青森県の東部地域の淡水棲三岐腸類の分布を調査した結果,ナミウズムシ Dugesia japonica ICHIKAWA et KAWAKATSU,ミヤマウズムシ Phagonica vivida(IJIMA et KABURAKI),カズノウズムシ Polycelis auriculata lJIMA et KABURAKI,キタシロカズメウズムシ Polycelis sapporo(IJIMA et KABURAKl)及びイズミオオウズムシ Bdellocephala bwnnea IJIMA et KABURAKlの5種の棲息が確認された。D.japonicaは平地と山地の水域に広く分布しており,谷地温泉附近で標高高760～820mの地点にも出現した。その他の棲息地は標高ほぼ600m以下であった。Ph. vividaは平地と山地の水域に広く分布しているが,東部地域では,その様息地は比較的少ない。Pol. auriculataは山地の水域に広く分布しており,その棲息地も多い。東部地域の海岸附近の冷泉からも出現した。Pol. sapporoは日本海側の荒川水系と浅瀬石川水系の一部から記録された(本種の分布南限)。その棲息地は少ない。Bd. brunneaは田代平高原の湧泉から記録された。分布範囲の広い4種の棲息地の垂直分布範囲と棲息水温範囲はD. japonica(10～840m,8.5～27.0℃)Ph. vivida(15～70m,10.0～20.30℃),Pol.auriculata(10～780m,7.5～20.3℃),Pol. sapporo(200～720m,9.5～18.0℃)であった。青森県下でPol. sapporoと Den. lacteus はほぼ同じ水系に分布しており,両種の分布南限線は津軽半島と下北半島の其部を結ぶ線であるが,部分的にはやや南にずれている(岩木山と八甲田山を結ぶ線)。青森県全域における垂直分布型は,Pol. sapporoの分布南限線を境として二つの型に区別できる。即ち,十和田国立公園以南地域はJ-JV-JVA-VA-A のように,それ以北の地域はJVA-JSVA-SVA-VA-A のように示される。

Report on the ecological survey of freshwater planarians in the eastern part of Aomori Prefecture, Honshu, with a note on the southern limit of distribution of Polycelis sapporo and Dendrocoelopsis lacteus. MASAHARU KAWAKATSU (Biological Laboratory, Fuji Women's College, Sapporo), WATARU TESHIROGI and HIDEICHI FUJIWARA (Biological Institute, Faculty of Sciences, Hirosaki University, Hirosaki). The vertical distribution of freshwater planarians in the eastern part of Aomori Prefecture (Lat. 40°10'N. to Lat. 40°50'N. and Long. 140°40'E. to 140°50'E.) was surveyed in 1967, 1968, 1969 and 1970 (cf. KAWAKATSU, 1961 a ; KAWAKATSU, TESHIROGI, ISHIOKA & KASAHARA 1968). In the area surveyed, five species of freshwater planarians, Dugesia japonica ICHIKAWA et KAWAKATSU, Phagocata vivida (IJIMA et KABURAKI), Polycelis auriculata IJIMA et KABURAKI, Polycelis sapporo (IJIMA et KABURAKI) and Bdellocephala brunnea IJIMA et KABURAKI, were found. D. japonica was found to be common at the stations below the altitude of about 600 metres. In the vicinity of Yachi Hot Spring in the Towada National Park, this species was found in some stations within the altitude range of about 760 to 840 metres (inhabitable water temperature range, 8.5～27.0%). Ph. vivida was rather common at the stations below the altitude of about 700 metres (10.0～20.3℃). Pol. auriculata was most common in both the cold-water mountain streams and in some cold-water springs in the seaward district (10～780m, 7.5～20.3℃). Pol. sapporo was found only in some stations in the Arakawa River system (the Jogakura Valley) and in the Aseishi River system (the Nakano River) (200～720m, 9.5～18.0℃). Bd. brunnea was found only in some stations in the Tashiro Height. The geographical distribution range of Pol. sapporo and Den. lacteus in Honshu were rediscussed (cf. KAWAKATSU, TESHIROGI & YAGIHASHI 1969). The southern demarcation line of distribution of Pol. sapporo is identical with that of Den. lacteus. Namely, the southern limit of distribuiton of both species is: the base of the Tsugaru Peninsula～Mt. Iwaki～Mts. Hakkoda～the base of the Shimokita Peninsula. The types of the vertical distribution of planarians in Aomori Prefecture are shown as J-JV-JVAVA-A (the Towada National Park district) and JVA-JSVA-SVA-VA-A (the Tsugaru Peninsula and the Shimokita Peninsula) (J:D. japonica; V: Ph. vivida; S: Pol. sapporo; A: Pol. auriculata).

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