Reproductive activity of the Smith’s Red-backed vole (<i>Eothenomys smithii</i>) at Mt. Kumotori, Chichibu Mountains, eastern Honshu, Japan

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  • 秩父山地雲取山におけるスミスネズミの繁殖活動
  • チチブ サンチ クモトリヤマ ニ オケル スミスネズミ ノ ハンショク カツドウ

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Reproductive activity of the Smith’s Red-backed vole (Eothenomys smithii) was studied in a woodland at 1,000–2,000 m altitude at Mt. Kumotori, Chichibu Mountains, eastern Honshu, Japan. The present surveys were carried out from April 1981 to October 1986. The specimens investigated were 48 males and 44 females. Males and females with body weights of 17.1 g or more were regarded as adults, according to the developmental conditions of genital organs. 71.0% (31/48 individuals) of adult males and 56.7% (30/46 individuals) of adult females were actively reproductive. Two pregnant, lactating females were observed, and pregnancy twice and more times during each breeding season was confirmed. Mean embryo size was 2.13 in eight pregnant females. The breeding season for E. smithii in this area was estimated as occurring from March to September, based on the period when reproductively active individuals were captured, and on the estimated copulation time from observed lactation and capture times of dams with juveniles.<br>

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