2011
DOI: 10.1139/w11-004
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Microbial diversity of active layer and permafrost in an acidic wetland from the Canadian High Arctic

Abstract: The abundance and structure of archaeal and bacterial communities from the active layer and the associated permafrost of a moderately acidic (pH < 5.0) High Arctic wetland (Axel Heiberg Island, Nunavut, Canada) were investigated using culture-and molecular-based methods. Aerobic viable cell counts from the active layer were ∼100-fold greater than those from the permafrost (2.5 × 10 5 CFU·(g soil dry mass) -1 ); however, a greater diversity of isolates were cultured from permafrost, as determined by 16S rRNA ge… Show more

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Cited by 158 publications
(101 citation statements)
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“…The core microbiome of this study has a different composition than those reads found only in individual samples, with the aforementioned preponderance of Thermoprotei. This is perhaps not unexpected, as Crenarchaeota contains radio-and thermotolerant species detected previously in other extreme environments, including desert soils (16,21), hot springs (75), permafrost (80), and marine environments near the Sonoran Desert (8). The rare OTUs appear to be relatively similar in terms of the proportion of various phyla between sample sites.…”
Section: Discussionsupporting
confidence: 74%
“…The core microbiome of this study has a different composition than those reads found only in individual samples, with the aforementioned preponderance of Thermoprotei. This is perhaps not unexpected, as Crenarchaeota contains radio-and thermotolerant species detected previously in other extreme environments, including desert soils (16,21), hot springs (75), permafrost (80), and marine environments near the Sonoran Desert (8). The rare OTUs appear to be relatively similar in terms of the proportion of various phyla between sample sites.…”
Section: Discussionsupporting
confidence: 74%
“…Glaciers also play an important role in regulating river flow and aquatic life through their influence on water availability, temperature and aquatic chemistry. Distinctive microbial ecosystems have been found in snow, sea ice, and permafrost (Vincent et al 2009;Wilhelm et al 2011), as well as on and beneath glaciers and ice shelves (Mueller and Pollard 2004;Mueller et al 2006). …”
Section: Introductionmentioning
confidence: 99%
“…On the other hand, the permafrost, experiencing constant "winter" conditions with sub-zero temperatures and subsequent low water and nutrients availability, should rather select for oligotrophic organisms with low, but steady growth rates under such conditions. On this background, two recent studies from the Canadian high Arctic (Wilhelm et al, 2011;Yergeau et al, 2010) indicate surprisingly moderate differences in gross phylogenetic composition and profiles of functional genes between the thawed upper active layer and the permafrost layer below. Both layers were found to harbor the same phyla that are also characteristic of upper soils of boreal forest in the Northern hemisphere (Neufeld and Mohn, 2005).…”
Section: The Terrestrial Environmentmentioning
confidence: 99%