Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord
The warming of the Arctic causes increased riverine discharge, coastal erosion, and the thawing of permafrost. Together, this is leading to an increased wash out of terrestrial dissolved organic matter (tDOM) into the coastal Arctic ecosystems. This tDOM may be anticipated to affect both carbon and...
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ftunivbergen:oai:bora.uib.no:1956/18526 2023-05-15T14:24:07+02:00 Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord Müller, Oliver Seuthe, Lena Bratbak, Gunnar Paulsen, Maria Lund 2018-08-06 application/pdf https://hdl.handle.net/1956/18526 https://doi.org/10.3389/fmars.2018.00263 eng eng Frontiers Implications of a changing Arctic on microbial communities: Following the effects of thawing permafrost from land to sea urn:issn:2296-7745 https://hdl.handle.net/1956/18526 https://doi.org/10.3389/fmars.2018.00263 Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/ Copyright the Author(s) 263 Frontiers in Marine Science 5 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Peer reviewed Journal article 2018 ftunivbergen https://doi.org/10.3389/fmars.2018.00263 2023-03-14T17:43:46Z The warming of the Arctic causes increased riverine discharge, coastal erosion, and the thawing of permafrost. Together, this is leading to an increased wash out of terrestrial dissolved organic matter (tDOM) into the coastal Arctic ecosystems. This tDOM may be anticipated to affect both carbon and nutrient flow in the microbial food web and microbial community composition, but there are few studies detailing this in Arctic marine ecosystems. We tested the effects of tDOM on the bacterial community composition and net-growth by extracting DOM from the active layer of permafrost soil and adding the aged tDOM concentrate to a natural microbial fjord community (Kongsfjorden, NW Svalbard). This resulted in an increased carbon load of 128 μM DOC in the tDOM treatment relative to the control of 83 μM DOC. We observed changes in community composition and activity in incubations already within 12 h where tDOM was added. Flow cytometry revealed that predominantly large bacteria increased in the tDOM treated incubations. The increase of this group correlated with the increase in relative abundance of the genus Glaciecola (Gammaproteobacteria). Glaciecola were initially not abundant in the bacterial community (0.6%), but their subsequent increase up to 47% after 4 days upon tDOM addition compared to 8% in control incubations indicates that they are likely capable of degrading permafrost derived DOM. Further, according to our experimental results we hypothesize that the tDOM addition increased bacterivorous grazing by small protists and thus tDOM might indirectly also effect higher trophic levels of the microbial food web. publishedVersion Article in Journal/Newspaper Arctic Arctic Kongsfjord* Kongsfjorden permafrost Svalbard University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Svalbard Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Müller, Oliver Seuthe, Lena Bratbak, Gunnar Paulsen, Maria Lund Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 |
description |
The warming of the Arctic causes increased riverine discharge, coastal erosion, and the thawing of permafrost. Together, this is leading to an increased wash out of terrestrial dissolved organic matter (tDOM) into the coastal Arctic ecosystems. This tDOM may be anticipated to affect both carbon and nutrient flow in the microbial food web and microbial community composition, but there are few studies detailing this in Arctic marine ecosystems. We tested the effects of tDOM on the bacterial community composition and net-growth by extracting DOM from the active layer of permafrost soil and adding the aged tDOM concentrate to a natural microbial fjord community (Kongsfjorden, NW Svalbard). This resulted in an increased carbon load of 128 μM DOC in the tDOM treatment relative to the control of 83 μM DOC. We observed changes in community composition and activity in incubations already within 12 h where tDOM was added. Flow cytometry revealed that predominantly large bacteria increased in the tDOM treated incubations. The increase of this group correlated with the increase in relative abundance of the genus Glaciecola (Gammaproteobacteria). Glaciecola were initially not abundant in the bacterial community (0.6%), but their subsequent increase up to 47% after 4 days upon tDOM addition compared to 8% in control incubations indicates that they are likely capable of degrading permafrost derived DOM. Further, according to our experimental results we hypothesize that the tDOM addition increased bacterivorous grazing by small protists and thus tDOM might indirectly also effect higher trophic levels of the microbial food web. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Müller, Oliver Seuthe, Lena Bratbak, Gunnar Paulsen, Maria Lund |
author_facet |
Müller, Oliver Seuthe, Lena Bratbak, Gunnar Paulsen, Maria Lund |
author_sort |
Müller, Oliver |
title |
Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord |
title_short |
Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord |
title_full |
Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord |
title_fullStr |
Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord |
title_full_unstemmed |
Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord |
title_sort |
bacterial response to permafrost derived organic matter input in an arctic fjord |
publisher |
Frontiers |
publishDate |
2018 |
url |
https://hdl.handle.net/1956/18526 https://doi.org/10.3389/fmars.2018.00263 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic Kongsfjord* Kongsfjorden permafrost Svalbard |
genre_facet |
Arctic Arctic Kongsfjord* Kongsfjorden permafrost Svalbard |
op_source |
263 Frontiers in Marine Science 5 |
op_relation |
Implications of a changing Arctic on microbial communities: Following the effects of thawing permafrost from land to sea urn:issn:2296-7745 https://hdl.handle.net/1956/18526 https://doi.org/10.3389/fmars.2018.00263 |
op_rights |
Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/ Copyright the Author(s) |
op_doi |
https://doi.org/10.3389/fmars.2018.00263 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
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1766296589711704064 |