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To investigate the possibility that continued phytoplantkon growth in the summer depends on ammonium excretion by microzooplankton, rates of NH<sup>+</sup><sub>4</sub> regeneration and assimilation were measured by a <sup>15</sup>N isotope dilution method. Daytime regeneration rates at 0-2 m depth were 0-28% of the calculated assimilation rates at ambient NH<sup>+</sup><sub>4</sub> concentrations. 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