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Article: Abiotic factors influence microbial diversity in permanently cold soil horizons of a maritime-associated Antarctic Dry Valley

TitleAbiotic factors influence microbial diversity in permanently cold soil horizons of a maritime-associated Antarctic Dry Valley
Authors
KeywordsActive Layer
Antarctica
Dry Valleys
Microbial Diversity
Permafrost
Water Vapour
Issue Date2012
PublisherWiley-Blackwell Publishing Ltd.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0168-6496
Citation
Fems Microbiology Ecology, 2012, v. 82 n. 2, p. 326-340 How to Cite?
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, either as a result of condensation processes or by direct adsorption from the vapour phase. © 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/179328
ISSN
2015 Impact Factor: 3.53
2015 SCImago Journal Rankings: 1.687
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorStomeo, Fen_US
dc.contributor.authorMakhalanyane, TPen_US
dc.contributor.authorValverde, Aen_US
dc.contributor.authorPointing, SBen_US
dc.contributor.authorStevens, MIen_US
dc.contributor.authorCary, CSen_US
dc.contributor.authorTuffin, MIen_US
dc.contributor.authorCowan, DAen_US
dc.date.accessioned2012-12-19T09:54:14Z-
dc.date.available2012-12-19T09:54:14Z-
dc.date.issued2012en_US
dc.identifier.citationFems Microbiology Ecology, 2012, v. 82 n. 2, p. 326-340en_US
dc.identifier.issn0168-6496en_US
dc.identifier.urihttp://hdl.handle.net/10722/179328-
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, either as a result of condensation processes or by direct adsorption from the vapour phase. © 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd.en_US
dc.languageengen_US
dc.publisherWiley-Blackwell Publishing Ltd.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0168-6496en_US
dc.relation.ispartofFEMS Microbiology Ecologyen_US
dc.subjectActive Layeren_US
dc.subjectAntarcticaen_US
dc.subjectDry Valleysen_US
dc.subjectMicrobial Diversityen_US
dc.subjectPermafrosten_US
dc.subjectWater Vapouren_US
dc.titleAbiotic factors influence microbial diversity in permanently cold soil horizons of a maritime-associated Antarctic Dry Valleyen_US
dc.typeArticleen_US
dc.identifier.emailPointing, SB: pointing@hkucc.hku.hken_US
dc.identifier.authorityPointing, SB=rp00771en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1111/j.1574-6941.2012.01360.xen_US
dc.identifier.pmid22428950-
dc.identifier.scopuseid_2-s2.0-84867717106en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84867717106&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume82en_US
dc.identifier.issue2en_US
dc.identifier.spage326en_US
dc.identifier.epage340en_US
dc.identifier.isiWOS:000310261900010-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridStomeo, F=24377175100en_US
dc.identifier.scopusauthoridMakhalanyane, TP=52364079500en_US
dc.identifier.scopusauthoridValverde, A=7005337772en_US
dc.identifier.scopusauthoridPointing, SB=6603986412en_US
dc.identifier.scopusauthoridStevens, MI=13606264200en_US
dc.identifier.scopusauthoridCary, CS=6603172366en_US
dc.identifier.scopusauthoridTuffin, MI=55181827500en_US
dc.identifier.scopusauthoridCowan, DA=24425600900en_US

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