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Open AccessEditor’s ChoiceArticle

Dissolved Organic Matter Quality and Biofilm Composition Affect Microbial Organic Matter Uptake in Stream Flumes

1
Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, 1180 Vienna, Austria
2
Wasser Cluster Lunz—Biological Station GmbH, 3293 Lunz am See, Austria
*
Author to whom correspondence should be addressed.
Water 2020, 12(11), 3246; https://doi.org/10.3390/w12113246
Received: 9 September 2020 / Revised: 5 November 2020 / Accepted: 17 November 2020 / Published: 19 November 2020
(This article belongs to the Special Issue Transformation of Dissolved Organic Matter in Aquatic Landscapes)
Agriculture delivers significant amounts of dissolved organic matter (DOM) to streams, thereby changing the composition and biodegradability of the aquatic DOM. This study focuses on the interactive effects of DOM quality and biofilm composition on the degradation of DOM in a laboratory flume experiment. Half of the flumes were exposed to light to stimulate algal growth, the other half was shaded. Leachates of deciduous leaves, maize leaves, and cow dung were added to the flumes in a single pulse and changes of DOC (dissolved organic carbon) and nutrient concentrations, DOM composition (absorbance and fluorescence data), chlorophyll-a concentrations, bacterial abundances, and enzymatic activities were recorded over a week. DOM was taken up with rates of 50, 109, and 136 µg DOC L−1 h−1 for dung, leaf, and maize leachates, respectively, in the light flumes and 37, 80, and 170 µg DOC L−1 h−1 in the dark flumes. DOC uptake correlated strongly with initial SRP (soluble reactive phosphorus) and DOC concentrations, but barely with DOM components and indices. Algae mostly stimulated the microbial DOC uptake, but the effects differed among differently aged biofilms. We developed a conceptual model of intrinsic (DOM quality) and external (environmental) controlling factors on DOM degradation, with the microbial community acting as biotic filter. View Full-Text
Keywords: dissolved organic carbon; uptake; fluorescence; absorbance; phosphorus; biofilm; extra-cellular enzyme activity dissolved organic carbon; uptake; fluorescence; absorbance; phosphorus; biofilm; extra-cellular enzyme activity
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MDPI and ACS Style

Weigelhofer, G.; Jirón, T.S.; Yeh, T.-C.; Steniczka, G.; Pucher, M. Dissolved Organic Matter Quality and Biofilm Composition Affect Microbial Organic Matter Uptake in Stream Flumes. Water 2020, 12, 3246. https://doi.org/10.3390/w12113246

AMA Style

Weigelhofer G, Jirón TS, Yeh T-C, Steniczka G, Pucher M. Dissolved Organic Matter Quality and Biofilm Composition Affect Microbial Organic Matter Uptake in Stream Flumes. Water. 2020; 12(11):3246. https://doi.org/10.3390/w12113246

Chicago/Turabian Style

Weigelhofer, Gabriele; Jirón, Tania S.; Yeh, Tz-Ching; Steniczka, Gertraud; Pucher, Matthias. 2020. "Dissolved Organic Matter Quality and Biofilm Composition Affect Microbial Organic Matter Uptake in Stream Flumes" Water 12, no. 11: 3246. https://doi.org/10.3390/w12113246

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