Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments
Abstract 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 H2, are generally maintained at low concentration, showing a close...
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croxfordunivpr:10.1038/ismej.2008.20 2024-06-23T07:49:55+00:00 Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments Finke, Niko Jørgensen, Bo Barker 2008 http://dx.doi.org/10.1038/ismej.2008.20 http://www.nature.com/articles/ismej200820.pdf http://www.nature.com/articles/ismej200820 https://academic.oup.com/ismej/article-pdf/2/8/815/56442392/41396_2008_article_bfismej200820.pdf en eng Oxford University Press (OUP) https://academic.oup.com/pages/standard-publication-reuse-rights The ISME Journal volume 2, issue 8, page 815-829 ISSN 1751-7362 1751-7370 journal-article 2008 croxfordunivpr https://doi.org/10.1038/ismej.2008.20 2024-06-11T04:22:31Z Abstract 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 H2, 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 °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 μm for acetate and <1 μm for the other VFA, the H2 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 H2 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 H2 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 Oxford University Press Arctic Svalbard The ISME Journal 2 8 815 829 |
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Abstract 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 H2, 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 °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 μm for acetate and <1 μm for the other VFA, the H2 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 H2 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 H2 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 |
spellingShingle |
Finke, Niko Jørgensen, Bo Barker Response of fermentation and sulfate reduction to experimental temperature changes in temperate and Arctic marine sediments |
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 |
publisher |
Oxford University Press (OUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1038/ismej.2008.20 http://www.nature.com/articles/ismej200820.pdf http://www.nature.com/articles/ismej200820 https://academic.oup.com/ismej/article-pdf/2/8/815/56442392/41396_2008_article_bfismej200820.pdf |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Svalbard |
genre_facet |
Arctic Svalbard |
op_source |
The ISME Journal volume 2, issue 8, page 815-829 ISSN 1751-7362 1751-7370 |
op_rights |
https://academic.oup.com/pages/standard-publication-reuse-rights |
op_doi |
https://doi.org/10.1038/ismej.2008.20 |
container_title |
The ISME Journal |
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2 |
container_issue |
8 |
container_start_page |
815 |
op_container_end_page |
829 |
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1802640638999527424 |