Abstract
Seaweed forests of Eisenia bicyclis Setchell and Ecklonia cava Kjellman are broadly distributed along the rocky coastal area of central Honshu Island, Japan, facing the Pacific Ocean. We aimed to clarify a process of zonation that are consisted of the two plants. We measured attaching force of holdfast of one-year old plants to the substratum in a field and fluid forces on the plants in a laboratory. Attaching forces of the holdfasts depended on a condition of substratum surface. Dominant fluid force excerted on one-year old plants was a drag force different from adult plants because of little development of stipe part. One-year old plants have attaching forces greater than the maximum fluid forces in situ estimated by the model.
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