Radiocarbon in marine bacteria: evidence for the ages of assimilated carbon

Article Abstract:

Relative proportions of modern and older dissolved organic carbon (DOC) used by open-ocean and estuarine marine bacteria have been studied. Marine bacteria usually use recently produced components of bulk dissolved organic matter. Bacterial nucleic acids from Santa Rosa Sound, FL, were significantly higher in radiocarbon relative to the bulk DOC and similar to the radiocarbon signature of atmospheric carbon dioxide at sampling time. From the ocean site, bacterial nucleic acids were higher in (super.14)C relative to bulk DOC, but low in (super.14)C relative to modern surface-dissolved inorganic carbon and suspended particulate organic carbon. This suggests open-ocean bacteria assimilate modern and older DOC components.

Usage, Radiocarbon dating, Carbon cycle (Biogeochemistry), Carbon cycle

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Stable isotope evidence for alternative bacterial carbon sources in the Gulf of Mexico

Article Abstract:

The article explores the stable carbon isotope analysis to examine bacterial role in carbon cycles in different aquatic ecosystems. The evidence that carbon may be seasonally uncoupled to surface phytoplankton production is presented.

Statistical Data Included, Analysis, Food chains (Ecology), Food chains, Nitrogen, Phytoplankton, Sea-water, Seawater, Nitrogen isotopes

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A mass- and isotope-balance model of DOC mixing in estuaries

Article Abstract:

The article discusses the impact of dissolved organic carbon (DOC) on estuarine carbon cycles. Information derived from property-salinity diagrams of DOC and its stable isotope is presented.

Chemical reaction, Rate of, Chemical kinetics, Estuaries

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