2018年08月16日

'Marimo' round green alga that lives in Lake Akan in Hokkaido is designated as a special natural treasure of Japan.

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Marimo, a kind of freshwater alga, generally lives on rocks or pebbles as a form of filament. Marimo in Lake Akan, however, forms a beautiful spherical shape made up of many filaments. Round-shaped marimo also can be found in the several other lakes in Japan as well as some other lakes in the Northern Hemisphere though, Lake Akan's marimo is the largest with a diameter of 30 cm on average. As shown in the picture, the shape of them is very well proportioned, which is unlike any other in the world. This lake is world's largest growing area of marimo. How the filamentous alga grow into spherical shape is uncertain, but the rough waves caused by strong winds seem to rock the marimo on the lakebed gently to transform them from filament to ball. Big marimo over 35 cm in diameter finally fall apart as it is hollow. Then, the small pieces start to grow again into baby marimos.

Licensed tour guide/travel consultant,
Masahisa Takaki.

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posted by masahisa at 16:29 | Hokkaido | このブログの読者になる | 更新情報をチェックする