SYNOPSISThe distributton of primary pr~ction (mgC/m 3 ) and ch1orophyll-a (mg/m 3 ) t a primeira vez que se faz uma avalia,Ção da ferti1i~~e ºessas águas e sua variação espaciat e temporal, em termos de produção primária. Além do interesse puramente acadêmico, este estudo pode fornecer subsídios básicos para a determinação do potencial de produção de uma região, no que diz-respeito a organismos de níveis tróficos superiores, economicamente exploráveis.
Some aspects of the procedures to measure dissolved organic matter (DOM) released by phytoplankton account for important _sources of errors. These aspects inalude: cell damage upon filtration of samples, residual inorganic l~C in the filtrates, NaHl~C03 ampoule contaminations and the low radiation activity proper to the released samples. Some experiments on these procedural problems were carried out and their effects on the released DOM were evaluated. A procedure to use control samples to avoid errors in the technique of DOM analysis by the liquid cintillation counter is described. Experiments on the validity of stocking preserved filtrates of natural plankton populations and algal cultures were alao carried out for long periods prior to the radioactivity measurements.
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