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Permanent link (DOI): https://doi.org/10.7939/R3XK84Z7Q

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Active heterotrophic microbial communities from polar desert soils of the Canadian High Arctic Open Access

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Other title
Subject/Keyword
Arctic microbiology
stable isotope probing
permafrost
carbon cycling
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Taghavimehr,Elham
Supervisor and department
Brian Lanoil/Biological Sciences
Examining committee member and department
Yan Boucher/Biological Sciences
Tariq Siddique/Renewable Resources
Department
Department of Biological Sciences
Specialization
Microbiology and Biotechnology
Date accepted
2012-09-26T11:42:46Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
Polar warming will lead to increased labile organic carbon in Arctic soils, both from the release of organic carbon stored in permafrost and increased plant production. The impact of increasing organic carbon on Arctic soil microbial community composition and activity is of great interest because microbial decomposition of Arctic soil organic carbon is a potential major source of CO2 to the atmosphere. I determined the activity and composition of the active heterotrophic bacteria in soil cores of the Canadian High Arctic by stable isotope probing (SIP) with a labile organic carbon analogue, 13C-labeled algal lysate. The activity, measured as CO2 production rate, was significantly higher with substrate added compared to the controls. There was a significant decrease in diversity and a shift in community composition following addition of labile carbon. These results suggest only a few groups within the community are active and responsive to increased complex organic carbon.
Language
English
DOI
doi:10.7939/R3XK84Z7Q
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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