instream processes and of point source impacts. Phytoplankton biomass and photosynthesis increased from upstream to downstream sites but maximum chlorophyll concentration was lower than at mean discharge. Concentrations of dissolved macronutrients decreased to almost complete phosphate depletion and low nitrate values. The longitudinal increase of bacterial abundance and production was less pronounced than in wetter years and bacterial community composition changed downstream. Molecular analyses revealed a longitudinal increase of many DOM components due to microbial production, whereas saturated lipid-like DOM, unsaturated aromatics and polyphenols, and some CHOS surfactants declined. In decomposition experiments, DOM components with high O/C ratios and high masses decreased whereas those with low O/C ratios, low masses, and high nitrogen content increased at all sites. Radiocarbon age analyses showed that DOC was relatively old (890-1870 years B.P.), whereas the mineralized fraction was much younger suggesting predominant oxidation of algal lysis products and exudates particularly at downstream sites. Micropollutants determining toxicity for algae (terbuthylazine, terbutryn, isoproturon and lenacil), hexachlorocyclohexanes and DDTs showed higher concentrations from the middle towards the downstream part but calculated toxicity was not negatively correlated to phytoplankton. Overall, autotrophic and heterotrophic process rates and micropollutant concentrations increased from up- to downstream reaches, but their magnitudes were not distinctly different to conditions at medium discharges.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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