Strong influence of baseline respiration in an oligotrophic coastal ecosystem

Vikström, Kevin, Bartl, Ines, Karlsson, Jan and Wikner, Johan (2020) Strong influence of baseline respiration in an oligotrophic coastal ecosystem. Frontiers in Marine Science, 7. ISSN 2296-7745

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Respiration is a key metabolic process in the marine environment and contemporary phytoplankton production (PhP) is commonly assumed the main driver. However, respiration in the absence of contemporary PhP, termed baseline respiration, can influence the energetics of an ecosystem and its sensitivity to hypoxia. Direct studies of baseline respiration are currently lacking. This study aims to obtain a first estimate of baseline respiration in a sub-arctic estuary and determine its contribution to plankton community respiration. Three approaches used to define baseline respiration determined the average rate to be 4.1 ± 0.1 (SE) mmol O2 m–3 d–1. A hypsographic model at the basin scale accounting for seasonal variation estimated an annual contribution of 30% baseline respiration to planktonic respiration. There was no correlation between plankton respiration and PhP, but a significant linear dependence was found with the total carbon supply from phytoplankton and riverine input. The sum of dissolved organic carbon transported by rivers, provided by both benthic and pelagic algae, could sustain 69% of the annual plankton respiration, of which as much as 25% occurred during winter. However, only 32% of the winter season respiration was explained, indicating that unknown carbon sources exist during the winter. Nitrification had a negligible (≤2.4%) effect on baseline respiration in the system. The results show that baseline respiration accounted for a significant percentage of coastal plankton respiration when allochthonous sources dominated the carbon supply, weakening the respiration-to- PhP relationship.

Item Type: Article
Uncontrolled Keywords: allochthonous carbon,baseline respiration,estuary,nitrification,oligotrophic,phytoplankton production,planktonic,respiration,oceanography,global and planetary change,aquatic science,water science and technology,environmental science (miscellaneous),ocean engineering,sdg 14 - life below water ,/dk/atira/pure/subjectarea/asjc/1900/1910
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 07 Nov 2020 01:09
Last Modified: 04 Aug 2023 10:31
DOI: 10.3389/fmars.2020.572070


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