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Fig. 31. Seasonal variation of Alexandrium catenella abundance, scallop toxicity and the toxicity of particle fractions from January to June 1990 in Tanabe Bay. (A) Vertical distribution of A. catenella. Cell density (cells L–1): (blank area) 0 to 99; (dotted line area) 100 to 999; (vertical line area) 1000 to 4999; (hatched line area) 5000 to 9999; (horizontal line area) >10000. (B) Abundance of A. catenella (filled circle) (no of cells) and scallop toxicity (open circle, MU g–1). A. catenella were collected from 1 L samples taken every 2 m from the surface to 8 m depth. Arrows: peaks of A. catenella abundance where shellfish toxicity is decreasing. (C) Toxicity of particle fractions: (open square) > 20 μm; (filled triancle) 5–20 μm; (double circle) 0.45–5 μm. Reprinted with permission from Marine Ecology Progress Series, 89, Sakamoto et al., Causative organism of paralytic shellfish toxins other than toxic dinoflagellates, 229–235, Fig. 1, © 1992, Inter-Research.

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