The intertidal zonation of marine algae along the coasts of Ago Bay, Mie Pref., which face the Pacific Ocean, was studied. The field work which forms the basis of this paper was undertaken during March, 1957 to March, 1958. As the results of the investigations, two communities were found. Gloiopeltis furcata-Myelophycus caespitosus-Hizikia fusiforme-Eisenia bicyclis community is found only at the mouth of the bay. The dominant algae of the community are Gloiopeltis furcata, Myelophycus caespitosus, Hizikia fusiforme and Eisenia bicyclis, associated with Ishige okamurai, I.foliacea, Gigartina intermedia, Hydroclathrus clathratus, Carpopeltis flabellata, Sargassum thunbergii, Colpomenia sinuosa, Sargassum hemiphyllum and S.ringgoldianum. This community shows a distinctive characteristic of the open sea. The author has found that the community is distributed over Onahama, Boso Pen., Izu Pen., Ise Bay, Matoya Bay, Hyuganada, etc. Monostroma nitidum-Scytosiphon lomentarius community was found over most of the bay. In this community there can be recognized two belts which are named after the dominant species occurring there. They are from above downward. Monostroma nitidum belt and Scytosiphon lomentarius belt. The dominant alga of the former is Monostroma nitidum associated with Enteromorpha sp. and Gelidium pusillum. The dominant alga of the latter is Scytosiphon lomentarius with Sargassum thunbergii, Hydroclathrus clathratus, Colpomenia sinuosa, Petrospongium rugosum and Sargassum patens. The community shows a distinctive characteristic of the inland sea and the community of the same kind is distributed over Mikawa Bay, Ise Bay, Tanabe Bay, the Inland Sea, Tosa Uranouchi Bay, Beppu Bay, Ariakekai and Kagoshima Bay. The important factors with regard to the distribution of the algal communities are topography of the bay and its coast-line as well as the direction of the wave action.
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