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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 8 | PAGES 1167-1174 | 1997
© Oxford University Press

research-article

Effects of temperature and salinity on the growth of the red tide flagellates Heterocapsa circularisquama (Dinophyceae) and Chattonella verruculosa (Raphidophyceae)

Mineo Yamaguchi, Itakura Shigeru, Keizo Nagasaki, Yukihiko Matsuyama, Takuji Uchida and Ichiro Imai1

Nansei National Fisheries Research Institute Ohno, Saeki, Hiroshima 739–04, Japan 1Faculty of Agriculture, Kyoto University Sakyo, Kyoto 606-01, Japan

Received on December 17, 1996; accepted on April 15, 1997 Growth responses of the red tide flagellates, Heterocapsa circularisquama (Dinophyceae) and Chattonella verruculosa (Raphidophyceae), were examined with 36 different combinations of temperature (5–30°C) and salinity (10–35 PSU). Heterocapsa circularisquama did not grow at or below a temperature of 10°C. The maximum growth rate of H.circularisquama (1.3 divisions day–1) was obtained with a combination of 30°C and 30 PSU. In contrast, C. verruculosa did not grow at 10 PSU and at temperatures of 25°C or more. The maximum growth rate of C. verruculosa (1.74 divisions day–1) was obtained with a combination of 15°C and 25 PSU. A significant temperature-salinity interaction on growth was found by factorial analysis. Based on the physiological characteristics obtained in the present study, these novel flagellates have a potential for future outbreaks of red tides in pre viously unaffected waters.


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