網走湖の植物プランクトンの季節的消長

概要

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The seasonal changes of phytoplankton of eutrophic and brackish Lake Abashiri in individual number and chlorophyll a concentration was investigated from May in 1978 to September in 1979. The water was also analized at the same time. The individual number and chlorophyll a concentration investigated were correlated to each other. The phytoplankton increased in spring, decreased in summer, and showed the second maximum in autumn. It was the lowest in the freezing season from December to April. Among the 97 taxa of phytoplankton identified, diatoms dominated. The dominant and other important species differed with seasons and years. In 1978, Diatoma elongatum dominated in spring, Anabaena spp. were abundant in summer, and Melosira granulata and Cyclotella glomerate. in autumn. While, in 1979, Diatoma elongatum was not so much in spring, Anabaena spp. not found in summer, but Cyclotella glomerata dominated from summer to autumn. Interrelation between the seasonal changes of phytoplankton and the environmental factors such as transparency, water temperature, salinity, pH, dissolved oxygen, phosphate and soluble inorganic nitrogen was discussed.
1980-03-28