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Type: Journal article
Title: Abiotic factors influence microbial diversity in permanently cold soil horizons of a maritime-associated Antarctic Dry Valley
Author: Stomeo, F.
Makhalanyane, T.
Valverde, A.
Pointing, S.
Stevens, M.
Cary, C.
Tuffin, I.
Cowan, D.
Citation: FEMS Microbiology Ecology, 2012; 82(2):326-340
Publisher: Elsevier Science BV
Issue Date: 2012
ISSN: 0168-6496
Statement of
Francesca Stomeo, Thulani P. Makhalanyane, Angel Valverde, Stephen B. Pointing, Mark I. Stevens, Craig S. Cary, Marla I. Tuffin & Don A. Cowan
Abstract: The McMurdo Dry Valleys collectively comprise the most extensive ice-free region in Antarctica and are considered one of the coldest arid environments on Earth. In low-altitude maritime-associated valleys, mineral soil profiles show distinct horizontal structuring, with a surface arid zone overlying a moist and biologically active zone generated by seasonally melted permafrost. In this study, long-term microenvironmental monitoring data show that temperature and soil humidity regimes vary in the soil horizons of north- and south-facing slopes within the Miers Valley, a maritime valley in the McMurdo Dry Valleys. We found that soil bacterial communities varied from the north to the south. The microbial assemblages at the surface and shallow subsurface depths displayed higher metabolic activity and diversity compared to the permafrost soil interface. Multivariate analysis indicated that K, C, Ca and moisture influenced the distribution and structure of microbial populations. Furthermore, because of the large % RH gradient between the frozen subsurface and the soil surface we propose that water transported to the surface as water vapour is available to microbial populations, either as a result of condensation processes or by direct adsorption from the vapour phase.
Keywords: Antarctica; Dry Valleys; active layer; microbial diversity; permafrost; water vapour
Rights: © 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved
RMID: 0020122518
DOI: 10.1111/j.1574-6941.2012.01360.x
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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