四国石鎚山系の淡水産プラナリアの生態調査報告

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In the present paper, a description is given of the vertical distribution of freshwater planarians in the Ishizuchi mountain range (the main peak, Mt. Ishizuchi, is 1920m in height) in Shikoku in the southwest Japan. The area surveyed is situated from Lat. 33°42′ N. to 33°50′ N. and from Long. 133°03′ E. to 133°11′ E. The surveys were made in July and October 1958. In the district, the two species of freshwater planarians, Dugesia gonocephala (DUGES) and Phagocata vivida (IJIMA et KABURAKI), were found, D. gonocephala had been collected in relatively warm rivers, creeks, brooks and brooklets below the altitude of about 1230 metres. This species is the most common Japanese planarian ; it was also found in the streams running through the plains and lower mountain districts in Shikoku. Ph. vivida was rather common in the cold-water biotopes within the altitude range from about 1000 to 1850 metres. The inhabitable water temperature range of D. gonocephala and Ph. vivida found in the Ishizuchi mountain range is as follows : D. gonocephala (10.8〜22.5℃) ; Ph. vivida (2.3〜16.1℃). They were found together where their inhabitable water temperature overlapped. The type of vertical distribution of the district is G-GV-V (G : D. gonocephala ; V : Ph. vivida). The biotopes are described in detail. No planarian was found in the localities which were polluted with toxic discharge of the abandoned Omori Copper Min (Nagose Valley and Kawaguchi Valley). The distribution of Ph. vivida in the southwest Japan is also described. It has been recorded only on the northern side of the demarcation line drawn from the Suzuka mountain range, Mt. Odaigawara and Mt. Koya in the Kinki Region in Honshu to the Ishizuchi mountain range in Shikoku and Mt. Sobo in Kyushu.
1963-12-01

四国石鎚山系の淡水産プラナリアの生態調査報告

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