Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments
The temperature responses of sulfate-reducing microbial communities were used as community temperature characteristics for their in situ temperature adaptation, their origin, and dispersal in the deep sea. Sediments were collected from a suite of coastal, continental shelf, and slope sediments from...
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ftdoajarticles:oai:doaj.org/article:9afadec1c99e432f9d1264dcf79a9eca 2023-05-15T14:56:55+02:00 Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments J. E. Sawicka B. B. Jørgensen V. Brüchert 2012-08-01T00:00:00Z https://doi.org/10.5194/bg-9-3425-2012 https://doaj.org/article/9afadec1c99e432f9d1264dcf79a9eca EN eng Copernicus Publications http://www.biogeosciences.net/9/3425/2012/bg-9-3425-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-3425-2012 1726-4170 1726-4189 https://doaj.org/article/9afadec1c99e432f9d1264dcf79a9eca Biogeosciences, Vol 9, Iss 8, Pp 3425-3435 (2012) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2012 ftdoajarticles https://doi.org/10.5194/bg-9-3425-2012 2022-12-30T22:39:00Z The temperature responses of sulfate-reducing microbial communities were used as community temperature characteristics for their in situ temperature adaptation, their origin, and dispersal in the deep sea. Sediments were collected from a suite of coastal, continental shelf, and slope sediments from the southwest and southeast Atlantic and permanently cold Arctic fjords from water depths ranging from the intertidal zone to 4327 m. In situ temperatures ranged from 8 °C on the shelf to −1 °C in the Arctic. Temperature characteristics of the active sulfate-reducing community were determined in short-term incubations with 35 S-sulfate in a temperature gradient block spanning a temperature range from 0 to 40 °C. An optimum temperature ( T opt ) between 27 °C and 30 °C for the South Atlantic shelf sediments and for the intertidal flat sediment from Svalbard was indicative of a psychrotolerant/mesophilic sulfate-reducing community, whereas T opt ≤20 °C in South Atlantic slope and Arctic shelf sediments suggested a predominantly psychrophilic community. High sulfate reduction rates (20–50%) at in situ temperatures compared to those at T opt further support this interpretation and point to the importance of the ambient temperature regime for regulating the short-term temperature response of sulfate-reducing communities. A number of cold (<4 °C) continental slope sediments showed broad temperature optima reaching as high as 30 °C, suggesting the additional presence of apparently mesophilic sulfate-reducing bacteria. Since the temperature characteristics of these mesophiles do not fit with the permanently cold deep-sea environment, we suggest that these mesophilic microorganisms are of allochthonous origin and transported to this site. It is likely that they were deposited along with the mass-flow movement of warmer shelf-derived sediment. These data therefore suggest that temperature response profiles of bacterial carbon mineralization processes can be used as community temperature characteristics, and that mixing of ... Article in Journal/Newspaper Arctic Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Biogeosciences 9 8 3425 3435 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. E. Sawicka B. B. Jørgensen V. Brüchert Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The temperature responses of sulfate-reducing microbial communities were used as community temperature characteristics for their in situ temperature adaptation, their origin, and dispersal in the deep sea. Sediments were collected from a suite of coastal, continental shelf, and slope sediments from the southwest and southeast Atlantic and permanently cold Arctic fjords from water depths ranging from the intertidal zone to 4327 m. In situ temperatures ranged from 8 °C on the shelf to −1 °C in the Arctic. Temperature characteristics of the active sulfate-reducing community were determined in short-term incubations with 35 S-sulfate in a temperature gradient block spanning a temperature range from 0 to 40 °C. An optimum temperature ( T opt ) between 27 °C and 30 °C for the South Atlantic shelf sediments and for the intertidal flat sediment from Svalbard was indicative of a psychrotolerant/mesophilic sulfate-reducing community, whereas T opt ≤20 °C in South Atlantic slope and Arctic shelf sediments suggested a predominantly psychrophilic community. High sulfate reduction rates (20–50%) at in situ temperatures compared to those at T opt further support this interpretation and point to the importance of the ambient temperature regime for regulating the short-term temperature response of sulfate-reducing communities. A number of cold (<4 °C) continental slope sediments showed broad temperature optima reaching as high as 30 °C, suggesting the additional presence of apparently mesophilic sulfate-reducing bacteria. Since the temperature characteristics of these mesophiles do not fit with the permanently cold deep-sea environment, we suggest that these mesophilic microorganisms are of allochthonous origin and transported to this site. It is likely that they were deposited along with the mass-flow movement of warmer shelf-derived sediment. These data therefore suggest that temperature response profiles of bacterial carbon mineralization processes can be used as community temperature characteristics, and that mixing of ... |
format |
Article in Journal/Newspaper |
author |
J. E. Sawicka B. B. Jørgensen V. Brüchert |
author_facet |
J. E. Sawicka B. B. Jørgensen V. Brüchert |
author_sort |
J. E. Sawicka |
title |
Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments |
title_short |
Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments |
title_full |
Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments |
title_fullStr |
Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments |
title_full_unstemmed |
Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments |
title_sort |
temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/bg-9-3425-2012 https://doaj.org/article/9afadec1c99e432f9d1264dcf79a9eca |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Svalbard |
genre_facet |
Arctic Svalbard |
op_source |
Biogeosciences, Vol 9, Iss 8, Pp 3425-3435 (2012) |
op_relation |
http://www.biogeosciences.net/9/3425/2012/bg-9-3425-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-3425-2012 1726-4170 1726-4189 https://doaj.org/article/9afadec1c99e432f9d1264dcf79a9eca |
op_doi |
https://doi.org/10.5194/bg-9-3425-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
8 |
container_start_page |
3425 |
op_container_end_page |
3435 |
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1766328968793817088 |