<国立科博専報>対馬沿岸の海藻相と海藻群落

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For the purpose of obtaining an information on the marine algal flora and the communities, both intertidal and sublittoral collections of marine algae were made at 13 localities along the coast of the Tsushima Islands in March and July, 1969. From the results of our present survey, it is found that there are 231 species of marine algae. Of these, 40 are species belonging to the Chlorophyceae, 1 to the Prasinophyceae, 60 to the Phaeophyceae, 1 to the Cyanophyceae, and the rest to the Rhodophyceae. From the viewpoint of the geographical distribution, this area has a marine flora represented in the main by temperate elements, with co-existence of a considerable number of subtropical species, such as Microdictyon japonicum, Dictyosphaeria cavernosa, Halimeda discoidea, Acetabularia mobii, Pockockiella variegata, Liagora japonica, and Bostrichia tenella. It is interesting that among four species of the algae thought by OKAMURA (1931) to be an element characteristic of the Japan Sea, the three, Ecklonia stolonifera, Coccophora langsdorfii, and Grateloupia divaricata, were not found in this area, and only Sargassum confusum was present along the northeastern part of the Islands. The vertical distribution of marine algae in the intertidal region in this coast occurs in zones as follows, in descending order : Monostroma nitidum - Porphyra suborbiculata - Gloiopeltis furcata Ishige sinicola - Ishige okamurai - Myelophycus simplex Hizikia fusiforme - Sargassum thunbergii - Corallina pilulifera Eisenia bicyclis - Sargassum spp. - Laurencia spp. It is fundamentally similar to that found in the central part of Japan facing the Pacific Ocean. However, it should be pointed out that this coast lacks in the intertidal region the Chondrus- and the Gigartina tenella-belt, both occur in common along the Pacific coast of central Japan. The vertical distribution of marine algae at Tojushi, Tsushima, in the intertidal zone is diagrammatically illustrated in Fig.4,comparing with that of the Rikuchu National Park, Sanriku Coast and Shimoda, Izu Peninsula.
国立科学博物館の論文
1970-10-20

<国立科博専報>対馬沿岸の海藻相と海藻群落

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