鈴鹿山脈の淡水産プラナリアの生態調査報告

概要

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The vertical distribution of freshwater planarians in the Suzuka Mountains and the adjacent district in the north-eastern part of the Kinki Region in Honshu(Lat. 34°45′N. to Lat. 35°30′N. and Long. 136°10′E. to Long. 136°40′E.)is reported. The Suzuka Mountains bestride on the boundary between Shiga Prefecture and Mie Prefecture(the south-east of Lake Biwa-ko) ; most of the mountains are over 1000 metres in elevation(the highest peak, Mt. Amagoi-dake, is 1238 metres above sea level). Mt. Ibuki, 1377 metres high, is situated north-east of Lake Biwa-ko. The main river systems in the eastern part of the area surveyed are the Makita, Machiya, Asake, Mitaki, Utsube and the Susuka. They discharge into Ise Bay facing the Pacific Ocean. The river systems in the western part of the area surveyed(the Amano, Echi, Hino and the Yasu)drain into the Lake. The surveys were made from 1951 to 1967. In the area surveyed, two species of freshwater planarians, Dugesia japonica ICHIKAWA et KAWAKATSU and Phagocata vivida(LJIMA et KABURAKI), were found. D. japonica was most common at the stations both in the plain and the mountainous districts(below the altitude of about 1060 metres). Ph. vivida was found only at the stations of cold-water within the altitude range from about 600 to 1140 metres or more. The type of the vertical distribution in the area surveyed is J-JV-V(J : D. japonica; V : Ph. vivida).
1968-06-01