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摘要

Long term monitoring on the seaweed beds were started at the six sites along the Japanese coasts. Among them, Shizugawa-site (Miyagi Pref.) and Shimoda-site (Shizuoka Pref.) have been moni-tored for 4 and 2 years respectively by the authors. Shizugawa-site is located in the cool temperate where Eisenia bicyclis is dominated, on the other hand, Shimoda-site is located in the warm temperate where Ecklonia cava is dominated. The p