著者

八木橋 元一 石田 幸子 手代木 渉

出版者

東京動物學會

雑誌

動物学雑誌

巻号頁・発行日

vol.90, no.4, 1981

著者

手代木 渉 志田 孝夫

出版者

日本動物学会

雑誌

動物学雑誌 (ISSN:00445118)

巻号頁・発行日

vol.77, no.11, pp.350-358, 1968-11

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It is well known that in the amphibian tail the main axis of regeneration blastema is at the right angle with the cut-surface (Barfurth, 1923). The same view has been held by many investigators who worked with various animals. For supporting this view, the cellular materials concerned in regeneration must be produced uniformly from the cut-surface, as stated by E. Korschelt (1927) and Yo. K. Okada (1950). However, this did not hold in planarians, since the rate of production of new tissue at the cut-surfaces differs along the longitudinal or the lateral axes of the body. The rate of regeneration in the amphibian tail was exactly the same to that of planarians. When the planarian or amphibian tail was sectioned obliquely, the axis of blastema was not always at the right angle with the cut-surface. It has been conclusively shown in the planarian and amphibian tail that as the acute angle between cut-surface and the main axis of the body (section angle) approaches the right angle, the acute angle of blastema-axis to the main axis of the body (regeneration angle) falls to zero, while, the regeneration angle becomes at the right angle as the section angle approaches zero. This can be mainly explained by differences in the rate of regeneration of new tissue along the cut-surface of the oblique section.

著者

川勝 正治 手代木 渉 八木橋 元一

出版者

日本生態学会

雑誌

日本生態学会誌 (ISSN:00215007)

巻号頁・発行日

vol.19, no.2, pp.43-47, 1969-04-01

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The vertical distribution of freshwater planarians in the Tsugaru Peninsula in Aomori Prefecture (Lat. 40°40′N. to lat. 41°20′N. and Long, 140°10′E. to Long. 140°45′E.), the northernmost part of Honshu, was surveyed in 1966 and 1967. The Peninsula faces both the Tsugaru Straits and Mutsu Bay. The larger part of the Peninsula is covered with low mountains, of which the highest peak is 827 metres in height. The south-western part of the Peninsula is characterized by a level plain of cultivation. The main river system in the area surveyed is the Iwaki, which discharges into Juni-ko Lake and the Sea of Japan. In the area surveyed, six species of freshwater planarians, Dugesia japonica ICHIKAWA et KAWAKATSU, Phagocata vivida (IJIMA et KABURAKI), Phagocata teshirogii ICHIKAWA et KAWAKATSU, Polycelis auriculata IJIMA et KABURAKI, Polycelis sapporo (IJIMA et KABURAKI) and Dendrocoelopsis lacteus ICHIKAWA et OKUGAWA, were found. D. japonica was found to be common at the stations below the altitude of about 160 metres (inhabitable water temperature range, 8.0〜22.2℃). Ph. vivida was common at the stations below the altitude of about 380 metres (5.0〜21.8.C). Pol. auriculata was found in both the cold-water mountain streams and in some cold-water springs in the seaward district (0.5〜480m, 9.0〜14.0℃). Pol. sapporo, one of the common species in Hokkaido, was found at the stations below the altitude of about 120 metres (9.0〜21.8℃). It is an interesting fact that this species was rather common at the stations in the Tappizaki Cape district in the Tsugaru Peninsula. Small populations of Ph. teshirogii and Den. lacteus were found in the Tsugaru Peninsula. The type of the vertical distribution of the planarians in the area surveyed is (JSV)-JSVA-SVA-VA-A (J : D. japonica ; V : Ph. vivida ; S : Pol. sapporo ; A : Pol. auriculata). The geographical distribution of Pol. sapporo and Den. lacteus in Honshu were discussed. According to the best of our knowledge, Pol. sapporo has been recorded only from the northern side of the demarcation line drawn between the base of the Shimokita Peninsula and of the Tsugaru Peninsula (cf. KAWAKATSU 1965,p. 356,Fig. 5,1967,p. 125,Fig. 5). Den. lacteus has been recorded both from the Tsugaru Peninsula and in a little south of the southern demarcation line of distribution of Pol. sapporo (cf. KAWAKATSU, TESHIROGI, ISHIOKA & KASAHARA 1968).

著者

川勝 正治 手代木 渉 八木橋 元一

出版者

日本生態学会

雑誌

日本生態学会誌 (ISSN:00215007)

巻号頁・発行日

vol.17, no.1, pp.34-41, 1967-02-01

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In this paper, the vertical distribution of freshwater planarians in Hirosaki City, the Mt. Iwaki district (Lat. 40°30′N. to 40°50′N. and Long. 140°15′E. to 140°30′E.) and in the Juniko district (Lat. 40°32′N. to 40°35′N. and Long. 139°56′E. to 140°00′E.), all in the western part of Aomori Prefecture, Honshu, is reported. Mt. Iwaki (altitude, 1625 metres) is an extinct volcano of the Chokai Volcanic Zone and is situated at the south-western corner of the Tsugaru Plain. The Juniko district near the seashore of the Sea of Japan is characterized by many ponds or marshs. The main river systems in the area surveyed are the Iwaki and the Narusawa. The surveys were made in the summer of 1965 and in the spring and summer of 1966. In the area surveyed, five species of freshwater planarians, Dugesia japonica ICHIKAWA et KAWAKATSU, Phagocata vivida (IJIMA et KABURAKI), Phagocata teshirogii ICHIKAWA et KAWAKATSU, Polycelis auriculata IJIMA et KABURAKI and Bdellocephala brunnea IJIMA et KABURAKI, were found. D. japonica and Bd. brunnea were found to be common in many springs in Hirosaki City. Small populations of Ph. vivida and of Ph. teshirogii were also found in some of these springs. In the other districts of the area surveyed, D. japonica, Ph. vivida and Pol. auriculata were widely distributed. D. japonica was found in the stations below the altitude of about 525 metres (inhabitable water temperature range, 9.0〜25.0℃). Ph. vivida was found in the stations within the altitude range from about 40 to 620 metres (5.0〜15.0℃) above sea level. It is however clear that Ph. vivida is the species of nondominance in the western part of Aomori Prefecture. Pol. auriculata was common in the stations within the altitude range from about 200 to 1320 metres (5.0〜14.5℃). The type of the vertical distribution in the area surveyed is shown as J-JV-JVA-VA-A (J : D. japonica ; V : Ph. vivida ; A : Pol. auriculata). The geographical distribution and the breeding of Bd. brunnea were also discussed. According to the best of our knowledge, this species is distributed in Middle and North Honshu (from Kyoto City in the Kinki Region to the Shimokita Peninsula in the northernmost part of the Tohoku Region). In general, their active breeding season was from early February to mid-May. In one breeding period one worm laid one cocoon of 2 to 2.5mm in diametre. The hatching of the cocoons was observed within 23 to 37 days after the laying. In the laboratory cultures, 3 to 12 jveniles were released from one cocooon.