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dc.contributor.authorSmith, Heidi J.
dc.contributor.authorFoster, Rachel A.
dc.contributor.authorMcKnight, Diane M.
dc.contributor.authorLisle, John T.
dc.contributor.authorLittmann, Sten
dc.contributor.authorKuypers, Marcel M. M.
dc.contributor.authorForeman, Christine M.
dc.date.accessioned2017-06-16T18:10:18Z
dc.date.available2017-06-16T18:10:18Z
dc.date.issued2017-04
dc.identifier.citationSmith HJ, Foster RA, McKnight DM, Lisle JT, Littmann S, Kuypers MMM, et al. Microbial formation of labile organic carbon in Antarctic glacial environments. Nature Geoscience; 2017 April 3;10(5):356–9.en_US
dc.identifier.issn1752-0894
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/13063
dc.description.abstractRoughly six petagrams of organic carbon are stored within ice worldwide. This organic carbon is thought to be of old age and highly bioavailable. Along with storage of ancient and new atmospherically deposited organic carbon, microorganisms may contribute substantially to the glacial organic carbon pool. Models of glacial microbial carbon cycling vary from net respiration to net carbon fixation. Supraglacial streams have not been considered in models although they are amongst the largest ecosystems on most glaciers and are inhabited by diverse microbial communities. Here we investigate the biogeochemical sequence of organic carbon production and uptake in an Antarctic supraglacial stream in the McMurdo Dry Valleys using nanometre-scale secondary ion mass spectrometry, fluorescence spectroscopy, stable isotope analysis and incubation experiments. We find that heterotrophic production relies on highly labile organic carbon freshly derived from photosynthetic bacteria rather than legacy organic carbon. Exudates from primary production were utilized by heterotrophs within 24 h, and supported bacterial growth demands. The tight coupling of microbially released organic carbon and rapid uptake by heterotrophs suggests a dynamic local carbon cycle. Moreover, as temperatures increase there is the potential for positive feedback between glacial melt and microbial transformations of organic carbon.en_US
dc.titleMicrobial formation of labile organic carbon in Antarctic glacial environmentsen_US
dc.typeArticleen_US
mus.citation.extentfirstpage356en_US
mus.citation.extentlastpage359en_US
mus.citation.issue5en_US
mus.citation.journaltitleNature Geoscienceen_US
mus.citation.volume10en_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.doi10.1038/ngeo2925en_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.collegeCollege of Agriculture
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.data.thumbpage4en_US


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