Distribution and Diversity of Microorganisms of Deep, Subpermafrost Brine in the Canadian Arctic

Details Distribution and Diversity of Microorganisms of Deep, Subpermafrost Brine in the Canadian Arctic Distribution and Diversity of Microorganisms of Deep, Subpermafrost Brine in the Canadian Arctic

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p51d0955b&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P51D-0955

Biology

0448 Geomicrobiology, 0456 Life In Extreme Environments, 0702 Permafrost (0475), 5430 Interiors (8147), 6225 Mars

Scientific paper

Saline fracture water (0.3 to 3.7% TDS) trapped beneath 500 meters of frozen Archean metasediment was collected from boreholes at 880 and 1130 meters depth at Lupin Au mine. Temperatures range from 4 to 10oC, pH from 8 to 9, Eh from -150 to -190 mV. H2 and CH4 gas concentration range from 20 to 600 nM and 6 to 55 mM, respectively. The cell density ranged from 400 to 105 cells/ml by direct count. Significant hydrogenase activity was detected only in the borehole containing the highest cell density and lowest salinity. This activity was associated with relatively low H2 and high CO concentrations. The microbial diversity of fracture water yielding the lowest concentration of CH4 and the greatest 34S fractionation between sulfate and sulfide (10o/oo) was characterized using the 16S rDNA gene. The cDNA revealed a predominance of a species that was 95-97% similar Thiohalobaccili and the presence of a species that was 96% similar to Desulfosporosinus. No archaeal PCR product was detected. The molecular, geochemical and isotopic data suggest cycling of S is occurring under suboxic conditions beneath the permafrost. He concentrations suggest that this environment has been isolated from the surface for a geologically significant time interval. The persistence of suboxic conditions in this sequestered ecosystem is either caused by a lack of electron donors relative to electron acceptors or mixing with surficial lake water through nearby taliks.

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