抄録
Summaries of succession of phytoplankton since 1954 in Sengari Reservoir, Hyogo Prefecture, Japan, are presented. The changes of dominant phytoplankters are associated with eutrophication of the reservoir. Between 1954 and 1964, the bacillariophytes were dominant most of the year.Afterwards the summer phytoplankton communities changed, that is, the chlorophytes were dominant between 1965 and 1972, and the cyanophytes were dominant between 1973 and 1982, although the bacillariophytes were dominant in the other seasons. Since 1984, the cyanophytes have disappeared and various species belonging to the chlorophytes, the cryptophytes, the bacillariophytes and the chrysophytes have been dominant throughout the years.
