Production of dissolved organic nitrogen during uptake of nitrate by Synedra planctonica: implications for estimates of new production in the oceans

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Abstract
Nitrate uptake was measured in batch cultures of the unicellular alga Synedra planctonica. During the light period, extensive excretion of dissolved organic nitrogen occurred, which represented up to 63% of nitrate uptake between 2 and 4 h into the light period. During the following dark period, most of this excreted nitrogen was taken up by dividing cells. New production can be underestimated by 50% if such a phenomenon occurs during uptake measurements restricted to the light period.

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