The biogeochemistry of the stable isotopes of carbon in a marine bay

Mathematics – Logic

Scientific paper

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Scientific paper

The most abundant biological samples from Redfish Bay, a shallow marine estuary near Port Aransas, Texas, were collected, and C 13 for the total carbon, lipid carbon, and protein-carbohydrate carbon was measured. Some member of the community had an isotopic composition corresponding to every unit value of C 13 between -6 and -17. C 13 was found to be constant for different individuals of the same species to ±1/mil. The pure fatty acids or lipids, or both, were found to be from 0.5 to 15/mil "lighter" than the total carbon of the organism that contained them. The organic matter of the sediment could have been supplied by the community according to the carbon-isotope data. A 5/mil diurnal variation in C 13 of the inorganic carbon of the sea water of a simple marine community was observed.

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