The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments
Arctic regions may be particularly sensitive to climate warming and, consequently, rates of carbon mineralization in warming marine sediment may also be affected. Using long-term (24 months) incubation experiments at 0°C, 10°C and 20°C, the temperature response of metabolic activity and community co...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/21.11116/0000-0001-CBF0-B http://hdl.handle.net/21.11116/0000-0007-AF31-D |
id |
ftpubman:oai:pure.mpg.de:item_2485176 |
---|---|
record_format |
openpolar |
spelling |
ftpubman:oai:pure.mpg.de:item_2485176 2023-08-20T04:03:51+02:00 The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments Robador, A. Brüchert, V. Jørgensen, B. 2009-07-01 application/pdf http://hdl.handle.net/21.11116/0000-0001-CBF0-B http://hdl.handle.net/21.11116/0000-0007-AF31-D eng eng http://hdl.handle.net/21.11116/0000-0001-CBF0-B http://hdl.handle.net/21.11116/0000-0007-AF31-D Environmental Microbiology info:eu-repo/semantics/article 2009 ftpubman 2023-08-01T23:11:12Z Arctic regions may be particularly sensitive to climate warming and, consequently, rates of carbon mineralization in warming marine sediment may also be affected. Using long-term (24 months) incubation experiments at 0°C, 10°C and 20°C, the temperature response of metabolic activity and community composition of sulfate-reducing bacteria were studied in the permanently cold sediment of north-western Svalbard (Arctic Ocean) and compared with a temperate habitat with seasonally varying temperature (German Bight, North Sea). Short-term (35)S-sulfate tracer incubations in a temperature-gradient block (between -3.5°C and +40°C) were used to assess variations in sulfate reduction rates during the course of the experiment. Warming of arctic sediment resulted in a gradual increase of the temperature optima (T(opt)) for sulfate reduction suggesting a positive selection of psychrotolerant/mesophilic sulfate-reducing bacteria (SRB). However, high rates at in situ temperatures compared with maximum rates showed the predominance of psychrophilic SRB even at high incubation temperatures. Changing apparent activation energies (E(a)) showed that increasing temperatures had an initial negative impact on sulfate reduction that was weaker after prolonged incubations, which could imply an acclimatization response rather than a selection process of the SRB community. The microbial community composition was analysed by targeting the 16S ribosomal RNA using catalysed reporter deposition fluorescence in situ hybridization (CARD-FISH). The results showed the decline of specific groups of SRB and confirmed a strong impact of increasing temperatures on the microbial community composition of arctic sediment. Conversely, in seasonally changing sediment sulfate reduction rates and sulfate-reducing bacterial abundance changed little in response to changing temperature. Article in Journal/Newspaper Arctic Arctic Ocean Svalbard Max Planck Society: MPG.PuRe Arctic Arctic Ocean Svalbard |
institution |
Open Polar |
collection |
Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
Arctic regions may be particularly sensitive to climate warming and, consequently, rates of carbon mineralization in warming marine sediment may also be affected. Using long-term (24 months) incubation experiments at 0°C, 10°C and 20°C, the temperature response of metabolic activity and community composition of sulfate-reducing bacteria were studied in the permanently cold sediment of north-western Svalbard (Arctic Ocean) and compared with a temperate habitat with seasonally varying temperature (German Bight, North Sea). Short-term (35)S-sulfate tracer incubations in a temperature-gradient block (between -3.5°C and +40°C) were used to assess variations in sulfate reduction rates during the course of the experiment. Warming of arctic sediment resulted in a gradual increase of the temperature optima (T(opt)) for sulfate reduction suggesting a positive selection of psychrotolerant/mesophilic sulfate-reducing bacteria (SRB). However, high rates at in situ temperatures compared with maximum rates showed the predominance of psychrophilic SRB even at high incubation temperatures. Changing apparent activation energies (E(a)) showed that increasing temperatures had an initial negative impact on sulfate reduction that was weaker after prolonged incubations, which could imply an acclimatization response rather than a selection process of the SRB community. The microbial community composition was analysed by targeting the 16S ribosomal RNA using catalysed reporter deposition fluorescence in situ hybridization (CARD-FISH). The results showed the decline of specific groups of SRB and confirmed a strong impact of increasing temperatures on the microbial community composition of arctic sediment. Conversely, in seasonally changing sediment sulfate reduction rates and sulfate-reducing bacterial abundance changed little in response to changing temperature. |
format |
Article in Journal/Newspaper |
author |
Robador, A. Brüchert, V. Jørgensen, B. |
spellingShingle |
Robador, A. Brüchert, V. Jørgensen, B. The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments |
author_facet |
Robador, A. Brüchert, V. Jørgensen, B. |
author_sort |
Robador, A. |
title |
The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments |
title_short |
The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments |
title_full |
The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments |
title_fullStr |
The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments |
title_full_unstemmed |
The impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments |
title_sort |
impact of temperature change on the activity and community composition of sulfate-reducing bacteria in arctic versus temperate marine sediments |
publishDate |
2009 |
url |
http://hdl.handle.net/21.11116/0000-0001-CBF0-B http://hdl.handle.net/21.11116/0000-0007-AF31-D |
geographic |
Arctic Arctic Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Svalbard |
genre |
Arctic Arctic Ocean Svalbard |
genre_facet |
Arctic Arctic Ocean Svalbard |
op_source |
Environmental Microbiology |
op_relation |
http://hdl.handle.net/21.11116/0000-0001-CBF0-B http://hdl.handle.net/21.11116/0000-0007-AF31-D |
_version_ |
1774714276453285888 |