1-Introduction

Th lake vida is located in victoria valley the

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Unformatted text preview: Institute, Reno, NV 89512; bDepartment of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL 60607; cSpace Science Division, National Aeronautics and Space Administration Ames Research Center, Moffett Field, CA 94035; d Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309; eDepartment of Imaging and Applied Physics, Curtin University of Technology, Perth, WA, 6845 Australia; fDepartment of Zoology, Michigan State University, East Lansing, MI 48824-1115; gJet Propulsion Laboratory, Pasadena, CA 91109; hDepartment of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717; iDepartment of Marine Sciences, University of Georgia, Athens, GA 30602; jCentral Science Laboratory, University of Tasmania, Hobart, TAS, 7001 Australia; and kDepartment of Geological Sciences, Indiana University, IN 47405-1405 Edited by David M. Karl, University of Hawaii, Honolulu, HI, and approved October 19, 2012 (received for review May 22, 2012) The permanent ice cover of Lake Vida (Antarctica) encapsulates an extreme cryogenic brine ecosystem (−13 °C; salinity, 200). This aphotic ecosystem is anoxic and consists of a slightly acidic (pH 6.2) sodium chloride-dominated brine. Expeditions in 2005 and 2010 were conducted to investigate the biogeochemistry of Lake Vida’s brine system. A phylogenetically diverse and metabolically active Bacteria dominated microbial assemblage was observed in the brine. These bacteria live under very high levels of reduced metals, ammonia, molecular hydrogen (H2), and dissolved organic 10 and microbial processes in aphotic icy environments remains mostly unknown, however, especially at subzero temperatures. th Lake Vida is located in Victoria Valley, the northern most of the McMurdo Dry Valleys of East Antarctica (Fig. S1). Initial studies of Lake Vida’s thick ice cover described a −11.6 °C, wet, saline (estimated 245, practical salinity scale) ice at 15.8 m (10). This brine has been isolated by the thick lake ice cover and underlying 800–970 m of permafrost (11, 1...
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This note was uploaded on 03/20/2014 for the course PSYC 101 taught by Professor Catone during the Spring '07 term at CSU Fullerton.

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