Diversity and potential sources of microbiota associated with snow on western portions of the Greenland ice sheet

Authors Organisations
  • Karen Cameron(Author)
  • Birgit Hagedorn(Author)
    University of Alaska Anchorage
  • Markus Dieser(Author)
    Louisiana State University
  • Brent C. Christner(Author)
    Louisiana State University
  • Kyla Choquette(Author)
    University of Alaska Anchorage
  • Ronald Sletten(Author)
    University of Washington
  • Byron Crump(Author)
    Oregon State University
  • Colleen Kellogg(Author)
    Oregon State University
  • Karen Junge(Author)
    University of Washington
Type Article
Original languageEnglish
Pages (from-to)594-609
JournalEnvironmental Microbiology
Volume17
Issue number3
Early online date05 Mar 2014
DOI
Publication statusE-pub ahead of print - 05 Mar 2014
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Abstract

Snow overlays the majority of the Greenland Ice Sheet (GrIS). However, there is very little information available on the microbiological assemblages that are associated with this vast and climate-sensitive landscape. In this study, the structure and diversity of snow microbial assemblages from two regions of the western GrIS ice margin were investigated through the sequencing of small subunit ribosomal RNA genes. The origins of the microbiota were investigated by examining correlations to molecular data obtained from marine, soil, freshwater and atmospheric environments and geochemical analytes measured in the snow. Snow was found to contain a diverse assemblage of bacteria (Alphaproteobacteria, Betaproteobacteria and Gammaproteobacteria) and eukarya (Alveolata, Fungi, Stramenopiles and Chloroplastida). Phylotypes related to archaeal Thaumarchaeota and Euryarchaeota phyla were also identified. The snow microbial assemblages were more similar to communities characterized in soil than to those documented in marine ecosystems. Despite this, the chemical composition of snow samples was consistent with a marine contribution, and strong correlations existed between bacterial beta diversity and the concentration of Na(+) and Cl(-) . These results suggest that surface snow from western regions of Greenland contains exogenous microbiota that were likely aerosolized from more distant soil sources, transported in the atmosphere and co-precipitated with the snow.