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Biogeochemical and historical drivers of microbial community composition and structure in sediments from Mercer Subglacial Lake, West Antarctica.
Davis, Christina L; Venturelli, Ryan A; Michaud, Alexander B; Hawkings, Jon R; Achberger, Amanda M; Vick-Majors, Trista J; Rosenheim, Brad E; Dore, John E; Steigmeyer, August; Skidmore, Mark L; Barker, Joel D; Benning, Liane G; Siegfried, Matthew R; Priscu, John C; Christner, Brent C.
Afiliación
  • Davis CL; Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA.
  • Venturelli RA; Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO, USA.
  • Michaud AB; Center for Geomicrobiology, Aarhus University, Aarhus, DK, Denmark.
  • Hawkings JR; Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, USA.
  • Achberger AM; Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, USA.
  • Vick-Majors TJ; Department of Oceanography, Texas A&M University, College Station, TX, USA.
  • Rosenheim BE; Department of Biological Sciences, Michigan Technological University, Houghton, MI, USA.
  • Dore JE; College of Marine Sciences, University of South Florida, St. Petersburg, FL, USA.
  • Steigmeyer A; Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA.
  • Skidmore ML; Department of Earth Sciences, Montana State University, Bozeman, MT, USA.
  • Barker JD; Department of Earth Sciences, Montana State University, Bozeman, MT, USA.
  • Benning LG; School of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, USA.
  • Siegfried MR; GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany.
  • Priscu JC; Department of Earth Sciences, Freie Universität Berlin, Berlin, Germany.
  • Christner BC; Hydrologic Science and Engineering Program, Department of Geophysics, Colorado School of Mines, Golden, CO, USA.
ISME Commun ; 3(1): 8, 2023 Jan 30.
Article en En | MEDLINE | ID: mdl-36717625
Ice streams that flow into Ross Ice Shelf are underlain by water-saturated sediments, a dynamic hydrological system, and subglacial lakes that intermittently discharge water downstream across grounding zones of West Antarctic Ice Sheet (WAIS). A 2.06 m composite sediment profile was recently recovered from Mercer Subglacial Lake, a 15 m deep water cavity beneath a 1087 m thick portion of the Mercer Ice Stream. We examined microbial abundances, used 16S rRNA gene amplicon sequencing to assess community structures, and characterized extracellular polymeric substances (EPS) associated with distinct lithologic units in the sediments. Bacterial and archaeal communities in the surficial sediments are more abundant and diverse, with significantly different compositions from those found deeper in the sediment column. The most abundant taxa are related to chemolithoautotrophs capable of oxidizing reduced nitrogen, sulfur, and iron compounds with oxygen, nitrate, or iron. Concentrations of dissolved methane and total organic carbon together with water content in the sediments are the strongest predictors of taxon and community composition. δ¹³C values for EPS (-25 to -30‰) are consistent with the primary source of carbon for biosynthesis originating from legacy marine organic matter. Comparison of communities to those in lake sediments under an adjacent ice stream (Whillans Subglacial Lake) and near its grounding zone provide seminal evidence for a subglacial metacommunity that is biogeochemically and evolutionarily linked through ice sheet dynamics and the transport of microbes, water, and sediments beneath WAIS.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: ISME Commun Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: ISME Commun Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido