Occurrence of toxic <Emphasis Type="Italic">Dinophysis acuminata</Emphasis> (Dinophyceae) in Uranouchi Inlet,Japan |
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Authors: | Masao Adachi Naoko Okamoto Masayuki Matsubara Toshitaka Nishijima Toshiyuki Suzuki |
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Institution: | (1) Laboratory of Aquatic Environmental Science, Faculty of Agriculture, Kochi University, 783-8502 Nankoku, Kochi, Japan;(2) National Research Institute of Fisheries Science, 236-8648 Kanazawa, Yokohama, Japan;(3) Present address: Martiha Nichiro Co, 100-0006 Chiyoda-ku, Tokyo, Japan;(4) Present address: Katokichi Co., Ltd., 768-8501 Kannonji, Kagawa, Japan |
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Abstract: | In the Uranouchi Inlet, which has a commercial fishery of littleneck clam Ruditapes philippinarum, potentially toxigenic species of Dinophysis acuminata showed an annual occurrence except for the summer of 2000–2002. Relatively high abundances of D. acuminata were observed in April 2000 and November 2002. Some samples of D. acuminata cells, which were collected from the inlet in autumn 2002, contained pectenotoxin-2 (0.9–2.8 pg/cell) and okadaic acid (1.9–2.8
pg/cell). Cell length and hypotheca width of D. acuminata found in the Uranouchi Inlet were 33.7–45.0 and 21.0–31.6 μm, respectively. The length-width ratios ranged 1.21–1.71. Sequences
of the 5.8S ribosomal RNA gene and flanking internal transcribed spacers, 1 and 2 of cells of D. acuminata from the inlet fell into a D. acuminata complex clade that included, D. acuminata-D. sacculus-D. acuta reported by others. In the inlet, occurrences of D. acuminata were detected within a broad water temperature range between 13.0 and 26.9°C, and those showing more than 25 cells/L were
within 16.4–17.3°C for temperature and 27.6 and 34.1 for salinity. This is the first report that cells of Dinophysis acuminata from southern Japanese coastal waters contained okadaic acid and pectenotoxin-2. |
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Keywords: | dinoflagellate Dinophysis acuminata DSP ITS okadaic acid pectenotoxin-2 phylogenetic analysis |
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