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dc.contributor.authorStomeo, Francesca
dc.contributor.authorMakhalanyane, Thulani P.
dc.contributor.authorValverde, Angel
dc.contributor.authorPointing, Stephen B.
dc.contributor.authorStevens, Mark I.
dc.contributor.authorCary, S. Craig
dc.contributor.authorTuffin, Marla I.
dc.contributor.authorCowan, Don A.
dc.identifier.citationStomeo, F., Makhalanyane, T. P., Valverde, A., Pointing, S. B., Stevens, M. I., Cary, C. S., Tuffin, M. I., et al. (2012). Abiotic factors influence microbial diversity in permanently cold soil horizons of a maritime-associated Antarctic Dry Valley. FEMS Microbiology Ecology, 82(2), 326-340. Wiley Blackwell (Blackwell Publishing). doi:10.1111/j.1574-6941.2012.01360.xen_NZ
dc.description.abstractThe 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, eiten_NZ
dc.publisherBlackwell Publishing Ltd.en_NZ
dc.relation.ispartofFEMS Microbiology Ecology
dc.subjectActive layeren_NZ
dc.subjectDry Valleysen_NZ
dc.subjectMicrobial diversityen_NZ
dc.subjectWater vapouren_NZ
dc.titleAbiotic factors influence microbial diversity in permanently cold soil horizons of a maritime-associated Antarctic Dry Valleyen_NZ
dc.typeJournal Articleen_NZ

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