香川県低山麓におけるスミスネズミの個体数と繁殖活動の季節変化
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The seasonal changes of small rodents and insectivores collected and reproduction of Eothenomys smithii were studied at the pine forests of Minoura (34°02′30″N, 133°37°30″E, alt. 65-140m), 1977-80. E. smithii and Apodemus argenteus were dominant in numbers collected from winter to spring, whereas A. speciosus was captured throughout a year, though the number fluctuated around five to ten. The proportion of E. smithii collected correlated significantly with that of A. speciosus collected at eight habitats : E. smithii was relatively dominant in the habitats of highest ferns and wet condition on the ground surface. Reproductive seasons were judged as October to April in E. smithii in the study area. The number of E. smithii collected suggests that a distribution study should be carried out in February and March for E. smithii, which lives in the foot of mountains in Shikoku.1977年7月〜1980年5月にわたって, 香川県三豊郡豊浜町箕浦のアカマツ・クロマツ混交林(標高65〜140m)において, 月あたりのベワナ数495個で採集をおこない, 小哺乳類の個体数とスミスネズミの繁殖活動の季節変化を調べた。スミスネズミとヒメネズミは冬季から春季にかけて多く捕獲され, アカネズミは年間を通じて捕獲された。8棲息場所別捕獲割合はスミスネズミとアカネズミとの間で逆相関となり, スミスネズミはシダ類の高さの高い, より湿潤なところで多く捕獲された。本調査地のスミスネズミの繁殖期は4〜10月と推定された。本調査からスミスネズミの低山麓の分布調査には2〜3月におこなうことが必要であると結論づけられた。
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