Reproductive activity of the large Japanese field mouse (<i>Apodemus speciosus</i>) in the Oze district in northeastern Honshu, Japan

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  • 尾瀬地域におけるアカネズミの繁殖活動
  • オゼ チイキ ニ オケル アカネズミ ノ ハンショク カツドウ

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Reproductive activity of the large Japanese field mouse (Apodemus speciosus) was studied in woodlands at an altitude of 1,000–1,900 m in the Oze district in northeastern Honshu, Japan. The present surveys were carried out from mid-July to early August of each year during 1985 to 1999 except for 1986 and 1991. Males with body weights of 30.1 g or more and females with body weights of 25.1 g or more were regarded as adults, according to the developmental conditions of genital organs. I estimated that 45.8% (125/273 individuals) of adult males and 16.4% (37/225 individuals) of adult females were considered to be reproductive. As a lactating pregnant female was captured, some females seemed to become pregnant twice or more during each breeding season. It was supposed that the breeding season, including the copulation period, of A. speciosus in this survey area seemed to date back to late May, judging from the estimated birth time of the captured juveniles. Therefore, it seemed that the breeding season in A. speciosus in this area ranged from at least May until August.<br>

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