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dc.contributor.authorForeman, Christine M.
dc.contributor.authorCory, R. M.
dc.contributor.authorMorris, Cindy E.
dc.contributor.authorSanClements, M. D.
dc.contributor.authorSmith, Heidi J.
dc.contributor.authorLisle, John T.
dc.contributor.authorMiller, P. L.
dc.contributor.authorChin, Yu-Ping
dc.contributor.authorMcKnight, Diane M.
dc.identifier.citationForeman CM, Cory RM, Morris CE, SanClements MD, Smith HJ, Lisle JT, Miller PL, Chin Y-P, McKnight DM, "Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica," Environmental Research Letters. July 2013 8(3): 1-11en_US
dc.description.abstractDuring the austral summers of 2004 and 2009, we sampled a supraglacial stream on the Cotton Glacier, Antarctica. The stream dissolved organic matter (DOM) was low (44–48 µ M C) and lacked detectable humic fluorescence signatures. Analysis of the excitation emissions matrices (EEMs) indicated that amino-acid fluorophores dominated, consistent with DOM of microbial origin, with little humic-like fluorescence. In most aquatic ecosystems, humic DOM attenuates harmful UV radiation and its absence may represent an additional stressor influencing the microbial community. Nonetheless, the stream contained an active microbial assemblage with bacterial cell abundances from 2.94 x 104 to 4.97 x 105 cells ml-1, and bacterial production ranging from 58.8 to 293.2 ng C l-1 d-1. Chlorophyll-a concentrations ranged from 0.3 to 0.53 µ g 1-1 indicating that algal phototrophs were the probable source of the DOM. Microbial isolates produced a rainbow of pigment colors, suggesting adaptation to stress, and were similar to those from other cryogenic systems (Proteobacteria and Bacteroidetes lineages). Supraglacial streams provide an example of contemporary microbial processes on the glacier surface and a natural laboratory for studying microbial adaptation to the absence of humics.en_US
dc.titleMicrobial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarcticaen_US
mus.citation.journaltitleEnvironmental Research Lettersen_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemistry & Biochemistry.en_US
mus.relation.departmentMicrobiology & Immunology.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.contributor.orcidForeman, Christine M.|0000-0003-0230-4692en_US

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