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dc.contributor.authorGreen, Joanna Louise
dc.description.abstractThis work focuses on the interplay between sunlight-driven and microbe-driven transformation of dissolved organic matter (DOM) from a dynamic system, the Amazon River plume. To mimic the mixing of river water with the ocean, organic matter was collected from river and low-salinity plume water, filter-sterilized, irradiated, and then inoculated with microbial communities from down-plume along the salinity gradient. Bacterial production and respiration were measured by 3H-leucine incorporation and oxygen consumption rates. The DOM was characterized spectrally via excitation-emission matrix fluorescence (EEMs) and analyzed with parallel factor (PARAFAC) analysis; generating three unique components that aligned with previous studies. Those identified as terrestrial in origin diminished with irradiation. Additions of low-salinity organic matter stimulate bacterial activity in the saltier plume, sub-plume, and oceanic water. Short-term solar exposure to this organic matter enhances the stimulatory effect further. The DOM starting material and the microbial community selected determine the rates of the carbon transformations.
dc.subjectEnvironmental Microbiology
dc.subjectAmazon River
dc.subjectRiver Plume
dc.subjectDissolved Organic Matter, PARAFAC
dc.subjectExcitation-Emission Matrix
dc.titleLinking photochemical carbon transformations and microbial responses in the Amazon River plume
dc.description.departmentMarine Sciences
dc.description.majorMarine Sciences
dc.description.advisorWilliam L. Miller
dc.description.committeeWilliam L. Miller
dc.description.committeePatricia L. Yager
dc.description.committeeMary Ann Moran

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