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- W1990556781 abstract "Measurements of microbial utilization of extracellular organic carbon (EOC) released by phytoplankton commonly consider only EOC fractions subject to rapid uptake. Questions remain whether other EOC fractions are metabolized, what portion is labile, and with what assimilation efficiency this carbon substrate is utilized. 14C-EOC was prepared by incubation of the natural mixed planktonic community from an oligotrophic lake with H14CO3 in the light. 14C-EOC which was not rapidly removed by heterotrophs remained in solution and was isolated by filtration. This residual EOC was inoculated with lake microheterotrophs in laboratory microcosms, and utilization kinetics were determined through long-term assays of cumulative 14CO2 production. Time-courses for 14CO2 production were consistent for all assays and were well described by a deterministic mixed-order degradation model. On twelve sampling occasions, from 29% to 76% of residual 14C-EOC was labile to further metabolism by lake heterotrophs. First-order rate constants for EOC utilization showed a mode of 0.05 to 0.15 per day. From 33% to 78% of gross 14C-EOC uptake was respired (mean 50%), indicating appreciable return of algal EOC to the pelagic food web as microbial biomass." @default.
- W1990556781 created "2016-06-24" @default.
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- W1990556781 date "1989-03-01" @default.
- W1990556781 modified "2023-10-16" @default.
- W1990556781 title "Bacterial metabolism of algal extracellular carbon" @default.
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- W1990556781 doi "https://doi.org/10.1007/bf00015524" @default.
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