著者

今泉 吉典

出版者

国立科学博物館

雑誌

国立科学博物館専報 (ISSN:00824755)

巻号頁・発行日

vol.6, pp.1-8, 1973

著者

今泉 吉典

出版者

日本動物分類学会

雑誌

動物分類学会会報

巻号頁・発行日

no.27, pp.6-10, 1962-07-06

被引用文献数

1

著者

今泉 吉典

出版者

裳華房

雑誌

遺伝 (ISSN:03870022)

巻号頁・発行日

vol.36, no.5, pp.p4-8, 1982-05

著者

今泉 吉典

出版者

国立科学博物館

雑誌

国立科学博物館専報 (ISSN:00824755)

巻号頁・発行日

vol.1, pp.84-91, 1968

被引用文献数

2

---

Three hundred specimens of small mammals, belonging to 10 species, were collected in Mt. Goyo (about 15km west of Kamaishi City, Iwate Pref.) and Mt. Hayachine (about 40km southeast of Morioka City, Iwate Pref.) during a short trip in the early summer of 1967. The most interesting mammals among them was Euroscaptor mizura mizura (GUNTHER, 1880) which was collected at the upper part of Tatamiishi (1100m alt.), Mt. Goyo. The subspecies is a rare animal in Japan and the specimen obtained here is the 8th record from the country, and, at the same time, new to the Tohoku district, Honshu. One of the most difficult problems of taxonomy among the Japanese small mammals is the status of Aschizomys andersoni (THOMAS, 1905) from northern Honshu. Twenty-one specimens of this species were collected during the trip to Mt. Goyo and Mt. Hayachine, and studied statistically by a simplified method employing the association coefficient in numerical taxonomy. The dendrogram (Fig. 1) made by the method clearly expresses the similarity of the Goyo-Hayachine populations to the population from Mt. Zao and, onthe other hand, the distinction between them and the other populations of central Honshu. These morphological relationships and the differentiation of the vertical distribution recognized among groups of Aschizomys in Honshu indicate the specific distinction of Aschizomys andersoni, which is represented by the populations of Mt. Goyo, Mt. Hayachine or Mt. Zao, from A. niigatae of central Honshu. The small mammal fauna of Mt. Goyo is peculiar among those of mountains of the Tohoku district in having the combination of Euroscaptor mizura mizura and Aschizomys andersoni, while that of Mt. Hayachine seems to be similar to the latter, although it could not be fully clarified by the present survey.

著者

今泉 吉典 青木 淳一 浅沼 靖 土居 祥兌 小山 博滋 斎藤 靖二 氏家 宏

出版者

国立科学博物館

雑誌

国立科学博物館専報 (ISSN:00824755)

巻号頁・発行日

vol.7, pp.1-18, 1974

著者

今泉 吉典

出版者

国立科学博物館

雑誌

国立科学博物館研究報告 (ISSN:00280119)

巻号頁・発行日

vol.6, no.4, 1963-12

著者

今泉 吉典

出版者

国立科学博物館

雑誌

国立科学博物館専報 (ISSN:00824755)

巻号頁・発行日

vol.3, pp.381-395, 1970

著者

今泉 吉典

出版者

日本鳥学会

雑誌

鳥 (ISSN:00409480)

巻号頁・発行日

vol.25, no.99, pp.p5-6, 1976-06

著者

今泉 吉典

出版者

山梨県立富士国立公園博物館

雑誌

県立富士国立公園博物館研究報告

巻号頁・発行日

no.3, pp.1-6, 1960-03

著者

吉行 瑞子 今泉 吉典

出版者

神奈川県立博物館

雑誌

神奈川県立博物館研究報告 自然科学 (ISSN:04531906)

巻号頁・発行日

no.21, pp.p81-98, 1992-03

著者

今泉 吉典

出版者

国立科学博物館

雑誌

国立科学博物館専報 (ISSN:00824755)

