DOM degradation by light and microbes along the Yukon River-coastal ocean continuum
The Arctic is experiencing rapid warming, resulting in fundamental shifts in hydrologic connectivity and carbon cycling. Dissolved organic matter (DOM) is a significant component of the Arctic and global carbon cycle, and significant perturbations to DOM cycling are expected with Arctic warming. The...
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ftpubmed:oai:pubmedcentral.nih.gov:8119953 2023-05-15T14:48:19+02:00 DOM degradation by light and microbes along the Yukon River-coastal ocean continuum Grunert, Brice K. Tzortziou, Maria Neale, Patrick Menendez, Alana Hernes, Peter 2021-05-13 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8119953/ http://www.ncbi.nlm.nih.gov/pubmed/33986333 https://doi.org/10.1038/s41598-021-89327-9 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8119953/ http://www.ncbi.nlm.nih.gov/pubmed/33986333 http://dx.doi.org/10.1038/s41598-021-89327-9 © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Sci Rep Article Text 2021 ftpubmed https://doi.org/10.1038/s41598-021-89327-9 2021-05-23T00:32:13Z The Arctic is experiencing rapid warming, resulting in fundamental shifts in hydrologic connectivity and carbon cycling. Dissolved organic matter (DOM) is a significant component of the Arctic and global carbon cycle, and significant perturbations to DOM cycling are expected with Arctic warming. The impact of photochemical and microbial degradation, and their interactive effects, on DOM composition and remineralization have been documented in Arctic soils and rivers. However, the role of microbes, sunlight and their interactions on Arctic DOM alteration and remineralization in the coastal ocean has not been considered, particularly during the spring freshet when DOM loads are high, photoexposure can be quite limited and residence time within river networks is low. Here, we collected DOM samples along a salinity gradient in the Yukon River delta, plume and coastal ocean during peak river discharge immediately after spring freshet and explored the role of UV exposure, microbial transformations and interactive effects on DOM quantity and composition. Our results show: (1) photochemical alteration of DOM significantly shifts processing pathways of terrestrial DOM, including increasing relative humification of DOM by microbes by > 10%; (2) microbes produce humic-like material that is not optically distinguishable from terrestrial humics; and (3) size-fractionation of the microbial community indicates a size-dependent role for DOM remineralization and humification of DOM observed through modeled PARAFAC components of fluorescent DOM, either through direct or community effects. Field observations indicate apparent conservative mixing along the salinity gradient; however, changing photochemical and microbial alteration of DOM with increasing salinity indicate changing DOM composition likely due to microbial activity. Finally, our findings show potential for rapid transformation of DOM in the coastal ocean from photochemical and microbial alteration, with microbes responsible for the majority of dissolved organic ... Text Arctic Yukon river Yukon PubMed Central (PMC) Arctic Yukon Scientific Reports 11 1 |
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Article Grunert, Brice K. Tzortziou, Maria Neale, Patrick Menendez, Alana Hernes, Peter DOM degradation by light and microbes along the Yukon River-coastal ocean continuum |
topic_facet |
Article |
description |
The Arctic is experiencing rapid warming, resulting in fundamental shifts in hydrologic connectivity and carbon cycling. Dissolved organic matter (DOM) is a significant component of the Arctic and global carbon cycle, and significant perturbations to DOM cycling are expected with Arctic warming. The impact of photochemical and microbial degradation, and their interactive effects, on DOM composition and remineralization have been documented in Arctic soils and rivers. However, the role of microbes, sunlight and their interactions on Arctic DOM alteration and remineralization in the coastal ocean has not been considered, particularly during the spring freshet when DOM loads are high, photoexposure can be quite limited and residence time within river networks is low. Here, we collected DOM samples along a salinity gradient in the Yukon River delta, plume and coastal ocean during peak river discharge immediately after spring freshet and explored the role of UV exposure, microbial transformations and interactive effects on DOM quantity and composition. Our results show: (1) photochemical alteration of DOM significantly shifts processing pathways of terrestrial DOM, including increasing relative humification of DOM by microbes by > 10%; (2) microbes produce humic-like material that is not optically distinguishable from terrestrial humics; and (3) size-fractionation of the microbial community indicates a size-dependent role for DOM remineralization and humification of DOM observed through modeled PARAFAC components of fluorescent DOM, either through direct or community effects. Field observations indicate apparent conservative mixing along the salinity gradient; however, changing photochemical and microbial alteration of DOM with increasing salinity indicate changing DOM composition likely due to microbial activity. Finally, our findings show potential for rapid transformation of DOM in the coastal ocean from photochemical and microbial alteration, with microbes responsible for the majority of dissolved organic ... |
format |
Text |
author |
Grunert, Brice K. Tzortziou, Maria Neale, Patrick Menendez, Alana Hernes, Peter |
author_facet |
Grunert, Brice K. Tzortziou, Maria Neale, Patrick Menendez, Alana Hernes, Peter |
author_sort |
Grunert, Brice K. |
title |
DOM degradation by light and microbes along the Yukon River-coastal ocean continuum |
title_short |
DOM degradation by light and microbes along the Yukon River-coastal ocean continuum |
title_full |
DOM degradation by light and microbes along the Yukon River-coastal ocean continuum |
title_fullStr |
DOM degradation by light and microbes along the Yukon River-coastal ocean continuum |
title_full_unstemmed |
DOM degradation by light and microbes along the Yukon River-coastal ocean continuum |
title_sort |
dom degradation by light and microbes along the yukon river-coastal ocean continuum |
publisher |
Nature Publishing Group UK |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8119953/ http://www.ncbi.nlm.nih.gov/pubmed/33986333 https://doi.org/10.1038/s41598-021-89327-9 |
geographic |
Arctic Yukon |
geographic_facet |
Arctic Yukon |
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Arctic Yukon river Yukon |
genre_facet |
Arctic Yukon river Yukon |
op_source |
Sci Rep |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8119953/ http://www.ncbi.nlm.nih.gov/pubmed/33986333 http://dx.doi.org/10.1038/s41598-021-89327-9 |
op_rights |
© The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
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https://doi.org/10.1038/s41598-021-89327-9 |
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Scientific Reports |
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