Strong influence of baseline respiration in an oligotrophic coastal ecosystem
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...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:77574 2023-08-27T04:08:05+02:00 Strong influence of baseline respiration in an oligotrophic coastal ecosystem Vikström, Kevin Bartl, Ines Karlsson, Jan Wikner, Johan 2020-10-15 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/77574/ https://ueaeprints.uea.ac.uk/id/eprint/77574/1/Published_Version.pdf https://doi.org/10.3389/fmars.2020.572070 en eng https://ueaeprints.uea.ac.uk/id/eprint/77574/1/Published_Version.pdf 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 doi:10.3389/fmars.2020.572070 cc_by Article PeerReviewed 2020 ftuniveastangl https://doi.org/10.3389/fmars.2020.572070 2023-08-10T22:32:28Z 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. Article in Journal/Newspaper Arctic Phytoplankton University of East Anglia: UEA Digital Repository Arctic Frontiers in Marine Science 7 |
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Open Polar |
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University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Vikström, Kevin Bartl, Ines Karlsson, Jan Wikner, Johan |
spellingShingle |
Vikström, Kevin Bartl, Ines Karlsson, Jan Wikner, Johan Strong influence of baseline respiration in an oligotrophic coastal ecosystem |
author_facet |
Vikström, Kevin Bartl, Ines Karlsson, Jan Wikner, Johan |
author_sort |
Vikström, Kevin |
title |
Strong influence of baseline respiration in an oligotrophic coastal ecosystem |
title_short |
Strong influence of baseline respiration in an oligotrophic coastal ecosystem |
title_full |
Strong influence of baseline respiration in an oligotrophic coastal ecosystem |
title_fullStr |
Strong influence of baseline respiration in an oligotrophic coastal ecosystem |
title_full_unstemmed |
Strong influence of baseline respiration in an oligotrophic coastal ecosystem |
title_sort |
strong influence of baseline respiration in an oligotrophic coastal ecosystem |
publishDate |
2020 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/77574/ https://ueaeprints.uea.ac.uk/id/eprint/77574/1/Published_Version.pdf https://doi.org/10.3389/fmars.2020.572070 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Phytoplankton |
genre_facet |
Arctic Phytoplankton |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/77574/1/Published_Version.pdf 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 doi:10.3389/fmars.2020.572070 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.3389/fmars.2020.572070 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
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1775348781037912064 |