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Concentrations of OA (A,B) and DTX1 (C,D) accumulated by mussels from seawater for treatments spiked with low (A,C) and high (B,D) toxin concentrations. Control: No microalgae or suspended particulate matter (SPM) added; either I. galbana or one of three different particle size-fractions of SPM (<75 µm, 75–150 µm, and 150–250 µm) were added for the treatments; red symbols indicate mean values of duplicate treatments.
