Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature
Summary Marine sediments harbour diverse populations of dormant thermophilic bacterial spores that become active in sediment incubation experiments at much higher than in situ temperature. This response was investigated in the presence of natural complex organic matter in sediments of two Arctic fjo...
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Online Access: | http://dx.doi.org/10.1111/j.1462-2920.2010.02161.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1462-2920.2010.02161.x http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1462-2920.2010.02161.x/fullpdf |
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crwiley:10.1111/j.1462-2920.2010.02161.x 2024-10-13T14:04:49+00:00 Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature Hubert, Casey Arnosti, Carol Brüchert, Volker Loy, Alexander Vandieken, Verona Jørgensen, Bo Barker 2010 http://dx.doi.org/10.1111/j.1462-2920.2010.02161.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1462-2920.2010.02161.x http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1462-2920.2010.02161.x/fullpdf en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Environmental Microbiology volume 12, issue 4, page 1089-1104 ISSN 1462-2912 1462-2920 journal-article 2010 crwiley https://doi.org/10.1111/j.1462-2920.2010.02161.x 2024-09-17T04:52:38Z Summary Marine sediments harbour diverse populations of dormant thermophilic bacterial spores that become active in sediment incubation experiments at much higher than in situ temperature. This response was investigated in the presence of natural complex organic matter in sediments of two Arctic fjords, as well as with the addition of freeze‐dried Spirulina or individual high‐molecular‐weight polysaccharides. During 50°C incubation experiments, Arctic thermophiles catalysed extensive mineralization of the organic matter via extracellular enzymatic hydrolysis, fermentation and sulfate reduction. This high temperature‐induced food chain mirrors sediment microbial processes occurring at cold in situ temperatures (near 0°C), yet it is catalysed by a completely different set of microorganisms. Using sulfate reduction rates (SRR) as a proxy for organic matter mineralization showed that differences in organic matter reactivity determined the extent of the thermophilic response. Fjord sediments with higher in situ SRR also supported higher SRR at 50°C. Amendment with Spirulina significantly increased volatile fatty acids production and SRR relative to unamended sediment in 50°C incubations. Spirulina amendment also revealed temporally distinct sulfate reduction phases, consistent with 16S rRNA clone library detection of multiple thermophilic Desulfotomaculum spp. enriched at 50°C. Incubations with four different fluorescently labelled polysaccharides at 4°C and 50°C showed that the thermophilic population in Arctic sediments produce a different suite of polymer‐hydrolysing enzymes than those used in situ by the cold‐adapted microbial community. Over time, dormant marine microorganisms like these are buried in marine sediments and might eventually encounter warmer conditions that favour their activation. Distinct enzymatic capacities for organic polymer degradation could allow specific heterotrophic populations like these to play a role in sustaining microbial metabolism in the deep, warm, marine biosphere. Article in Journal/Newspaper Arctic Wiley Online Library Arctic Environmental Microbiology 12 4 1089 1104 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Summary Marine sediments harbour diverse populations of dormant thermophilic bacterial spores that become active in sediment incubation experiments at much higher than in situ temperature. This response was investigated in the presence of natural complex organic matter in sediments of two Arctic fjords, as well as with the addition of freeze‐dried Spirulina or individual high‐molecular‐weight polysaccharides. During 50°C incubation experiments, Arctic thermophiles catalysed extensive mineralization of the organic matter via extracellular enzymatic hydrolysis, fermentation and sulfate reduction. This high temperature‐induced food chain mirrors sediment microbial processes occurring at cold in situ temperatures (near 0°C), yet it is catalysed by a completely different set of microorganisms. Using sulfate reduction rates (SRR) as a proxy for organic matter mineralization showed that differences in organic matter reactivity determined the extent of the thermophilic response. Fjord sediments with higher in situ SRR also supported higher SRR at 50°C. Amendment with Spirulina significantly increased volatile fatty acids production and SRR relative to unamended sediment in 50°C incubations. Spirulina amendment also revealed temporally distinct sulfate reduction phases, consistent with 16S rRNA clone library detection of multiple thermophilic Desulfotomaculum spp. enriched at 50°C. Incubations with four different fluorescently labelled polysaccharides at 4°C and 50°C showed that the thermophilic population in Arctic sediments produce a different suite of polymer‐hydrolysing enzymes than those used in situ by the cold‐adapted microbial community. Over time, dormant marine microorganisms like these are buried in marine sediments and might eventually encounter warmer conditions that favour their activation. Distinct enzymatic capacities for organic polymer degradation could allow specific heterotrophic populations like these to play a role in sustaining microbial metabolism in the deep, warm, marine biosphere. |
format |
Article in Journal/Newspaper |
author |
Hubert, Casey Arnosti, Carol Brüchert, Volker Loy, Alexander Vandieken, Verona Jørgensen, Bo Barker |
spellingShingle |
Hubert, Casey Arnosti, Carol Brüchert, Volker Loy, Alexander Vandieken, Verona Jørgensen, Bo Barker Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature |
author_facet |
Hubert, Casey Arnosti, Carol Brüchert, Volker Loy, Alexander Vandieken, Verona Jørgensen, Bo Barker |
author_sort |
Hubert, Casey |
title |
Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature |
title_short |
Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature |
title_full |
Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature |
title_fullStr |
Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature |
title_full_unstemmed |
Thermophilic anaerobes in Arctic marine sediments induced to mineralize complex organic matter at high temperature |
title_sort |
thermophilic anaerobes in arctic marine sediments induced to mineralize complex organic matter at high temperature |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1462-2920.2010.02161.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1462-2920.2010.02161.x http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1462-2920.2010.02161.x/fullpdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Environmental Microbiology volume 12, issue 4, page 1089-1104 ISSN 1462-2912 1462-2920 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1462-2920.2010.02161.x |
container_title |
Environmental Microbiology |
container_volume |
12 |
container_issue |
4 |
container_start_page |
1089 |
op_container_end_page |
1104 |
_version_ |
1812810483645808640 |