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      Bacterial community composition and function along spatiotemporal connectivity gradients in the Danube floodplain (Vienna, Austria)

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          Abstract

          It is well recognized that river-floodplain systems contribute significantly to riverine ecosystem metabolism, and that bacteria are key players in the aquatic organic carbon cycle, but surprisingly few studies have linked bacterial community composition (BCC), function and carbon quality in these hydrologically highly dynamic habitats. We investigated aquatic BCC and extracellular enzymatic activity (EEA) related to dissolved organic carbon quality and algae composition, including the impact of a major flood event in one of the last remaining European semi-natural floodplain-systems. We found that surface connectivity of floodplain pools homogenizes BCC and EEA, whereas low connectivity led to increased BCC and EEA heterogeneity, supported by their relationship to electrical conductivity, an excellent indicator for surface connection strength. Hydrogeochemical parameters best explained variation of both BCC and EEA, while the algal community and chromophoric DOM properties explained only minor fractions of BCC variation. We conclude that intermittent surface connectivity and especially permanent isolation of floodplain pools from the main river channel may severely alter BCC and EEA, with potential consequences for nutrient cycling, ecological services and greenhouse gas emissions. Disentangling microbial structure–function coupling is therefore crucial, if we are to understand and predict the consequences of human alterations on these dynamic systems.

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          The online version of this article (10.1007/s00027-020-0700-x) contains supplementary material, which is available to authorized users.

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          Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon.

          Specific UV absorbance (SUVA) is defined as the UV absorbance of a water sample at a given wavelength normalized for dissolved organic carbon (DOC) concentration. Our data indicate that SUVA, determined at 254 nm, is strongly correlated with percent aromaticity as determined by 13C NMR for 13 organic matter isolates obtained from a variety of aquatic environments. SUVA, therefore, is shown to be a useful parameter for estimating the dissolved aromatic carbon content in aquatic systems. Experiments involving the reactivity of DOC with chlorine and tetramethylammonium hydroxide (TMAH), however, show a wide range of reactivity for samples with similar SUVA values. These results indicate that, while SUVA measurements are good predictors of general chemical characteristics of DOC, they do not provide information about reactivity of DOC derived from different types of source materials. Sample pH, nitrate, and iron were found to influence SUVA measurements.
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            Biophysical controls on organic carbon fluxes in fluvial networks

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              Spectrofluorometric characterization of dissolved organic matter for indication of precursor organic material and aromaticity

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                Author and article information

                Contributors
                anna.sieczko@liu.se
                Journal
                Aquat Sci
                Aquat Sci
                Aquatic Sciences
                Springer International Publishing (Cham )
                1015-1621
                1420-9055
                18 February 2020
                18 February 2020
                2020
                : 82
                : 2
                : 28
                Affiliations
                [1 ]ISNI 0000 0001 2286 1424, GRID grid.10420.37, Department of Limnology and Oceanography, , University of Vienna, ; Althanstrasse 14, 1090 Wien, Austria
                [2 ]WasserCluster Lunz, Dr. Carl Kupelwieser Promenade 5, 3293 Lunz Am See, Austria
                [3 ]ISNI 0000 0001 2162 9922, GRID grid.5640.7, Department of Thematic Studies–Environmental Change, , Linköping University, ; Tema M, Campus Valla, 581 83 Linköping, Sweden
                Article
                700
                10.1007/s00027-020-0700-x
                7045780
                125c5f28-e1e9-4408-9e40-04eb5d64585c
                © The Author(s) 2020

                Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 8 February 2019
                : 2 January 2020
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100002428, Austrian Science Fund;
                Award ID: P24604
                Award Recipient :
                Categories
                Research Article
                Custom metadata
                © Springer Nature Switzerland AG 2020

                flooding,hydrology,dissolved organic matter,freshwater bacterial diversity,ecosystem processes

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