Effect of temperature and salinity on the growth of four harmful red tide flagellates occurring in Isahaya Bay in Ariake Sound, Japan
2006
Yamatogi, T.(Nagasaki-ken. Inst. of Fisheries (Japan)) | Sakaguchi, M. | Iwataki, M. | Matsuoka, K.
Three harmful red tide causative raphidophytes Chattonella antiqua (Hada) Ono, Chattonella marina (Subrahmanyan) Hara et Chihara and Heterosigma akashiwo Hada, and a dinoflagellate Cochlodinium polykrikoides Margalef were isolated from Isahaya Bay, Japan in 2003-2004. The growth characteristics of these four clonal cultures were examined in 60 different combinations of temperature (10-32.5 deg C) and salinity (16-36) under a light intensity of 80 mu mol/m(2)/s. C. antiqua reproduced at 15-32.5 deg C and 16-36 PSU, and the maximum growth rate was 0.99 day(-1) at 30 deg C and 32 PSU. C. marina reproduced at 12.5-32.5 deg C and 16-36 PSU. The maximum growth rate was 0.83 day(-1), which was obtained at 30 deg C and 24 PSU. H. ahashiwo reproduced at 10-32.5 deg C and 16-36 PSU. The maximum growih rate was 1.14 day(-1) at 25 deg C and 24 PSU. C. polykrikoides reproduced at 10-32.5 deg C and 1636 PSU. The maximum growth rate was 0.56 day(-1) at 27.5 deg C and 32 PSU. Four red tide flagellates examined in this study appeared to be euryhaline. The optimum temperatures for maximum growth were different in each species and these conditions clearly corresponded with recent red tide occurrences in Isahaya Bay. Compared with growth conditions previously reported, four isolates from Isahaya Bay are likely to tolerate relatively higher temperature.
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