日本列島における小哺乳類の地理的変異に関する研究 : I. スミスネズミの地理的変異 : 第1報スミスネズミの分布

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In this paper the author explained the distribution of the Smith's red-backed vole, Eothenomys smithi. E. smithi is considered very close in its systematic position to E. custos of Yunnan, south-western China, among allied species in the Far East. In Japanese Islands, E. smithi occurs in central and south-western Honshu, Shikoku, northern part of Kyushu and Oki Islands. Their habitats are closely related to woodland, but there are no correlation to the kinds of forest trees. In southern Kyushu, Oki Islands, Shikoku and south-western Honshu, E. smithi is fairly common throughout the laurilignosa at the sea level to the subalpine coniferous forest, whereas in central Honshu, the habitats of E. smithi are restricted to the subalpine forest zone (Tsuga......Abies, alt. 1,000......2,400m) with alow population density. The lowlands of central and north-eastern Honshu are occupied by Microtus montebelli. In the subalpine forest zone, Clethrionomys andersoni occurs abundantly and in a sympatric relation with E. smithi. Therefore, we may think that the presence or the absence of competitors exerts far-reaching influences on the distribution of E. smithi.
1967-06-15