西部瀬戸内海におけるGymnodinium nagasakienseの初期出現域とその環境特性

概要

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Dinophyte Gymnodinium nagasakiense Takayama et Adachi is one of the prodigeous red tide flagellates in western Japan and southern Korea. In order to identify the areas where red tides of G. nagasakiense are likely to occur and to elucidate its environmental features, cell numbers of the organism, water temperature, salinity and dissolved oxygen were monitored weekly in Suo-Nada and Iyo-Nada during May to August, 1989. In this investigation, we found that the initial appearance of G. nagasakiense occurred in the western and southern coastal waters of Suo-Nada of which environmental condition were characterized by high water temperature, low salinity and distribution of oxygen-deficient water in the bottom layer. Further, the biological and oceanographic data implied that the population growth was related to the formation of pycnocline and the expansion of distribution resulted in the overturn of stratification.
日本水産學會の論文