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Map of the U.S. showing 9 ecoregions and distribution and relative biovolume (μm3 L−1) of common potentially toxigenic cyanobacterial genera in samples from the 2012 NLA. A)Aphanizomenon spp. B) Cylindrospermopsis spp. C) Dolichospermum spp. D) Microcystis spp. E) Planktothrix spp
