Articles | Volume 18, issue 10
https://doi.org/10.5194/bg-18-3103-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-3103-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
25 May 2021
Research article |
| 25 May 2021
| 25 May 2021
Complex interactions of in-stream dissolved organic matter and nutrient spiralling unravelled by Bayesian regression analysis
Matthias Pucher
CORRESPONDING AUTHOR
WasserClusterLunz – Biologische Station GmbH, Lunz am See, Austria
Institute of Hydrobiology and Aquatic Ecosystem Management,
University of Natural Resources and Life Sciences, Vienna, Austria
Peter Flödl
Institute of Hydraulic Engineering and River Research, University of
Natural Resources and Life Sciences, Vienna, Austria
Daniel Graeber
Department Aquatic Ecosystem Analysis and Management (ASAM),
Helmholtz Centre for Environmental Research – UFZ, Magdeburg, Germany
Klaus Felsenstein
Department of Statistics, Vienna University of Technology, Vienna,
Austria
Thomas Hein
WasserClusterLunz – Biologische Station GmbH, Lunz am See, Austria
Institute of Hydrobiology and Aquatic Ecosystem Management,
University of Natural Resources and Life Sciences, Vienna, Austria
Gabriele Weigelhofer
WasserClusterLunz – Biologische Station GmbH, Lunz am See, Austria
Institute of Hydrobiology and Aquatic Ecosystem Management,
University of Natural Resources and Life Sciences, Vienna, Austria
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This preprint is open for discussion and under review for Biogeosciences (BG).
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In a lab study on Florida streams, we altered carbon and nitrogen levels to measure nitrate uptake by biofilms. After 48 hours, nitrate uptake increased, though the biofilm structure stayed the same. Bacteria-dominated biofilms responded to both carbon and nitrogen, while algae-dominated ones reacted more to nitrogen. Biofilms with high wastewater input did not show any changes in nitrate uptake. These findings help explain how streams can reduce pollution after nutrient pulses.
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Triggered by global warming, glacier melt is repeatedly reaching peak values year by year. This development leads to a continuous enlargement of glacier forelands, accompanied by increasing sediment availability and a change in meltwater runoff behavior. The study describes an essential development step of proglacial channel evolution using river engineering methods. This is relevant to adequately define glacifluvial processes and downstream sediment yields in these transitioning landscapes.
Michael Paster, Peter Flödl, Anton Neureiter, Gernot Weyss, Bernhard Hynek, Ulrich Pulg, Rannveig Øvrevik Skoglund, Helmut Habersack, and Christoph Hauer
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Manuscript not accepted for further review
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Glaciers experienced record-breaking melting rates in recent years. This development leads to a continuous enlargement of glacier forelands, accompanied by increasing sediment availability and altered meltwater runoff behavior. This study describes the final development step of the gradual meltwater channel evolution using river engineering techniques. This is relevant to adequately define high alpine fluvial processes and sediment yields in these transitional landscapes.
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Short summary
Dissolved organic matter is an important carbon source in aquatic ecosystems, yet the uptake processes are not totally understood. We found evidence for the release of degradation products, efficiency loss in the uptake with higher concentrations, stimulating effects, and quality-dependent influences from the benthic zone. To conduct this analysis, we included interactions in the equations of the nutrient spiralling concept and solve it with a Bayesian non-linear fitting algorithm.
Dissolved organic matter is an important carbon source in aquatic ecosystems, yet the uptake...
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