大山の小哺乳類に関する二,三の知見

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タイトル別名
  • Notes on the small mammals of Mt. Daisen, Tottori Pref., Honshu
  • タイザン ノ ショウホニュウルイ ニ カンスル ニ , サン ノ チケン

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抄録

On the 14th and 15th of October 1968, the author snap-trapped some small mammals on the northwestern slope of Mt. Daisen (1,711.9m alt.), Tottori Pre fecture. The trapping area was from about 850 to 1,650m alt. The part lower than about 1,200 m alt. in the area was covered with a beech forest, while the upper part was covered densely with low shrubs which mainly consisted of Taxus cuspi data var. nana, Salix sp., Alnus pendula, Fagus crenata, Sorbus commixta, Acer rufinerve, Acer mono, Weigela sp., etc. Taxus cuspidata var. nana was dominant near the summit. The species and numbers of the small mammals collected there are shown in Table 1. Apodemus speciosus occurred in the beech forest. Urotrichus talpoidea occurred at about 1,200 m alt. and Microtus montebelli at about 1,650 m alt. near the summit. Anteliomys smithi and Apodemus argenteus were collected extensively at the upper part in the area. Dymecodon pilirostris occurred from about 1,400 to 1,600 m alt. The last species does not seem to have been reported previous/1, from Chugoku districts. It was hard to find out that the external and cranial measurements of four specimens of Dymecodon pilirostris were different from those of the specimens collected at Mt. Kuj?, Ky? sh? (Table 2). Out of the animals listed in Table 1, only one male of Microtus montebelli was in breeding condition, for its testes were large with the length of 11 mm. But the testes of the other kinds of males in the same table were small and none of them were reproductively active. No females were pregnant and their reproductive tracts were small. It seemed that a female of Apodemus speciosus was lactating.

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