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dc.contributor.author
Scholze, Caroline
dc.contributor.author
Barker Jørgensen, Bo
dc.contributor.author
Roy, Hans
dc.date.accessioned
2020-09-29T11:58:20Z
dc.date.available
2020-09-29T03:27:10Z
dc.date.available
2020-09-29T11:58:20Z
dc.date.issued
2020
dc.identifier.issn
0024-3590
dc.identifier.issn
1939-5590
dc.identifier.other
10.1002/lno.11586
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/443283
dc.description.abstract
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 degrees 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 degrees C in both Svalbard and NE Greenland. But sulfate reduction was not sustainable at this temperature and decreased rapidly over time. Below 26 degrees 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 degrees C and growth yields peaked at even lower temperatures between 0 degrees C and 10 degrees 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.
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.title
Psychrophilic properties of sulfate-reducing bacteria in Arctic marine sediments
en_US
dc.type
Journal Article
dc.date.published
2020-09-15
ethz.journal.title
Limnology and Oceanography
ethz.journal.abbreviated
Limnol. oceanogr.
ethz.size
10 p.
en_US
ethz.identifier.wos
ethz.publication.place
Oxford
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2020-09-29T03:27:15Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.exportRequired
true
ethz.COinS
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