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Stream metabolism controls diel patterns and evasion of CO2 in Arctic streams
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.ORCID iD: 0000-0001-7853-2531
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.ORCID iD: 0000-0002-5758-2705
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.ORCID iD: 0000-0001-5102-4289
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
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2019 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486Article in journal (Refereed) Epub ahead of print
Abstract [en]

Streams play an important role in the global carbon (C) cycle, accounting for a large portion of CO2 evaded from inland waters despite their small areal coverage. However, the relative importance of different terrestrial and aquatic processes driving CO2 production and evasion from streams remains poorly understood. In this study, we measured O-2 and CO2 continuously in streams draining tundra-dominated catchments in northern Sweden, during the summers of 2015 and 2016. From this, we estimated daily metabolic rates and CO2 evasion simultaneously and thus provide insight into the role of stream metabolism as a driver of C dynamics in Arctic streams. Our results show that aquatic biological processes regulate CO2 concentrations and evasion at multiple timescales. Photosynthesis caused CO2 concentrations to decrease by as much as 900 ppm during the day, with the magnitude of this diel variation being strongest at the low-turbulence streams. Diel patterns in CO2 concentrations in turn influenced evasion, with up to 45% higher rates at night. Throughout the summer, CO2 evasion was sustained by aquatic ecosystem respiration, which was one order of magnitude higher than gross primary production. Furthermore, in most cases, the contribution of stream respiration exceeded CO2 evasion, suggesting that some stream reaches serve as net sources of CO2, thus creating longitudinal heterogeneity in C production and loss within this stream network. Overall, our results provide the first link between stream metabolism and CO2 evasion in the Arctic and demonstrate that stream metabolic processes are key drivers of the transformation and fate of terrestrial organic matter exported from these landscapes.

Place, publisher, year, edition, pages
John Wiley & Sons , 2019.
Keywords [en]
Arctic, carbon cycle, carbon processing, CO2 evasion, stream metabolism
National Category
Ecology Geosciences, Multidisciplinary
Research subject
Limnology
Identifiers
URN: urn:nbn:se:polar:diva-8387DOI: 10.1111/gcb.14895ISI: 000499301300001PubMedID: 31667979OAI: oai:DiVA.org:polar-8387DiVA, id: diva2:1396012
Note

Originally included in thesis in manuscript form.

Available from: 2020-02-25 Created: 2020-02-25 Last updated: 2020-02-25Bibliographically approved

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Rocher-Ros, GerardSponseller, Ryan A.Bergström, Ann-KristinMyrstener, MariaGiesler, Reiner
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