内海性浅海域の生物とその生態的機能を探る　　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―

DOI Web Site 被引用文献14件 参考文献11件
  • 樽谷 賢治
    独立行政法人水産総合研究センター瀬戸内海区水産研究所

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タイトル別名
  • Long-term Variations in Water Environments in the Seo Inland Sea of Japan during 1973 to 2002 Based on Data from the Fisheries Monitoring Program
  • セトナイカイ ノ カンキョウ ノ 30ネンカン ノ ヘンカ スイサン ノ カンキョウ モニタリング センカイ テイセン カンソク チョウサ ノ トリマトメ

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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.

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