隠岐および鳥取県大山における小哺乳類の採集結果

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The authors collected small mammals on Mt. Daisen in south-west Honshu and the Oki Islands. The Oki Islands lie in the Japan Sea about 80km off the northern coast of south-west Honshu, the main island of Japan. The Oki Islands consist of Dôgo Island and Dôzen Islands. Dôgo Island, the largest of the Oki Islands, have an area of 246km2. Dôzen Islands are the general name for the group of islands which are situated at some distance from Dôgo. The vegetation of Oki Islands, apparently the laurilignosa climax, consisted chiefly of Cyclobalanopsis and Machilus. The vegetation of the montane zone (alt. 800-1600m) of Mt. Daisen in south-west Honshu has the appearance of decidous forest the climax, consisting of Fagus. Total number captured was 196 with the following proportional breakdown: On Dôgo Island (420 traps-nights) Apodemus speciosus navigator _??_23, _??_30 Apodemus argenteus celatus _??_1, _??_4 Eothenomys smithi okiensis _??_2 Urotrichus talpoides minutus _??_10, _??_25 On Dôzen Islands (160 trap-nights) Apodemus speciosus navigator _??_6, _??_14 Apodemus argenteus celatus _??_1, _??_2 Urotrichus talpoides minutus _??_1, _??_3 On Mt. Daisen (montane zone) (260 trap-nights) Apodemus speciosus speciosus _??_19, _??_8, unknown 1 Apodemus argenteus argenteus _??_10, _??_11 Eothenomys srnithi smithi _??_5, _??_3, unknown 1 Urotrichus talpoides hondonis _??_8, _??_8 Body size, testicle size, and embryo size of each species are shown in Tables 1-8. We compared the island forms with the main land forms and the following tendencies were noted. 1) Coloration of back and abdomen is blackish in island forms of Apodemus speciosus, A. argenteus and Eothenomys srnithi. 2) Body sizes of island forms of Apodemus speciosus are larger than the main land form. In the Dôzen Islands form especially, the hind foot length is conspicuously larger than both main land and Dôgo Island forms.

隠岐および鳥取県大山における小哺乳類の採集結果

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