Modern dinoflagellate cysts in hypertrophic coastal waters of Tokyo Bay, Japan |
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| Authors: | Matsuoka Kazumi; Joyce Linda B; Kotani Yuichi; Matsuyama Yukihiko |
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| Institution: | 1 Coastal Environmental Sciences, Faculty of Fisheries, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki 852-8521, Japan,
2 Heriot-Watt University (Orkney Campus), ICIT, Old Academy, Back Road, Stromness, Orkney, UK and
3 Fisheries Research Agency National Research Institute of Fisheries and Environment of Inland Sea, Harmful Algal Bloom Division, Toxic Phytoplankton Section Maruishi, Ohno, Saeki, Hiroshima 739-0452, Japan
4 Present Address: Marine and Coastal Management, Private Bag X 2, Rogge Bay, 8012, Cape Town, South Africa |
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| Abstract: | A survey of dinoflagellate resting cysts in surface sedimentsamples was carried out in Tokyo Bay, Japan, to document theirhorizontal distribution. At least 21 different cyst types werefound. Dominant cyst types allowed the recognition of assemblageswhich form three different dinoflagellate cyst communities:the innermost part of the Bay, the central area and the moutharea. In all stations in Tokyo Bay, heterotrophic dinoflagellatecysts always occupied more than half of the cyst populations.Cysts of Polykrikos schwartzii/kofoidii are the most abundantheterotrophic species. These assemblages may reflect highlynutrient-enriched (hypertrophic) and turbulent water conditions.Among the cyst types found were probable ellipsoidal cysts ofAlexandrium tamarense. This is the first record of toxic Alexandriumspecies cysts in Tokyo Bay sediments. |
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