Distribution of Resting Cysts of Gonyaulax tamarensis var. excavata and Shellfish Toxicity

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Abstract
Our objective was to determine whether intertidal dinoflagellate resting cyst distributions might be useful for determining areas which should be closely monitored for toxins in shellfish. Gonyaulax tamarensis var. excavata cyst distributions in Gulf of Maine sediments were examined semiquantitatively each winter for a 5-yr period and compared with locations of shellfish toxicity. Although distribution patterns over broad geographical ranges may be a reflection of shellfish toxin rise, they do not predict timing of future shellfish intoxication at specific locations.

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