Phytoplankton - USGS
marine life in the Gulf of the Farallones would be impossible. Phytoplankton provide food for a ... and (2) centric diatoms, which evolved later than the pennates, are shaped like pillboxes and ... nearly all incidents of paralytic shellfish poisoning (PSP) toxicity in shellfish have occurred in the absence of visible blooms of toxin-producing ...
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