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Potential terrestrial influence on transparent exopolymer particle (TEP) concentrations in boreal freshwaters
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0002-6503-9497
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Catalan Institute for Water Research (ICRA), Girona, Spain.ORCID iD: 0000-0002-2433-4190
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0001-9842-0158
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2019 (English)In: Journal of limnology, ISSN 1129-5767, E-ISSN 1723-8633Article in journal (Refereed) Epub ahead of print
Abstract [en]

Transparent exopolymer particles (TEP) are ubiquitous in aquatic ecosystems and contribute, for example, to sedimentation of organic matter in oceans and freshwaters. Earlier studies indicate that the formation of TEP is related to the in situ activity of phytoplankton or bacteria. However, terrestrial sources of TEP and TEP precursors are usually not considered. We investigated TEP concentration and its driving factors in boreal freshwaters, hypoth- esizing that TEP and TEP precursors can enter freshwaters via terrestrial inputs. In a field survey, we measured TEP concentrations and other environmental factors across 30 aquatic ecosystems in Sweden. In a mesocosm experi- ment, we further investigated TEP dynamics over time after manipulating terrestrial organic matter input and light conditions. The TEP concentrations in boreal freshwaters ranged from 83 to 4940 μg Gum Xanthan equivalent L−1, which is comparable to other studies in freshwaters. The carbon fraction in TEP in the sampled boreal freshwaters is much higher than the phytoplanktonic carbon, in contrast to previous studies in northern temperate and Medi- terranean regions. Boreal TEP concentrations were mostly related to particulate organic carbon, dissolved organic carbon, and optical indices of terrestrial influence but less influenced by bacterial abundance, bacterial production, and chlorophyll a. Hence, our results do not support a major role of the phytoplankton community or aquatic bac- teria on TEP concentrations and dynamics. This suggests a strong external control of TEP concentrations in boreal freshwaters, which can in turn affect particle dynamics and sedimentation in the recipient aquatic ecosystem.

Place, publisher, year, edition, pages
2019.
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Oceanography, Hydrology and Water Resources
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URN: urn:nbn:se:uu:diva-384035DOI: 10.1002/lno.11197OAI: oai:DiVA.org:uu-384035DiVA, id: diva2:1320228
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Swedish Research Council, 2014-04264Knut and Alice Wallenberg Foundation, KAW 2013.0091German Research Foundation (DFG), AT 185/1-1Available from: 2019-06-04 Created: 2019-06-04 Last updated: 2019-06-10Bibliographically approved

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Attermeyer, KatrinAndersson, SaraCatalán, NúriaEinarsdóttir, KarólinaGroeneveld, Marloes M.Szekely, Anna J.Tranvik, Lars
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