Relationship between dissolved organic matter quality and microbial community composition across polar glacial environments

FEMS Microbiology Ecology
Heidi J SmithChristine M Foreman

Abstract

Vast expanses of Earth's surface are covered by ice, with microorganisms in these systems affecting local and global biogeochemical cycles. We examined microbial assemblages from habitats fed by glacial meltwater within the McMurdo Dry Valleys, Antarctica and on the west Greenland Ice Sheet (GrIS), evaluating potential physicochemical factors explaining trends in community structure. Microbial assemblages present in the different Antarctic dry valley habitats were dominated by Sphingobacteria andFlavobacteria, while Gammaproteobacteria and Sphingobacteria prevailed in west GrIS supraglacial environments. Microbial assemblages clustered by location (Canada Glacier, Cotton Glacier and west GrIS) and were separated by habitat type (i.e. ice, cryoconite holes, supraglacial lakes, sediment and stream water). Community dissimilarities were strongly correlated with dissolved organic matter (DOM) quality. Microbial meltwater assemblages were most closely associated with different protein-like components of the DOM pool. Microbes in environments with mineral particles (i.e. stream sediments and cryoconite holes) were linked to DOM containing more humic-like fluorescence. Our results demonstrate the establishment of distinct microbial co...Continue Reading

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Citations

Jul 17, 2018·FEMS Microbiology Ecology·Marek StibalMax M Häggblom
Jul 25, 2019·Frontiers in Microbiology·Miranda Jane NicholesAlexandre Anesio
May 17, 2021·Molecular Ecology·Dandan Izabel-ShenFrancisco J A Nascimento

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