Debris-Rich Basal Ice as a Microbial Habitat, Taylor Glacier

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TitleDebris-Rich Basal Ice as a Microbial Habitat, Taylor Glacier, AntarcticaAbstractTwo ~4 m vertical sequences of basal ice were collected from tunnels dug into the northern lateral margin of Taylor Glacier, McMurdo Dry Valleys, Antarctica. In both cases the basal sequences exhibit two contrasting ice facies groups; clean (debris-free) and banded dispersed (debris-rich). Debris-rich ices exhibit elevated CO2 and depleted O2 concentrations compared to the clean facies. Bacterial cell numbers, respiration rates, and nutrient concentrations are highest in debris-rich layers. Together, our geochemical and biological data indicate that microbial heterotrophic respiration is likely occurring in situ within the basal ice matrix at ambient temperatures near -15^circC. This implies that the basal ice zone of polar glaciers and larger ice sheets is a viable subglacial microbial habitat and active biome of significant volume that has not previously been considered. © 2014 Copyright Taylor and Francis Group, LLC.Funding Details0654336, DGE, Division of Graduate Education; Geological Society of America; 0654336, NSF, National Science Foundation

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1st AuthorMontross, S.AuthorMontross, S.Skidmore, M.Christner, B.Samyn, D.Tison, J.-L.Lorrain, R.Doyle, S.Fitzsimons, S.Year2014JournalGeomicrobiology JournalVolume31Number1Pages76-81DOI10.1080/01490451.2013.811316URLhttps://www.scopus.com/inward/recor.....363b74cb8292f1ab64a8b9da9Keywordsbasal icebiogeochemical cyclecarbon dioxideconcentration (composition)ice sheetmicrobiologynutrientoxygenrespirationsediment, AntarcticaEast AntarcticaMcMurdo Dry ValleysTaylor Glacier, rank3Author Keywordsbiogeochemical cyclingsedimentssubsurface microbiology

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TypeArticleCitationMontross, S., Skidmore, M., Christner, B., Samyn, D., Tison, J.-L., Lorrain, R., Doyle, S. and Fitzsimons, S. (2014). Debris-Rich Basal Ice as a Microbial Habitat, Taylor Glacier, Antarctica. Geomicrobiology Journal, 31(1): 76-81 doi:10.1080/01490451.2013.811316