Annual cycle of planktonic primary productivity off the Romanian Black Sea coast

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Abstract
Data are presented on planktonic primary productivity (0, 5 and 10 m depth) collected in 1982 from a station 1.2 nautical miles off Constantza on the Romanian Black Sea coast. Primary productivity was measured using the 14C technique under in situ conditions. Counting was done in a liquid scintillation spectrometer. Simultaneously, determinations of chlorophyll and microscopic enumeration of phytoplankton (density and biomass) were made. Mean values of primary productivity at 0, 5 and 10 m were 5.2, 1.4 and 1.0 mg C m-3 h-1, respectively; the water column value was 2.3 mg c m-2 h-1.

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