Size Fractionation of Metabolically Active Phytoplankton and Bacteria in Two Diverse Lentic Systems

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Simultaneous size fractionation of plankton populations associated with NaH^14CO_3 and ^3H-glucose uptake was employed in eutrophic Lake Texoma (Texas and Oklahoma) and oligotrophic Flathead Lake (Montana). Autoradiography was utilized to determine the role of specific microorganisms in community metabolism. Ultraplankton (0.45-10 μm) dominated plankton numbers and metabolic activity in both aquatic systems. Many of the most abundant species were not the most productive, in terms of inorganic C fixation. Rates of heterotrophic uptake of ^3H-glucose were small in comparison to photolithotrophic uptake in both lakes, Photoheterotrophy was more extensive in Flathead Lake, Autoradiographs indicated that bacteria were responsible for observed ... continued below

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vii, 183 leaves : ill.

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Ellis, Bonnie K. August 1980.

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  • Ellis, Bonnie K.

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Simultaneous size fractionation of plankton populations associated with NaH^14CO_3 and ^3H-glucose uptake was employed in eutrophic Lake Texoma (Texas and Oklahoma) and oligotrophic Flathead Lake (Montana). Autoradiography was utilized to determine the role of specific microorganisms in community metabolism. Ultraplankton (0.45-10 μm) dominated plankton numbers and metabolic activity in both aquatic systems. Many of the most abundant species were not the most productive, in terms of inorganic C fixation. Rates of heterotrophic uptake of ^3H-glucose were small in comparison to photolithotrophic uptake in both lakes, Photoheterotrophy was more extensive in Flathead Lake, Autoradiographs indicated that bacteria were responsible for observed photoheterotrophy. Oscillatoria sp. exhibited. mixotrophy in Lake Texoma,

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vii, 183 leaves : ill.

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  • August 1980

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Ellis, Bonnie K. Size Fractionation of Metabolically Active Phytoplankton and Bacteria in Two Diverse Lentic Systems, thesis, August 1980; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc504629/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .