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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ftdoajarticles:oai:doaj.org/article:2c942cc31aa14844a39909c3d1e68b00 2023-05-15T14:48:18+02:00 Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord Oliver Müller Lena Seuthe Gunnar Bratbak Maria L. Paulsen 2018-08-01T00:00:00Z https://doi.org/10.3389/fmars.2018.00263 https://doaj.org/article/2c942cc31aa14844a39909c3d1e68b00 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2018.00263/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00263 https://doaj.org/article/2c942cc31aa14844a39909c3d1e68b00 Frontiers in Marine Science, Vol 5 (2018) dissolved organic matter Arctic terrestrial run-off permafrost tDOM Kongsfjorden Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2018 ftdoajarticles https://doi.org/10.3389/fmars.2018.00263 2022-12-31T16:24:41Z 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. Article in Journal/Newspaper Arctic Kongsfjord* Kongsfjorden permafrost Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
dissolved organic matter Arctic terrestrial run-off permafrost tDOM Kongsfjorden Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
dissolved organic matter Arctic terrestrial run-off permafrost tDOM Kongsfjorden Science Q General. Including nature conservation geographical distribution QH1-199.5 Oliver Müller Lena Seuthe Gunnar Bratbak Maria L. Paulsen Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord |
topic_facet |
dissolved organic matter Arctic terrestrial run-off permafrost tDOM Kongsfjorden Science Q General. Including nature conservation geographical distribution QH1-199.5 |
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. |
format |
Article in Journal/Newspaper |
author |
Oliver Müller Lena Seuthe Gunnar Bratbak Maria L. Paulsen |
author_facet |
Oliver Müller Lena Seuthe Gunnar Bratbak Maria L. Paulsen |
author_sort |
Oliver Müller |
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 Media S.A. |
publishDate |
2018 |
url |
https://doi.org/10.3389/fmars.2018.00263 https://doaj.org/article/2c942cc31aa14844a39909c3d1e68b00 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Kongsfjord* Kongsfjorden permafrost Svalbard |
genre_facet |
Arctic Kongsfjord* Kongsfjorden permafrost Svalbard |
op_source |
Frontiers in Marine Science, Vol 5 (2018) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2018.00263/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00263 https://doaj.org/article/2c942cc31aa14844a39909c3d1e68b00 |
op_doi |
https://doi.org/10.3389/fmars.2018.00263 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
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1766319385958416384 |