Occurrence of ciguatera causative fish in Japan and their expansion mechanisms

从生长在冲绳、和歌山、静冈、东京等太平洋沿海地区的大型藻类中收集了各种底栖甲藻，用于物种鉴定和克隆培养。千叶和岩手。虽然种群密度较低，但广泛分布于甘蓝和扇贝。生理特性分析表明，与热带地区的无性系相比，来自本州的无性系具有相似的最适盐度范围，但对低温(&lt；20℃)的耐性更强。这一事实对于考虑分配扩展机制是重要的。

Various benthic dinoflagellates were collected for species identification and establishment of clonal cultures from macroalgae growing in Pacific coastal areas of several prefectures such as Okinawa, Wakayama, Shizuoka, Tokyo. Chiba, and Iwate. Gambierdiscus and Ostreopsis were found from wide areas, although their population densities were low. Physiological characters analyzed using the cultures showed that clones from Honshu had similar optimum salinity range, but better tolerance to low temperature(<20 degree), comparing with those from tropical areas. This fact is important for consideration of distribution expansion mechanisms.