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Systematic microbial production of optically active dissolved organic matter in subarctic lake water
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. (Arcum)ORCID-id: 0000-0002-4949-9792
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2020 (Engelska)Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 65, nr 5Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The ecology and biogeochemistry of lakes in the subarctic region are particularly sensitive to changes in the abundance and optical properties of dissolved organic matter (DOM). External input of colored DOM to these lakes is an extensively researched topic, but little is known about potential reciprocal feedbacks between the optical properties of DOM and internal microbial processes in the water. We performed 28-day dark laboratory incubation trials on water from 101 subarctic tundra lakes in northern Sweden, measuring the microbial decay of DOM and the resulting dynamics in colored (CDOM) and fluorescent (FDOM) DOM components. While losses in dissolved oxygen during the incubations corresponded to a 20% decrease in mean DOM, conversely the mean CDOM and total FDOM increased by 22% and 30%, respectively. However, the patterns in microbial transformation of the DOM were not the same in all lakes. Notably, along the gradient of increasing ambient CDOM (water brownness), the lakes showed decreased microbial production of protein-like fluorescence, lowered DOM turnover rates and decreasing bacterial growth per unit of DOM. These trends indicate that browning of subarctic lakes systematically change the way that bacteria interact with the ambient DOM pool. Our study underscores that there is no unidirectional causal link between microbial processes and DOM optical properties, but rather reciprocal dependence between the two.

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Association for the Sciences of Limnology and Oceanography (ASLO) , 2020. Vol. 65, nr 5
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser Ekologi
Identifikatorer
URN: urn:nbn:se:umu:diva-165344DOI: 10.1002/lno.11362ISI: 000493864600001Scopus ID: 2-s2.0-85074762468OAI: oai:DiVA.org:umu-165344DiVA, id: diva2:1373028
Forskningsfinansiär
Vetenskapsrådet, 2016-0527Knut och Alice Wallenbergs Stiftelse, 2016.0083Forskningsrådet Formas, 239-2014-698Forskningsrådet Formas, 2017-00772Tillgänglig från: 2019-11-26 Skapad: 2019-11-26 Senast uppdaterad: 2023-03-24Bibliografiskt granskad

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Gudasz, CristianKarlsson, Jan

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Gudasz, CristianKarlsson, Jan
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Institutionen för ekologi, miljö och geovetenskap
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Limnology and Oceanography
Oceanografi, hydrologi och vattenresurserEkologi

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