瀬戸内海の環境の30年間の変化 : 水産の環境モニタリング"浅海定線観測調査"のとりまとめ

概要

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Long-term variations in water temperature, salinity, transparency, and nutrient and dissolved oxygen concentrations in the whole area of the Seto Inland Sea of Japan were examined using data from a fisheries monitoring program conducted from 1973 to 2002. After 1989/1990, water temperature at 10m depth generally remained at a higher level than in the 1980s. This trend was recognized noticeably in winter, suggesting that the water temperature fluctuations in the Seto Inland Sea were differed seasonally. Transparency generally remained at a high level after the late 1980s. On the other hand, phosphate concentration at the surface dramatically decreased in the late 1970s, probably in reflection of the Areawide Total Pollutant Load Control System, and generally continued to be flat thereafter. Patterns of variation in concentration of dissolved inorganic nitrogen at the surface and dissolved oxygen at the bottom were similar to that of phosphate concentration throughout the viewpoint of the whole area of the Seto Inland Sea.
日本ベントス学会の論文
2007-07-25