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...
Published in: | Frontiers in Earth Science |
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Language: | English |
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2021
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Online Access: | https://orbit.dtu.dk/en/publications/b1ba926b-2315-4220-8c18-57f767119f81 https://doi.org/10.3389/feart.2021.640580 https://backend.orbit.dtu.dk/ws/files/245803897/feart_09_640580.pdf https://doi.org/10.11583/DTU.14113250.v1 |
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ftdtupubl:oai:pure.atira.dk:publications/b1ba926b-2315-4220-8c18-57f767119f81 2024-06-23T07:48:38+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, Jerome Matsuoka, Atsushi Speetjens, Niek Jesse Tanski, George Vonk, Jorien E. Sjostedt, Johanna 2021 application/pdf https://orbit.dtu.dk/en/publications/b1ba926b-2315-4220-8c18-57f767119f81 https://doi.org/10.3389/feart.2021.640580 https://backend.orbit.dtu.dk/ws/files/245803897/feart_09_640580.pdf https://doi.org/10.11583/DTU.14113250.v1 eng eng https://orbit.dtu.dk/en/publications/b1ba926b-2315-4220-8c18-57f767119f81 info:eu-repo/semantics/openAccess Bruhn , A D , Stedmon , C A , Comte , J , Matsuoka , A , Speetjens , N J , Tanski , G , Vonk , J E & Sjostedt , J 2021 , ' Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones ' , Frontiers in Earth Science , vol. 9 , 640580 . https://doi.org/10.3389/feart.2021.640580 Climate change Terrestial dissolved organic matter Arctic coastal zone Marine microbial community Chemostat Glacial deposits Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2021 ftdtupubl https://doi.org/10.3389/feart.2021.64058010.11583/DTU.14113250.v1 2024-06-11T15:02:08Z 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 changes ... Article in Journal/Newspaper Arctic Arctic Beaufort Sea Climate change permafrost Yukon Technical University of Denmark: DTU Orbit Arctic Canada Yukon Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Climate change Terrestial dissolved organic matter Arctic coastal zone Marine microbial community Chemostat Glacial deposits Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Climate change Terrestial dissolved organic matter Arctic coastal zone Marine microbial community Chemostat Glacial deposits Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Bruhn, Anders Dalhoff Stedmon, Colin A. Comte, Jerome Matsuoka, Atsushi Speetjens, Niek Jesse Tanski, George Vonk, Jorien E. Sjostedt, Johanna Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones |
topic_facet |
Climate change Terrestial dissolved organic matter Arctic coastal zone Marine microbial community Chemostat Glacial deposits Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
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 changes ... |
format |
Article in Journal/Newspaper |
author |
Bruhn, Anders Dalhoff Stedmon, Colin A. Comte, Jerome Matsuoka, Atsushi Speetjens, Niek Jesse Tanski, George Vonk, Jorien E. Sjostedt, Johanna |
author_facet |
Bruhn, Anders Dalhoff Stedmon, Colin A. Comte, Jerome Matsuoka, Atsushi Speetjens, Niek Jesse Tanski, George Vonk, Jorien E. Sjostedt, 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 |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/b1ba926b-2315-4220-8c18-57f767119f81 https://doi.org/10.3389/feart.2021.640580 https://backend.orbit.dtu.dk/ws/files/245803897/feart_09_640580.pdf https://doi.org/10.11583/DTU.14113250.v1 |
geographic |
Arctic Canada Yukon |
geographic_facet |
Arctic Canada Yukon |
genre |
Arctic Arctic Beaufort Sea Climate change permafrost Yukon |
genre_facet |
Arctic Arctic Beaufort Sea Climate change permafrost Yukon |
op_source |
Bruhn , A D , Stedmon , C A , Comte , J , Matsuoka , A , Speetjens , N J , Tanski , G , Vonk , J E & Sjostedt , J 2021 , ' Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones ' , Frontiers in Earth Science , vol. 9 , 640580 . https://doi.org/10.3389/feart.2021.640580 |
op_relation |
https://orbit.dtu.dk/en/publications/b1ba926b-2315-4220-8c18-57f767119f81 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/feart.2021.64058010.11583/DTU.14113250.v1 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1802638976245301248 |