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Seawater dissolved organic matter (DOM) is the largest reservoir of exchangeable organic carbon in the ocean, comparable in quantity to atmospheric carbon dioxide. The composition, turnover times and fate of all but a few planktonic constituents of this material are, however, largely unknown. Models of ocean carbon cycling are thus limited by the need for(More)
In order to characterize the sources and ages of organic matter contributing to river and estuarine outflow waters, the present study investigated D14C and d13C signatures of the major operationally defined biochemical classes of ultrafiltered dissolved organic matter (UDOM) in conjunction with lipid biomarker and elemental compositions of UDOM and(More)
River bacterioplankton communities, influenced by watershed usage, are responsible for water purification. Bacterioplankton may be critical in the degradation of dissolved organic nitrogen (DON), the major nitrogen pool in the Caloosahatchee River, Florida. We investigated how freshwater discharge influences estuarine bacterioplankton and how the(More)
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