瀬戸内海主要海域の生物学的富栄養階級図

概要

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The map of biological classification of eutrophic level in several areas of the Inland Sea of Seto was made to illustrate a difference of the water quality in these areas, using phytoplankton indicator system proposed by the authors. The data on phytoplankton in Osaka Bay, Harima Nada, Hiuchi Nada, Hiroshima Bay, and Suho Nada and its adjacent areas were mainly quoted from the report on " Investigation on the forecasting of red tide in the Inland Sea of Seto in 1978 ". In the areas studied, it was found to be classified in four eutrophic regions, such as the region between oligotrophic and eutrophic ones, the eutrophic region, the region between eutrophic and extremely eutrophic ones, and the extremely eutrophic region. The coast of Hiuchi Nada alone was illustrated as the region between oligotrophic and eutrophic ones. The largest parts in these areas were illustrated as the eutrophic region. The inner parts of Osaka Bay and Hiroshima Bay, the inshore part near Hofu City in Suho Nada, and Dokai Bay were illustrated as the extremely eutrophic region. These results indicated that the water quality on biological condition in these areas studied was comparable to or more eutrophic than that of Harima Nada where the red tide consisting of Chattonella sp. often occurred.
日本水産學會の論文