Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments
Microorganisms in the seabed of most of the global oceans live at temperatures close to zero degrees, and in the polar regions even below. Respiration rates of endogenous sulfate-reducing microorganisms in the polar seabed, however, are highest in the range of 18–30°C and much reduced at colder temp...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/68eac451-8923-4307-a29f-5cc2bf95f0ec 2023-09-05T13:15:40+02:00 Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments Scholze, Caroline Jørgensen, Bo Barker Røy, Hans 2021-01 https://pure.au.dk/portal/da/publications/psychrophilic-properties-of-sulfatereducing-bacteria-in-arctic-marine-sediments(68eac451-8923-4307-a29f-5cc2bf95f0ec).html https://doi.org/10.1002/lno.11586 http://www.scopus.com/inward/record.url?scp=85090977834&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Scholze , C , Jørgensen , B B & Røy , H 2021 , ' Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments ' , Limnology and Oceanography , vol. 66 , no. S1 , pp. S293-S302 . https://doi.org/10.1002/lno.11586 article 2021 ftuniaarhuspubl https://doi.org/10.1002/lno.11586 2023-08-23T22:58:18Z Microorganisms in the seabed of most of the global oceans live at temperatures close to zero degrees, and in the polar regions even below. Respiration rates of endogenous sulfate-reducing microorganisms in the polar seabed, however, are highest in the range of 18–30°C and much reduced at colder temperature. In the past, this was seen as indicative of poor adaptation to their cold habitat. We challenge this interpretation, and tested which temperature range allowed sulfate reducers to grow, by adding moderate amounts of volatile fatty acids to high-arctic sediment. Initially, sulfate reduction was highest at 27°C in both Svalbard and NE Greenland. But sulfate reduction was not sustainable at this temperature and decreased rapidly over time. Below 26°C, however, sulfate reduction rates increased exponentially over time, indicating growth of sulfate-reducing microorganisms. We used the increase in the sulfate reduction rates over 4 d to calculate potential growth rates of the endogenous sulfate reducers as function of temperature. From growth rates and respiration rates, we could further calculate the growth yield, also as function of temperature. Highest growth rates were observed at 18°C and growth yields peaked at even lower temperatures between 0°C and 10°C. The maximum growth yield at low temperature revealed a strong psychrophilic adaptation of the sulfate reducers in these Arctic sediments. The fact that growth yield was maximized at in situ temperature but maximum potential growth rate was not, is an indication that yield is the more important parameter for microbial competition in marine sediments. Article in Journal/Newspaper Arctic Arctic Greenland Svalbard Aarhus University: Research Arctic Greenland Svalbard Limnology and Oceanography 66 S1 |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
Microorganisms in the seabed of most of the global oceans live at temperatures close to zero degrees, and in the polar regions even below. Respiration rates of endogenous sulfate-reducing microorganisms in the polar seabed, however, are highest in the range of 18–30°C and much reduced at colder temperature. In the past, this was seen as indicative of poor adaptation to their cold habitat. We challenge this interpretation, and tested which temperature range allowed sulfate reducers to grow, by adding moderate amounts of volatile fatty acids to high-arctic sediment. Initially, sulfate reduction was highest at 27°C in both Svalbard and NE Greenland. But sulfate reduction was not sustainable at this temperature and decreased rapidly over time. Below 26°C, however, sulfate reduction rates increased exponentially over time, indicating growth of sulfate-reducing microorganisms. We used the increase in the sulfate reduction rates over 4 d to calculate potential growth rates of the endogenous sulfate reducers as function of temperature. From growth rates and respiration rates, we could further calculate the growth yield, also as function of temperature. Highest growth rates were observed at 18°C and growth yields peaked at even lower temperatures between 0°C and 10°C. The maximum growth yield at low temperature revealed a strong psychrophilic adaptation of the sulfate reducers in these Arctic sediments. The fact that growth yield was maximized at in situ temperature but maximum potential growth rate was not, is an indication that yield is the more important parameter for microbial competition in marine sediments. |
format |
Article in Journal/Newspaper |
author |
Scholze, Caroline Jørgensen, Bo Barker Røy, Hans |
spellingShingle |
Scholze, Caroline Jørgensen, Bo Barker Røy, Hans Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments |
author_facet |
Scholze, Caroline Jørgensen, Bo Barker Røy, Hans |
author_sort |
Scholze, Caroline |
title |
Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments |
title_short |
Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments |
title_full |
Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments |
title_fullStr |
Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments |
title_full_unstemmed |
Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments |
title_sort |
psychrophilic properties of sulfate-reducing bacteria in arctic marine sediments |
publishDate |
2021 |
url |
https://pure.au.dk/portal/da/publications/psychrophilic-properties-of-sulfatereducing-bacteria-in-arctic-marine-sediments(68eac451-8923-4307-a29f-5cc2bf95f0ec).html https://doi.org/10.1002/lno.11586 http://www.scopus.com/inward/record.url?scp=85090977834&partnerID=8YFLogxK |
geographic |
Arctic Greenland Svalbard |
geographic_facet |
Arctic Greenland Svalbard |
genre |
Arctic Arctic Greenland Svalbard |
genre_facet |
Arctic Arctic Greenland Svalbard |
op_source |
Scholze , C , Jørgensen , B B & Røy , H 2021 , ' Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments ' , Limnology and Oceanography , vol. 66 , no. S1 , pp. S293-S302 . https://doi.org/10.1002/lno.11586 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/lno.11586 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
S1 |
_version_ |
1776197525898788864 |