Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria
The main mineralization pathways were determined in permanently cold fjord sediment on the west coast of Svalbard. In whole core incubations, the total oxygen uptake rate was 4.2 +/- 0.4 mmol m(-2) d(-1) and the sulfate reduction rate 2.6 +/- 0.6 mmol m(-2) d(-1) at 0 to 20 cm depth. Sulfate reducti...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/55c6f348-3710-4305-8e6d-593e8482738c 2023-05-15T14:24:18+02:00 Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria Vandieken, Verona Finke, Niko Jørgensen, Bo Barker 2006 https://pure.au.dk/portal/da/publications/pathways-of-carbon-oxidation-in-an-arctic-fjord-sediment-svalbard-and-isolation-of-psychrophilic-and-psychrotolerant-feiiireducing-bacteria(55c6f348-3710-4305-8e6d-593e8482738c).html eng eng info:eu-repo/semantics/restrictedAccess Vandieken , V , Finke , N & Jørgensen , B B 2006 , ' Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria ' , Marine Ecology - Progress Series , vol. 322 , pp. 29-41 . article 2006 ftuniaarhuspubl 2022-02-09T23:49:43Z The main mineralization pathways were determined in permanently cold fjord sediment on the west coast of Svalbard. In whole core incubations, the total oxygen uptake rate was 4.2 +/- 0.4 mmol m(-2) d(-1) and the sulfate reduction rate 2.6 +/- 0.6 mmol m(-2) d(-1) at 0 to 20 cm depth. Sulfate reduction was the most important anaerobic mineralization process, accounting for 57 % of anaerobic organic carbon oxidation in anoxic bag incubations of the top 5 cm of the sediment. The remaining 43 % oxidation was attributed to microbial Fe(III) reduction. Both processes occurred concurrently in the uppermost 2 cm, and the Fe-reducing community appeared to be limited mainly by the availability of Fe(III). Below 2 cm, sulfate reduction was the dominant electron-accepting process, Calculations for the uppermost 10 cm of the sediment yielded the following contribution of the different respiratory pathways to total carbon oxidation: aerobic respiration 53 %, sulfate reduction 34 %, Fe(III) reduction 13 %. In situ, the importance of Fe(III) reduction may vary through competition for substrate with oxygen- and nitrate-reducing bacteria in the surface sediment. Fe (111)-reducing bacteria belonging to the genera Desulfuromonas, Desulfuromusa, Shewanella and Desulfovibrio were isolated from enrichment cultures of 2 fjord sediments from Svalbard. Strains related to Desulfovibrio reduced Fe(III) without energy generation for growth. All isolates were psychrophilic or psychro-tolerant and grew at -2 degrees C, the freezing point of sea water, indicating adaptation to permanently cold temperatures. Besides Fe(III), the strains reduced other electron acceptors such as oxygen, manganese, elemental sulfur and sulfate. Article in Journal/Newspaper Arctic Arctic Svalbard Aarhus University: Research Arctic Svalbard |
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Open Polar |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
The main mineralization pathways were determined in permanently cold fjord sediment on the west coast of Svalbard. In whole core incubations, the total oxygen uptake rate was 4.2 +/- 0.4 mmol m(-2) d(-1) and the sulfate reduction rate 2.6 +/- 0.6 mmol m(-2) d(-1) at 0 to 20 cm depth. Sulfate reduction was the most important anaerobic mineralization process, accounting for 57 % of anaerobic organic carbon oxidation in anoxic bag incubations of the top 5 cm of the sediment. The remaining 43 % oxidation was attributed to microbial Fe(III) reduction. Both processes occurred concurrently in the uppermost 2 cm, and the Fe-reducing community appeared to be limited mainly by the availability of Fe(III). Below 2 cm, sulfate reduction was the dominant electron-accepting process, Calculations for the uppermost 10 cm of the sediment yielded the following contribution of the different respiratory pathways to total carbon oxidation: aerobic respiration 53 %, sulfate reduction 34 %, Fe(III) reduction 13 %. In situ, the importance of Fe(III) reduction may vary through competition for substrate with oxygen- and nitrate-reducing bacteria in the surface sediment. Fe (111)-reducing bacteria belonging to the genera Desulfuromonas, Desulfuromusa, Shewanella and Desulfovibrio were isolated from enrichment cultures of 2 fjord sediments from Svalbard. Strains related to Desulfovibrio reduced Fe(III) without energy generation for growth. All isolates were psychrophilic or psychro-tolerant and grew at -2 degrees C, the freezing point of sea water, indicating adaptation to permanently cold temperatures. Besides Fe(III), the strains reduced other electron acceptors such as oxygen, manganese, elemental sulfur and sulfate. |
format |
Article in Journal/Newspaper |
author |
Vandieken, Verona Finke, Niko Jørgensen, Bo Barker |
spellingShingle |
Vandieken, Verona Finke, Niko Jørgensen, Bo Barker Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria |
author_facet |
Vandieken, Verona Finke, Niko Jørgensen, Bo Barker |
author_sort |
Vandieken, Verona |
title |
Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria |
title_short |
Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria |
title_full |
Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria |
title_fullStr |
Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria |
title_full_unstemmed |
Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria |
title_sort |
pathways of carbon oxidation in an arctic fjord sediment (svalbard) and isolation of psychrophilic and psychrotolerant fe(iii)-reducing bacteria |
publishDate |
2006 |
url |
https://pure.au.dk/portal/da/publications/pathways-of-carbon-oxidation-in-an-arctic-fjord-sediment-svalbard-and-isolation-of-psychrophilic-and-psychrotolerant-feiiireducing-bacteria(55c6f348-3710-4305-8e6d-593e8482738c).html |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic Svalbard |
genre_facet |
Arctic Arctic Svalbard |
op_source |
Vandieken , V , Finke , N & Jørgensen , B B 2006 , ' Pathways of carbon oxidation in an Arctic fjord sediment (Svalbard) and isolation of psychrophilic and psychrotolerant Fe(III)-reducing bacteria ' , Marine Ecology - Progress Series , vol. 322 , pp. 29-41 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766296739533291520 |