Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones

Climate warming is accelerating erosion along permafrost-dominated Arctic coasts. This results in the additional supply of organic matter (OM) and nutrients into the coastal zone. In this study we investigate the impact of coastal erosion on the marine microbial community composition and growth rate...

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Published in:Frontiers in Earth Science
Main Authors: Bruhn, Anders Dalhoff, Stedmon, Colin A., Comte, Jérôme, Matsuoka, Atsushi, Speetjens, Niek Jesse, Tanski, George, Vonk, Jorien E., Sjöstedt, Johanna
Other Authors: Horizon 2020, Japan Aerospace Exploration Agency, Danmarks Frie Forskningsfond, Vetenskapsrådet, Natural Sciences and Engineering Research Council of Canada
Format: Article in Journal/Newspaper
Language:unknown
Published: Frontiers Media SA 2021
Subjects:
Online Access:http://dx.doi.org/10.3389/feart.2021.640580
https://www.frontiersin.org/articles/10.3389/feart.2021.640580/full
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spelling crfrontiers:10.3389/feart.2021.640580 2024-09-15T17:58:49+00:00 Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones Bruhn, Anders Dalhoff Stedmon, Colin A. Comte, Jérôme Matsuoka, Atsushi Speetjens, Niek Jesse Tanski, George Vonk, Jorien E. Sjöstedt, Johanna Horizon 2020 Japan Aerospace Exploration Agency Danmarks Frie Forskningsfond Vetenskapsrådet Natural Sciences and Engineering Research Council of Canada 2021 http://dx.doi.org/10.3389/feart.2021.640580 https://www.frontiersin.org/articles/10.3389/feart.2021.640580/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 9 ISSN 2296-6463 journal-article 2021 crfrontiers https://doi.org/10.3389/feart.2021.640580 2024-07-30T04:04:14Z Climate warming is accelerating erosion along permafrost-dominated Arctic coasts. This results in the additional supply of organic matter (OM) and nutrients into the coastal zone. In this study we investigate the impact of coastal erosion on the marine microbial community composition and growth rates in the coastal Beaufort Sea. Dissolved organic matter (DOM) derived from three representative glacial deposit types (fluvial, lacustrine, and moraine) along the Yukon coastal plain, Canada, were used as substrate to cultivate marine bacteria using a chemostat setup. Our results show that DOM composition (inferred from UV-Visible spectroscopy) and biodegradability (inferred from DOC concentration, bacterial production and respiration) significantly differ between the three glacial deposit types. DOM derived from fluvial and moraine types show clear terrestrial characteristics with low aromaticity ( S r : 0.63 ± 0.02 and SUVA 254 : 1.65 ± 0.06 L mg C −1 m −1 & S r : 0.68 ± 0.01 and SUVA 254 : 1.17 ± 0.06 L mg C −1 m −1 , respectively) compared to the lacustrine soil type ( S r : 0.71 ± 0.02 and SUVA 254 : 2.15 ± 0.05 L mg C −1 m −1 ). The difference in composition of DOM leads to the development of three different microbial communities. Whereas Alphaproteobacteria dominate in fluvial and lacustrine deposit types (67 and 87% relative abundance, respectively), Gammaproteobacteria is the most abundant class for moraine deposit type (88% relative abundance). Bacterial growth efficiency (BGE) is 66% for DOM from moraine deposit type, while 13 and 28% for DOM from fluvial and lacustrine deposit types, respectively. The three microbial communities therefore differ strongly in their net effect on DOM utilization depending on the eroded landscape type. The high BGE value for moraine-derived DOM is probably caused by a larger proportion of labile colorless DOM. These results indicate that the substrate controls marine microbial community composition and activities in coastal waters. This suggests that biogeochemical ... Article in Journal/Newspaper Beaufort Sea permafrost Yukon Frontiers (Publisher) Frontiers in Earth Science 9
institution Open Polar
collection Frontiers (Publisher)
op_collection_id crfrontiers
language unknown
description Climate warming is accelerating erosion along permafrost-dominated Arctic coasts. This results in the additional supply of organic matter (OM) and nutrients into the coastal zone. In this study we investigate the impact of coastal erosion on the marine microbial community composition and growth rates in the coastal Beaufort Sea. Dissolved organic matter (DOM) derived from three representative glacial deposit types (fluvial, lacustrine, and moraine) along the Yukon coastal plain, Canada, were used as substrate to cultivate marine bacteria using a chemostat setup. Our results show that DOM composition (inferred from UV-Visible spectroscopy) and biodegradability (inferred from DOC concentration, bacterial production and respiration) significantly differ between the three glacial deposit types. DOM derived from fluvial and moraine types show clear terrestrial characteristics with low aromaticity ( S r : 0.63 ± 0.02 and SUVA 254 : 1.65 ± 0.06 L mg C −1 m −1 & S r : 0.68 ± 0.01 and SUVA 254 : 1.17 ± 0.06 L mg C −1 m −1 , respectively) compared to the lacustrine soil type ( S r : 0.71 ± 0.02 and SUVA 254 : 2.15 ± 0.05 L mg C −1 m −1 ). The difference in composition of DOM leads to the development of three different microbial communities. Whereas Alphaproteobacteria dominate in fluvial and lacustrine deposit types (67 and 87% relative abundance, respectively), Gammaproteobacteria is the most abundant class for moraine deposit type (88% relative abundance). Bacterial growth efficiency (BGE) is 66% for DOM from moraine deposit type, while 13 and 28% for DOM from fluvial and lacustrine deposit types, respectively. The three microbial communities therefore differ strongly in their net effect on DOM utilization depending on the eroded landscape type. The high BGE value for moraine-derived DOM is probably caused by a larger proportion of labile colorless DOM. These results indicate that the substrate controls marine microbial community composition and activities in coastal waters. This suggests that biogeochemical ...
author2 Horizon 2020
Japan Aerospace Exploration Agency
Danmarks Frie Forskningsfond
Vetenskapsrådet
Natural Sciences and Engineering Research Council of Canada
format Article in Journal/Newspaper
author Bruhn, Anders Dalhoff
Stedmon, Colin A.
Comte, Jérôme
Matsuoka, Atsushi
Speetjens, Niek Jesse
Tanski, George
Vonk, Jorien E.
Sjöstedt, Johanna
spellingShingle Bruhn, Anders Dalhoff
Stedmon, Colin A.
Comte, Jérôme
Matsuoka, Atsushi
Speetjens, Niek Jesse
Tanski, George
Vonk, Jorien E.
Sjöstedt, Johanna
Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones
author_facet Bruhn, Anders Dalhoff
Stedmon, Colin A.
Comte, Jérôme
Matsuoka, Atsushi
Speetjens, Niek Jesse
Tanski, George
Vonk, Jorien E.
Sjöstedt, Johanna
author_sort Bruhn, Anders Dalhoff
title Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones
title_short Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones
title_full Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones
title_fullStr Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones
title_full_unstemmed Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones
title_sort terrestrial dissolved organic matter mobilized from eroding permafrost controls microbial community composition and growth in arctic coastal zones
publisher Frontiers Media SA
publishDate 2021
url http://dx.doi.org/10.3389/feart.2021.640580
https://www.frontiersin.org/articles/10.3389/feart.2021.640580/full
genre Beaufort Sea
permafrost
Yukon
genre_facet Beaufort Sea
permafrost
Yukon
op_source Frontiers in Earth Science
volume 9
ISSN 2296-6463
op_rights https://creativecommons.org/licenses/by/4.0/
op_doi https://doi.org/10.3389/feart.2021.640580
container_title Frontiers in Earth Science
container_volume 9
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