巻号頁・発行日

vol.5, pp.131-149, 1972

被引用文献数

8

---

According to the investigation executed by the party from the National Science Museum, Tokyo, in the summers of 1970 and 1971,the small mammal fauna of the Hidaka Mountains, Hokkaido, is fairly different from most of the plains but rather similar to that of Rishiri Island, a small island off the northern extremity of the main island, in the combination of important species. They resemble each other not only in the presence of a vole of the Clethrionomys rex group and a tiny shrew nearly related to Sorex gracillimus THOMAS, 1907,but also in the absence of Sorex shinto saevus THOMAS, 1907,one of the two common shrews in the plains of the main island of Hokkaido. Voles of the rex group, containing Clethrionomys rex IMAIZUMI, 1971,of Rishiri Island and C. montanus sp. nov. of the Hidaka Mountains, are evidently more primitive in several external, cranial and dental characters than those of the rufocanus group, which contains C. bedfordiae (THOMAS, 1905) of the main island of Hokkaido and C. sikotanensis (TOKUDA, 1935) of Rishiri I. and Shikotan I. of the Habomai Islands. Moreover, within the respective groups, the forms of small islands are less advanced than those of the main island as shown in Fig. 1. These nearly related forms belonging to the same clade with compete each other when they are in a sympatric condition of distribution, because they are probably poorly differentiated in the ecological niche. In such cases more advanced forms tend to destroy the primitive ones, as clearly seen in three lineages of Japanese moles, Mogera minor, M. wogura and M. kobeae (IMAIZUMI, 1964). A lineage, here used by the author, is a taxon applied not only to good species but also ill-defined hemispecies or even some of subspecies based on the biological species concept, and differs from other lineages by the relative time of emergence or of animated expansion of the distribution. Such competition may be more violent in a combination of nearest two lineages than that of rather remote ones, as the former is less different in physical characters and also in ecological niches than the latter. Evident correlations between the degree of specialization and the relative time of emergence of taxa have been confirmed among the lineages of the glareolus group, of the Japanese moles, etc. If this is acceptable as a general rule, the earliest of the four lineages of the voles that arrived in the Hokkaido district might be Clethrionomys rex, now confined to Rishiri Island (Fig.1). At first probably C. rex and then C. sikotanensis expanded their distribution nearly all over the district. Later, both of the populations were exterminated from the main island of Hokkaido through violent competitions with newly arrived and more advanced lineages, C. montanus of the former group and C. bedfordiae of the latter one. On the other hand, not so violent but rather loose competitions have been carried on between these conquerors, and montanus was gradually exterminated from the plains and finally almost confined to the alpine and subalpine zones of the Hidaka Mountains. Very similar process of emergences and competitions might be carried out between Sorex shinto saevus and a tiny shrew similar to Sorex gracillimus. The former, which has now nearly exterminated tha latter from the plains of the main island, probably failed to invade into Rishiri Island because of its later arrival. Thus, the similarities between the small mammal faunas of Rishiri Island and the high mountain zone of Hidaka Mountains can easily be understood as a result of successive appearances and expansions of slightly advanced lineages in the same clade and violent competitions between them which can be hindered by some topographical factors.

著者

今泉 吉典 吉行 瑞子 土屋 公幸

出版者

日本哺乳類学会

雑誌

哺乳動物学雑誌: The Journal of the Mammalogical Society of Japan (ISSN:05460670)

巻号頁・発行日

vol.3, no.2, pp.44-45, 1966-09-30 (Released:2010-08-25)

参考文献数

2

著者

シートン著 内山賢次訳 . 今泉吉典著

出版者

国土社

巻号頁・発行日

1965

著者

今泉吉典文 石田武雄[ほか]画 宇野義雄編

出版者

小学館

巻号頁・発行日

1963

著者

今泉吉典著

出版者

洋々書房

巻号頁・発行日

1949

著者

今泉吉典監修

出版者

講談社

巻号頁・発行日

1964

著者

今泉吉典著

出版者

誠文堂新光社

巻号頁・発行日

1967

著者

ライフ編集部編 マーストン・ベイツ解説 今泉吉典訳

出版者

時事通信社

巻号頁・発行日

1965

著者

今泉吉典著

出版者

第一法規出版社

巻号頁・発行日

1966

著者

今泉吉典[ほか]著

出版者

講談社

巻号頁・発行日

1966