<国立科博専報>陸中海岸国立公園の海藻相と海藻群落

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For the purpose of obtaining further information on the marine algal flora and the communities, marine algae were collected at 13 localities along the coast of the Rikuchu Scashore National Park in 1967. From the results of our survey and the data published so far, it is found that there are 217 species of marine algae. Of these, 27 are the species belonging to the Chlorophycophyta, 55 to the Phaeophycophyta, and the rest to the Rhodophycophyta. From the viewpoint of the geographical distribution, this area has the subarcitc flora as a whole, although there is co-occurrence of a considerable number of the temperate elements. It is interesting that some of the elements characteristic in the Japan Sea also grow in this area. Referring to the current system off Northeast Japan, it might be postulated that these elements are introduced to this area by the branch of the Tsushima Current from the Japan Sea through the Tsugaru Strait. The writers collected fortunately one species of Halicystis, occurrence of which has never been known in this area. The plants were discovered on rocks covered with lithothamnia in tide pools of the lowermost intertidal zone facing to the open sea at Horinai, Iwate Prefecture. The vesicles are globose to oval, being 0.5 to 0.8cm in width, and arise from a short terete stalk with rhizoidal portion, penetrating the encrusting thallus of Lithothamnium sp. Derbesia, which is considered to be the sporophytic generation of Halicystis, however, has not been found in this area. Vertical distribution of marine algae in the intertidal zone of this coast is zoned as follows, in descending order : Porphyra spp.-Gloiopeltis furcata Heterochordaris abietina-(Septifer species) Chondrus spp.-Corallina pilulifera Laminaria spp.-Undaria pinnatifida Characters of each of these zones are discussed, with reference to their relationship with the level of tide, and are compared with those of the adjacent areas. Their general appearances are also figured in text.
国立科学博物館の論文
1968-03-30

<国立科博専報>陸中海岸国立公園の海藻相と海藻群落

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