Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments
Udgivelsesdato: 2008-Aug Anaerobic degradation of organic material generally proceeds through a sequence of steps, including polymer hydrolysis, fermentation and respiration or methanogenesis. The intermediates, such as volatile fatty acids (VFA) or H(2), are generally maintained at low concentratio...
Published in: | The ISME Journal |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2008
|
Subjects: | |
Online Access: | https://portal.findresearcher.sdu.dk/da/publications/c77477c0-3b43-11de-b0ce-000ea68e967b https://doi.org/10.1038/ISMEJ.2008.20 |
id |
ftsydanskunivpub:oai:sdu.dk:publications/c77477c0-3b43-11de-b0ce-000ea68e967b |
---|---|
record_format |
openpolar |
spelling |
ftsydanskunivpub:oai:sdu.dk:publications/c77477c0-3b43-11de-b0ce-000ea68e967b 2024-09-15T17:50:44+00:00 Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments Finke, Niko Jørgensen, Bo Barker 2008-08-01 https://portal.findresearcher.sdu.dk/da/publications/c77477c0-3b43-11de-b0ce-000ea68e967b https://doi.org/10.1038/ISMEJ.2008.20 eng eng https://portal.findresearcher.sdu.dk/da/publications/c77477c0-3b43-11de-b0ce-000ea68e967b info:eu-repo/semantics/restrictedAccess Finke , N & Jørgensen , B B 2008 , ' Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments ' , The ISME Journal , vol. 2 , no. 8 , pp. 815-829 . https://doi.org/10.1038/ISMEJ.2008.20 Archaea Bacteria Fatty Acids Volatile Fermentation Geologic Sediments Hydrogen Methane North Sea Oxidation-Reduction Sulfates Svalbard Temperature Time Factors article 2008 ftsydanskunivpub https://doi.org/10.1038/ISMEJ.2008.20 2024-06-25T14:18:22Z Udgivelsesdato: 2008-Aug Anaerobic degradation of organic material generally proceeds through a sequence of steps, including polymer hydrolysis, fermentation and respiration or methanogenesis. The intermediates, such as volatile fatty acids (VFA) or H(2), are generally maintained at low concentration, showing a close coupling of the terminal oxidation to fermentation. We exposed marine sediments to extreme temperature perturbations to study the nature and robustness of this coupling. Bacterial sulfate reduction and its dependence on fermentation were studied experimentally over a broad temperature range of -0.3 to 40 degrees C in sediments from temperate and permanently cold environments. In an Arctic sediment from Svalbard, the apparent optimum temperature for sulfate reduction decreased with prolonged incubation, whereas sulfate reduction rates increased. In a temperate sediment from the North Sea, the apparent optimum temperature was higher and did not change with incubation time. Up to a critical temperature, the concentrations of VFA remained low, <3 microM for acetate and <1 microM for the other VFA, the H(2) concentration showed thermodynamic control by sulfate-reducing bacteria, revealing a close coupling of fermentation and sulfate reduction. Above the critical temperature, the concentrations of VFA and H(2) increased transiently by 100-1000-fold. According to the different in situ temperatures of the samples, the critical temperature was lower for sediments from the Arctic than from the North Sea. The H(2) concentrations decreased again upon prolonged incubation to values typical for sulfate-depleted methanogenic sediments. This suggests that fermentative bacteria and methanogenic archaea in both sediments tolerated higher temperatures than the sulfate-reducing community. Article in Journal/Newspaper Arctic Svalbard University of Southern Denmark Research Portal The ISME Journal 2 8 815 829 |
institution |
Open Polar |
collection |
University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
topic |
Archaea Bacteria Fatty Acids Volatile Fermentation Geologic Sediments Hydrogen Methane North Sea Oxidation-Reduction Sulfates Svalbard Temperature Time Factors |
spellingShingle |
Archaea Bacteria Fatty Acids Volatile Fermentation Geologic Sediments Hydrogen Methane North Sea Oxidation-Reduction Sulfates Svalbard Temperature Time Factors Finke, Niko Jørgensen, Bo Barker Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments |
topic_facet |
Archaea Bacteria Fatty Acids Volatile Fermentation Geologic Sediments Hydrogen Methane North Sea Oxidation-Reduction Sulfates Svalbard Temperature Time Factors |
description |
Udgivelsesdato: 2008-Aug Anaerobic degradation of organic material generally proceeds through a sequence of steps, including polymer hydrolysis, fermentation and respiration or methanogenesis. The intermediates, such as volatile fatty acids (VFA) or H(2), are generally maintained at low concentration, showing a close coupling of the terminal oxidation to fermentation. We exposed marine sediments to extreme temperature perturbations to study the nature and robustness of this coupling. Bacterial sulfate reduction and its dependence on fermentation were studied experimentally over a broad temperature range of -0.3 to 40 degrees C in sediments from temperate and permanently cold environments. In an Arctic sediment from Svalbard, the apparent optimum temperature for sulfate reduction decreased with prolonged incubation, whereas sulfate reduction rates increased. In a temperate sediment from the North Sea, the apparent optimum temperature was higher and did not change with incubation time. Up to a critical temperature, the concentrations of VFA remained low, <3 microM for acetate and <1 microM for the other VFA, the H(2) concentration showed thermodynamic control by sulfate-reducing bacteria, revealing a close coupling of fermentation and sulfate reduction. Above the critical temperature, the concentrations of VFA and H(2) increased transiently by 100-1000-fold. According to the different in situ temperatures of the samples, the critical temperature was lower for sediments from the Arctic than from the North Sea. The H(2) concentrations decreased again upon prolonged incubation to values typical for sulfate-depleted methanogenic sediments. This suggests that fermentative bacteria and methanogenic archaea in both sediments tolerated higher temperatures than the sulfate-reducing community. |
format |
Article in Journal/Newspaper |
author |
Finke, Niko Jørgensen, Bo Barker |
author_facet |
Finke, Niko Jørgensen, Bo Barker |
author_sort |
Finke, Niko |
title |
Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments |
title_short |
Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments |
title_full |
Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments |
title_fullStr |
Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments |
title_full_unstemmed |
Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments |
title_sort |
response of fermentation and sulfate reduction to experimental temperature changes in temperate and arctic marine sediments |
publishDate |
2008 |
url |
https://portal.findresearcher.sdu.dk/da/publications/c77477c0-3b43-11de-b0ce-000ea68e967b https://doi.org/10.1038/ISMEJ.2008.20 |
genre |
Arctic Svalbard |
genre_facet |
Arctic Svalbard |
op_source |
Finke , N & Jørgensen , B B 2008 , ' Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments ' , The ISME Journal , vol. 2 , no. 8 , pp. 815-829 . https://doi.org/10.1038/ISMEJ.2008.20 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/c77477c0-3b43-11de-b0ce-000ea68e967b |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1038/ISMEJ.2008.20 |
container_title |
The ISME Journal |
container_volume |
2 |
container_issue |
8 |
container_start_page |
815 |
op_container_end_page |
829 |
_version_ |
1810292539004026880 |