Lake Suwa — Eutrophication and its partial recent recovery |
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Authors: | T Okino Dr K Kato Dr |
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Institution: | (1) Suwa Hydrobiological Station, Shinshu University, 392 Suwa, Japan;(2) School of Allied Medical Sciences, Shinshu University, 390 Matsumoto, Japan |
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Abstract: | Lake Suwa, located in the center of the largest Japanese island of Honshu was a typical hypertrophic lake with a dense scum Microcystis species in summer during the 1970's. However, due to the introduction of a sewage treatment plant and the awareness of environmental pollution by local residents, a decrease in the concentration of nutrients in lake water since 1981 has been observed (from 1600 g l–1 and 160 g l–1 in 1977 to 990 g l–1 and 110 g l–1 in 1984 for total nitrogen and phosphorus respectively). |
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