佐久盆地およびその近接地域の淡水産プラナリアの生態調査報告

概要

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The present paper is a report of the vertical distribution of freshwater planarians in the Saku Basin (the basin of the upper part of the Chikuma River) and its adjacent mountainous districts in the eastern part of the Chubu Region in Honshu. The surveys in most of the stations were made from spring to autumn of 1971, 1972 and 1973. In the area surveyed, three species of freshwater planarians were found: Dugesia japonica Ichikawa et Kawakatsu, Phagocata vivida (Ijima et Kaburaki) and Polycelis auriculata Ijima et Kaburaki. D. japonica was common in the stations below the altitudes of about 1500 meters. Ph. vivida was most common in the cold-water stations within altitudes from about 920 to 2400 meters. Pol. auriculata was common in the cold-water stations within altitudes from about 1100 to 2050 meters. The inhabitable water temperature range of these species was as follows: D. japonica, 2.0〜18.9℃, (including data obtained in winter); Ph. vivida, 4.0〜18.9℃; Pol, auriculata, 7.6〜18.6℃. The type of the vertical distribution in the area surveyed is shown as J-JV-JAV-AV-V (the japonica-vivida-auriculata area).
1974-09-25