(A) Dynamics of Alexandrium (cells L−1), PSP toxins in phytoplankton concentrates (measured via receptor binding assay (RBA) and LC/MS; ng STX eq L−1) and PSP toxins adsorbed by SPATT resins HP20 and XAD-2 (measured via RBA; ng STX g−1 dry resin). Points are means, while error bars represent the standard deviation of duplicate samples. (B) PSP (µg STX eq 100 g−1) in blue mussels, hung in Woodbine (NPB8) Northport Harbor, NY, measured via mouse bioassay (MBA), and liquid chromatography mass spectrometry (LC/MS). Points represent the value of a single toxin sample analyzed from 15–20 pooled individuals.