onr:"swepub:oai:DiVA.org:su-50145"
Search: onr:"swepub:oai:DiVA.org:su-50145" > Effects of freeze-t...
- 1 of 1
- Previous record
- Next record
- To hitlist
- Sawicka, Joanna E. (author)
Effects of freeze-thaw cycles on anaerobic microbial processes in an Arctic intertidal mud flat
- Article/chapterEnglish2010
Publisher, publication year, extent ...
- 2009-12-24
- Springer Science and Business Media LLC,2010
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:su-50145
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-50145URI
- https://doi.org/10.1038/ismej.2009.140DOI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- authorCount :5
- Insight into the effects of repeated freezing and thawing on microbial processes in sediments and soils is important for understanding sediment carbon cycling at high latitudes acutely affected by global warming. Microbial responses to repeated freeze-thaw conditions were studied in three complementary experiments using arctic sediment collected from an intertidal flat that is exposed to seasonal freeze-thaw conditions (Ymerbukta, Svalbard, Arctic Ocean). The sediment was subjected to oscillating freeze-thaw incubations, either gradual, from -5 to 4 degrees C, or abrupt, from -20 to 10 degrees C. Concentrations of low-molecular weight carboxylic acids (volatile fatty acids) were measured and sulfate reduction was assessed by measuring S-35 sulfate reduction rates (SRRs). Gradual freeze-thaw incubation decreased microbial activity in the frozen state to 0.25 % of initial levels at 4 degrees C, but activity resumed rapidly reaching >60 % of initial activity in the thawed state. Exposure of sediments to successive large temperature changes (-20 versus 10 degrees C) decreased SRR by 80% of the initial activity, suggesting that a fraction of the bacterial community recovered rapidly from extreme temperature fluctuations. This is supported by 16S rRNA gene-based denaturing gradient gel electrophoresis profiles that revealed persistence of the dominant microbial taxa under repeated freeze-thaw cycles. The fast recovery of the SRRs suggests that carbon mineralization in thawing arctic sediment can resume without delay or substantial growth of microbial populations.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
- arctic sediment
- freeze-thaw effects
- sulfate reduction
- fermentation
- volatile fatty acids
- DGGE
- Earth sciences
- Geovetenskap
Added entries (persons, corporate bodies, meetings, titles ...)
- Robador, Alberto (author)
- Hubert, Casey (author)
- Jorgensen, Bo Barker (author)
- Bruchert, VolkerStockholms universitet,Institutionen för geologi och geokemi(Swepub:su)vbruc (author)
- Stockholms universitetInstitutionen för geologi och geokemi (creator_code:org_t)
Related titles
- In:ISME Journal: Springer Science and Business Media LLC4:4, s. 585-5941751-73621751-7370
Internet link
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Sawicka, Joanna ...
- Robador, Alberto
- Hubert, Casey
- Jorgensen, Bo Ba ...
- Bruchert, Volker
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Earth and Relate ...
- Articles in the publication
- ISME Journal
- By the university
- Stockholm University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
