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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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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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 |
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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 |
_version_ |
1810435795812614144 |