How have the ecological cycles of Japan’s Lake Biwa been so well preserved over the centuries?



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    “Lake Biwa Day” refers to July 1, 1982 when the Japanese government passed legislation to prevent the eutrophication of the lake.  They did this by regulating the nutrient levels entering the lake from agriculture, industry, and households. Large colonies of reeds on the shores of the lake act as a purification system for the lake, and are protected by the Shiga Ordinance for the Conservation of Reed Vegetation Zones passed in the early 90’s. In essence, the fragile ecosystems of Lake Biwa have been preserved through good conservation techniques by the Japanese government and cooperation from fisherman and surrounding communities. This allows the lake to be home to 595 animal species and 491 plant species.

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