Abstract
Abstract Two 24-h experiments, designed to test whether the toxic dinoflagellate Alexandrium fundyense exhibited significant changes in vertical distribution, were performed in offshore waters of the Gulf of Maine in June 2000. Standard hydrocasts with a CTD/carousel water sampler package were made hourly on-station while following a drogue set at 25 m depth. Continuous measurements of T, S, and chlorophyll fluorescence were made on each down cast, and discrete water samples were collected at 5-m intervals from 55 m depth to the surface on the up cast, for analyses of extracted phytoplankton chlorophyll, inorganic nutrients and cell densities of Alexandrium In the first experiment we observed a bimodal vertical distribution of cells, with relatively high cell densities near the surface (
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