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Northeast PSP New England Harmful Algal Bloom / Red Tide Information
Maps of the Gulf of Maine reveal the concentration of Alexandrium cysts buried in seafloor sediments, as detected by WHOI-led surveys in the fall of 1997, 2004, 2005, 2006, and 2007. The abundance of cysts laid down at the end of one year is believed to be a strong indicator of the severity of the bloom the next year. (Graphic by Donald M. Anderson et al, Woods Hole Oceanographic Institution)