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Comprehensive analysis of chemical and biological problems associated with browning agents used in aquatic studies
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. University of Potsdam.ORCID iD: 0000-0003-2858-5947
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab. Swedish University of Agricultural Sciences, Uppsala.ORCID iD: 0000-0003-3892-8157
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. WasserCluster Lunz.ORCID iD: 0000-0002-6503-9497
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Swedish University of Agricultural Sciences, Uppsala.ORCID iD: 0000-0002-4265-1835
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2021 (English)In: Limnology and Oceanography: Methods, E-ISSN 1541-5856, Vol. 19, no 12, p. 818-835Article in journal (Refereed) Published
Abstract [en]

Inland waters receive and process large amounts of colored organic matter from the terrestrial surroundings. These inputs dramatically affect the chemical, physical, and biological properties of water bodies, as well as their roles as global carbon sinks and sources. However, manipulative studies, especially at ecosystem scale, require large amounts of dissolved organic matter with optical and chemical properties resembling indigenous organic matter. Here, we compared the impacts of two leonardite products (HuminFeed and SuperHume) and a freshly derived reverse osmosis concentrate of organic matter in a set of comprehensive mesocosm- and laboratory-scale experiments and analyses. The chemical properties of the reverse osmosis concentrate and the leonardite products were very different, with leonardite products being low and the reverse osmosis concentrate being high in carboxylic functional groups. Light had a strong impact on the properties of leonardite products, including loss of color and increased particle formation. HuminFeed presented a substantial impact on microbial communities under light conditions, where bacterial production was stimulated and community composition modified, while in dark potential inhibition of bacterial processes was detected. While none of the browning agents inhibited the growth of the tested phytoplankton Gonyostomum semen, HuminFeed had detrimental effects on zooplankton abundance and Daphnia reproduction. We conclude that the effects of browning agents extracted from leonardite, particularly HuminFeed, are in sharp contrast to those originating from terrestrially derived dissolved organic matter. Hence, they should be used with great caution in experimental studies on the consequences of terrestrial carbon for aquatic systems.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 19, no 12, p. 818-835
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-461034DOI: 10.1002/lom3.10463ISI: 000711887000001OAI: oai:DiVA.org:uu-461034DiVA, id: diva2:1618904
Funder
Knut and Alice Wallenberg Foundation, KAW 2013.0091Swedish Research Council FormasEU, FP7, Seventh Framework ProgrammeAvailable from: 2021-12-10 Created: 2021-12-10 Last updated: 2024-01-15Bibliographically approved

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Scharnweber, KristinPeura, SariAttermeyer, KatrinBertilsson, StefanBuck, MoritzEinarsdóttir, KarólinaGarcia, Sarahi L.Grasset, CharlotteGroeneveld, MarloesHawkes, Jeffrey A.Lindström, Eva S.Manthey, ChristinÖvergaard, RobynSedano-Núñez, Vicente T.Tranvik, Lars J.Székely, Anna J.

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Scharnweber, KristinPeura, SariAttermeyer, KatrinBertilsson, StefanBuck, MoritzEinarsdóttir, KarólinaGarcia, Sarahi L.Grasset, CharlotteGroeneveld, MarloesHawkes, Jeffrey A.Lindström, Eva S.Manthey, ChristinÖvergaard, RobynSedano-Núñez, Vicente T.Tranvik, Lars J.Székely, Anna J.
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LimnologyScience for Life Laboratory, SciLifeLabAnalytical ChemistryMolecular Evolution
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Limnology and Oceanography: Methods
Ecology

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