NITRATE REDUCTASE ACTIVITY DURING A DINOFLAGELLATE BLOOM1

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<jats:p>Phytoplankton nitrate reductase activity in the Pamlico River estuary, North Carolina, paralleled the development of a winter dinoflagellate bloom. High enzyme activity was associated not only with high algal biomass, primarily of <jats:italic>Peridinium triquetrum,</jats:italic> but also with low nitrate concentrations in the typically nitrate‐rich waters. Nitrate was an important source of nitrogen for the bloom organisms in spite of the abundance of ammonium. The initiation and cessation of nitrate assimilation seemed closely related to the appearance and disappearance of the bloom. Although nitrate metabolism may be an important factor in bloom timing, temperature, salinity, and flushing of the system are also involved.</jats:p>

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