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dc.contributor.authorLee, Charles Kai-Wu
dc.contributor.authorBarbier, Béatrice A.
dc.contributor.authorBottos, Eric M.
dc.contributor.authorMcDonald, Ian R.
dc.contributor.authorCary, S. Craig
dc.identifier.citationLee, C.K., Barbier, B.A., Bottos, E.M, McDonald, I.R., Cary, S.C. (2011). The inter-valley soil comparative survey: the ecology of Dry Valley edaphic microbial communities. The ISME Journal, 6, 1046–1057en_NZ
dc.description.abstractRecent applications of molecular genetics to edaphic microbial communities of the McMurdo Dry Valleys and elsewhere have rejected a long-held belief that Antarctic soils contain extremely limited microbial diversity. The Inter-Valley Soil Comparative Survey aims to elucidate the factors shaping these unique microbial communities and their biogeography by integrating molecular genetic approaches with biogeochemical analyses. Although the microbial communities of Dry Valley soils may be complex, there is little doubt that the ecosystem's food web is relatively simple, and evidence suggests that physicochemical conditions may have the dominant role in shaping microbial communities. To examine this hypothesis, bacterial communities from representative soil samples collected in four geographically disparate Dry Valleys were analyzed using molecular genetic tools, including pyrosequencing of 16S rRNA gene PCR amplicons. Results show that the four communities are structurally and phylogenetically distinct, and possess significantly different levels of diversity. Strikingly, only 2 of 214 phylotypes were found in all four valleys, challenging a widespread assumption that the microbiota of the Dry Valleys is composed of a few cosmopolitan species. Analysis of soil geochemical properties indicated that salt content, alongside altitude and Cu2+, was significantly correlated with differences in microbial communities. Our results indicate that the microbial ecology of Dry Valley soils is highly localized and that physicochemical factors potentially have major roles in shaping the microbiology of ice-free areas of Antarctica. These findings hint at links between Dry Valley glacial geomorphology and microbial ecology, and raise previously unrecognized issues related to environmental management of this unique ecosystem.en_NZ
dc.publisherNature Publishing Groupen_NZ
dc.relation.ispartofThe ISME Journal
dc.subjectDry Valleysen_NZ
dc.subjectmineral soilen_NZ
dc.titleThe inter-valley soil comparative survey: the ecology of Dry Valley edaphic microbial communitiesen_NZ
dc.typeJournal Articleen_NZ
dc.relation.isPartOfThe ISME Journalen_NZ

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