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dc.contributor.authorSchmidt, Marie
dc.date.accessioned2020-10-01T23:49:03Z
dc.date.available2020-10-01T23:49:03Z
dc.date.issued2020-05
dc.identifier.urihttp://hdl.handle.net/11122/11287
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2020en_US
dc.description.abstractIn the boreal forest, permafrost thaw is resulting in changes in vegetation and deepening of watershed flowpaths. Caribou-Poker Creeks Research Watershed contains sub-catchments underlain with varying permafrost extents (4-53% cover), providing the opportunity to study how permafrost extent affects water chemistry and nutrient cycling. I measured nitrogen (N), phosphorous (P), and carbon (C) processing ectoenzyme activity in the water column and sediment of headwater streams, and related ectoenzyme activity to nutrient and dissolved organic carbon (DOC) concentration. Additionally, I used nutrient diffusing substrata (NDS) to grow biofilms with enhanced inorganic N and P and labile C alone and in combination and measured ectoenzyme activity and respiration of biofilms in response to resource amendments. High P-processing enzyme activity across streams of the CPCRW indicated microbial P limitation. Respiration and organic matter processing enzymes of biofilms grown on NDS increased with labile C or labile C in combination with nutrient additions, implying that labile C limited or co-limited rates of DOM processing. Our results suggest that as climate warming and subsequent permafrost thaw alters terrestrial inputs of dissolved organic matter (DOM) and inorganic nutrients into streams, changes in inorganic P and labile C availability will control microbial processing of DOM.en_US
dc.description.sponsorshipBonanza Creek Long Term Ecological Research program (NSF grant DEB-1636476)en_US
dc.description.tableofcontentsChapter 1: General introduction -- Chapter 2: Control on microbial processing of dissolved organic matter in boreal forest streams -- Chapter 3: General Conclusion.en_US
dc.language.isoen_USen_US
dc.subjectwateren_US
dc.subjectorganic compoundsen_US
dc.subjectAlaskaen_US
dc.subjectInterior Alaskaen_US
dc.subjectpermafrosten_US
dc.subjectTaiga ecologyen_US
dc.subjectpermafrost forest ecologyen_US
dc.subjectextracellular enzymesen_US
dc.subjectmicrobial ecologyen_US
dc.titleControls on microbial processing of dissolved organic matter in boreal forest streamsen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Biology and Wildlifeen_US
dc.contributor.chairJones, Jay
dc.contributor.committeeHarms, Tamara
dc.contributor.committeeGuerard, Jennifer
refterms.dateFOA2020-10-01T23:49:04Z


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