Abstract
Organic carbon budgets for mixed cultures of lake phytoplankton indicate that [14C]CO2 uptake overestimates net particulate carbon production. The overestimate is slight (10–20%) for rapidly increasing assemblages, but ranges to severalfold for nutrient‐poor, slow‐growing cultures. A rationale is presented for estimating the yield of particulate carbon for natural assemblages from data on biomass and 14C uptake.

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