Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols
Dissolved organic carbon (DOC) plays critical roles in marine carbon cycling, but its sources and sinks remain uncertain. In this study, we monitored DOC exudation rates of Sargassum natans under visible light (lambda > 390 nm) and solar radiation. DOC release rates ranged from 7 to 10 mu g C g(b...
Published in: | Global Biogeochemical Cycles |
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Language: | English |
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AGU (American Geophysical Union)
2019
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Online Access: | https://oceanrep.geomar.de/id/eprint/48435/ https://oceanrep.geomar.de/id/eprint/48435/2/gbc20917-sup-0001-2019gb006225-si.docx https://oceanrep.geomar.de/id/eprint/48435/9/Powers_et_al-2019-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2019GB006225 |
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ftoceanrep:oai:oceanrep.geomar.de:48435 2023-05-15T17:35:00+02:00 Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols Powers, Leanne C. Hertkorn, Norbert McDonald, Natasha Schmitt‐Kopplin, Philippe Del Vecchio, Rossana Blough, Neil V. Gonsior, Michael 2019-11 text https://oceanrep.geomar.de/id/eprint/48435/ https://oceanrep.geomar.de/id/eprint/48435/2/gbc20917-sup-0001-2019gb006225-si.docx https://oceanrep.geomar.de/id/eprint/48435/9/Powers_et_al-2019-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2019GB006225 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/48435/2/gbc20917-sup-0001-2019gb006225-si.docx https://oceanrep.geomar.de/id/eprint/48435/9/Powers_et_al-2019-Global_Biogeochemical_Cycles.pdf Powers, L. C. , Hertkorn, N., McDonald, N., Schmitt‐Kopplin, P., Del Vecchio, R., Blough, N. V. and Gonsior, M. (2019) Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols . Open Access Global Biogeochemical Cycles, 33 (11). pp. 1423-1439. DOI 10.1029/2019GB006225 <https://doi.org/10.1029/2019GB006225>. doi:10.1029/2019GB006225 info:eu-repo/semantics/openAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1029/2019GB006225 2023-04-07T15:48:25Z Dissolved organic carbon (DOC) plays critical roles in marine carbon cycling, but its sources and sinks remain uncertain. In this study, we monitored DOC exudation rates of Sargassum natans under visible light (lambda > 390 nm) and solar radiation. DOC release rates ranged from 7 to 10 mu g C g(biomass)(-1) hr(-1) (wet weight) under visible light, but increased to 23 to 41 mu g C g(biomass)(-1) hr(-1) when exposed to natural sunlight. Results indicate that DOC released by Sargassum could amount to 0.3 to 1.2 Tg C/year, potentially contributing significantly to the marine DOC pool in the Gulf of Mexico and Western North Atlantic. We employed the Folin-Ciocalteu phenolic content method, nuclear magnetic resonance (NMR) spectroscopy, and ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to characterize the diverse pool of organic compounds exuded from Sargassum. Results from these complementary methods showed that Sargassum release large quantities of phlorotannins, a class of polyphenols that have very similar properties to terrestrial DOC. These phlorotannins and their oxygenated phenolic derivatives exhibit a high hydrogen deficiency and functionalization (i.e., 4 to 6 oxygen atoms per aromatic ring), representing 5 to 18% of the released DOC isolated by solid phase extraction. Thus, Sargassum is the largest biological source of open ocean polyphenols recorded to date. The amount of polyphenolic DOC released by Sargassum challenges previous beliefs that all polyphenols found within the oceans are remnants of terrestrial organic matter, although the stability of phlorotannins and their derivatives needs to be further evaluated. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) Global Biogeochemical Cycles 33 11 1423 1439 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Dissolved organic carbon (DOC) plays critical roles in marine carbon cycling, but its sources and sinks remain uncertain. In this study, we monitored DOC exudation rates of Sargassum natans under visible light (lambda > 390 nm) and solar radiation. DOC release rates ranged from 7 to 10 mu g C g(biomass)(-1) hr(-1) (wet weight) under visible light, but increased to 23 to 41 mu g C g(biomass)(-1) hr(-1) when exposed to natural sunlight. Results indicate that DOC released by Sargassum could amount to 0.3 to 1.2 Tg C/year, potentially contributing significantly to the marine DOC pool in the Gulf of Mexico and Western North Atlantic. We employed the Folin-Ciocalteu phenolic content method, nuclear magnetic resonance (NMR) spectroscopy, and ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to characterize the diverse pool of organic compounds exuded from Sargassum. Results from these complementary methods showed that Sargassum release large quantities of phlorotannins, a class of polyphenols that have very similar properties to terrestrial DOC. These phlorotannins and their oxygenated phenolic derivatives exhibit a high hydrogen deficiency and functionalization (i.e., 4 to 6 oxygen atoms per aromatic ring), representing 5 to 18% of the released DOC isolated by solid phase extraction. Thus, Sargassum is the largest biological source of open ocean polyphenols recorded to date. The amount of polyphenolic DOC released by Sargassum challenges previous beliefs that all polyphenols found within the oceans are remnants of terrestrial organic matter, although the stability of phlorotannins and their derivatives needs to be further evaluated. |
format |
Article in Journal/Newspaper |
author |
Powers, Leanne C. Hertkorn, Norbert McDonald, Natasha Schmitt‐Kopplin, Philippe Del Vecchio, Rossana Blough, Neil V. Gonsior, Michael |
spellingShingle |
Powers, Leanne C. Hertkorn, Norbert McDonald, Natasha Schmitt‐Kopplin, Philippe Del Vecchio, Rossana Blough, Neil V. Gonsior, Michael Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols |
author_facet |
Powers, Leanne C. Hertkorn, Norbert McDonald, Natasha Schmitt‐Kopplin, Philippe Del Vecchio, Rossana Blough, Neil V. Gonsior, Michael |
author_sort |
Powers, Leanne C. |
title |
Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols |
title_short |
Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols |
title_full |
Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols |
title_fullStr |
Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols |
title_full_unstemmed |
Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols |
title_sort |
sargassum sp. act as a large regional source of marine dissolved organic carbon and polyphenols |
publisher |
AGU (American Geophysical Union) |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/48435/ https://oceanrep.geomar.de/id/eprint/48435/2/gbc20917-sup-0001-2019gb006225-si.docx https://oceanrep.geomar.de/id/eprint/48435/9/Powers_et_al-2019-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2019GB006225 |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Lambda |
geographic_facet |
Lambda |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/48435/2/gbc20917-sup-0001-2019gb006225-si.docx https://oceanrep.geomar.de/id/eprint/48435/9/Powers_et_al-2019-Global_Biogeochemical_Cycles.pdf Powers, L. C. , Hertkorn, N., McDonald, N., Schmitt‐Kopplin, P., Del Vecchio, R., Blough, N. V. and Gonsior, M. (2019) Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols . Open Access Global Biogeochemical Cycles, 33 (11). pp. 1423-1439. DOI 10.1029/2019GB006225 <https://doi.org/10.1029/2019GB006225>. doi:10.1029/2019GB006225 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2019GB006225 |
container_title |
Global Biogeochemical Cycles |
container_volume |
33 |
container_issue |
11 |
container_start_page |
1423 |
op_container_end_page |
1439 |
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1766134005690793984 |