汽水産有孔蟲類の研究 : VI.中海の有孔蟲類
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The present note on the Foraminifera of Nakanoumi, a lake, situated on the coast facing the Japan Sea, is the fourth report on the brackish water foraminifera of Japan. Nakanoumi having two islands is a lagoon connected narrowly with Miho Bay by the spit, Yomigahama, and barely with Lake Sinzi by a channel. Its area is about 100 km^2 and its greatest depth 9 m. Sand contents of muddy deposits in it vary between 9%-28%. Salinity of bottom water of the lagoon is nearly equal to that of surface water of Miho Bay. Collections of the Foraminifera in the lagoon were made at four stations shown in the figure. Volume of the tests of the Foraminifera, selected from deposits per litter by means of the carbone tetrachloride method, was 0.6cc, 3.5cc, 0.7cc, and 0.4cc respectively at Sts. I, II, III, and IV. In all 32 forms of Foraminifera were observed in the material obtained at the four stations. 30 forms were found from St. IV, but only three species were collected at St. II. From three stations, I, II, and III, distributed in the area south to the two islands, a small number of species of Foraminifera were found, some of them being adapted to brackish water, such as Haplophragmoides canariensis (d'ORBIGNY), Trochammina globigeriniformis (PARKER & JONES), and Rotalia beccarii (LINNE). All these species occur in abundance, T. globigeriniformis being especially numerous at St. II. Many species detected form St. IV, stuated north to the islands, also occur in Miho Bay. It was impossible to find out marked differences in the frequency of occurrence of each species. Regarding the Foraminfera, the area of Nakanoumi can be divided by the two islands into a brackish and a seawater region; in the latter Eliphidium advenum (CUSHMAN) and several species of Miliolidae are comparatively predominant. The Foraminifera of Nakanoumi generally consist of only warm water forms.
- 社団法人日本動物学会の論文
- 1939-03-15
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