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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Frontiers Media S. A.
2021
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Online Access: | https://lup.lub.lu.se/record/94f90dac-da6c-49f3-a5a8-655dbe624cd6 https://doi.org/10.3389/feart.2021.640580 |
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ftulundlup:oai:lup.lub.lu.se:94f90dac-da6c-49f3-a5a8-655dbe624cd6 2023-05-15T14:53:00+02:00 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 2021 https://lup.lub.lu.se/record/94f90dac-da6c-49f3-a5a8-655dbe624cd6 https://doi.org/10.3389/feart.2021.640580 eng eng Frontiers Media S. A. https://lup.lub.lu.se/record/94f90dac-da6c-49f3-a5a8-655dbe624cd6 http://dx.doi.org/10.3389/feart.2021.640580 scopus:85104184183 Frontiers in Earth Science; 9, no 640580 (2021) ISSN: 2296-6463 Microbiology Arctic coastal zone chemostat climate change glacial deposits marine microbial community permafrost terrestrial dissolved organic matter contributiontojournal/article info:eu-repo/semantics/article text 2021 ftulundlup https://doi.org/10.3389/feart.2021.640580 2023-02-01T23:39:10Z 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 (Sr: 0.63 ± 0.02 and SUVA254: 1.65 ± 0.06 L mg C−1 m−1 & Sr: 0.68 ± 0.01 and SUVA254: 1.17 ± 0.06 L mg C−1 m−1, respectively) compared to the lacustrine soil type (Sr: 0.71 ± 0.02 and SUVA254: 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 in the Arctic coastal ... Article in Journal/Newspaper Arctic Beaufort Sea Climate change permafrost Yukon Lund University Publications (LUP) Arctic Yukon Canada Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Microbiology Arctic coastal zone chemostat climate change glacial deposits marine microbial community permafrost terrestrial dissolved organic matter |
spellingShingle |
Microbiology Arctic coastal zone chemostat climate change glacial deposits marine microbial community permafrost terrestrial dissolved organic matter 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 |
topic_facet |
Microbiology Arctic coastal zone chemostat climate change glacial deposits marine microbial community permafrost terrestrial dissolved organic matter |
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 (Sr: 0.63 ± 0.02 and SUVA254: 1.65 ± 0.06 L mg C−1 m−1 & Sr: 0.68 ± 0.01 and SUVA254: 1.17 ± 0.06 L mg C−1 m−1, respectively) compared to the lacustrine soil type (Sr: 0.71 ± 0.02 and SUVA254: 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 in the Arctic coastal ... |
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 |
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 S. A. |
publishDate |
2021 |
url |
https://lup.lub.lu.se/record/94f90dac-da6c-49f3-a5a8-655dbe624cd6 https://doi.org/10.3389/feart.2021.640580 |
geographic |
Arctic Yukon Canada |
geographic_facet |
Arctic Yukon Canada |
genre |
Arctic Beaufort Sea Climate change permafrost Yukon |
genre_facet |
Arctic Beaufort Sea Climate change permafrost Yukon |
op_source |
Frontiers in Earth Science; 9, no 640580 (2021) ISSN: 2296-6463 |
op_relation |
https://lup.lub.lu.se/record/94f90dac-da6c-49f3-a5a8-655dbe624cd6 http://dx.doi.org/10.3389/feart.2021.640580 scopus:85104184183 |
op_doi |
https://doi.org/10.3389/feart.2021.640580 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1766324419406331904 |