オオシマアカネズミの腹毛に見られる性的及び季節的多型について Sexual and seasonal polymorphisms in Apodemus speciosus insperatus from Oshima Is., Japan

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オオシマアカネズミの標本95点を調査した結果,次のことが判明した。(1)夏毛と冬毛は背毛では刺毛の有無により,腹毛では色彩によってほぼ判定することができる。(2)更毛は年2回,4・5月と10・11月に行なわれる。(3)腹毛には夏毛・冬毛ともほぼ2つの色型があり,冬毛よりも夏毛の方が明らかに濃色である。(4)腹毛の色彩は夏毛・冬毛とも♂ よりも♀のほうが濃色の傾向が強い。

To analyze the variability expressed in the coloration of the ventral fur of Apodemus speciosus insperatus KURODA, 1938, 95 adult skins, collected from Oshima Is., Seven Islands of Izu, were carefully studied. By this examination, following phenomena were confirmed in this subspecies : 1. Five color types are distinguished in the ventral fur (Fig. 2). Among them types A and B are always connected with winter dorsal fur without spines and types D and E with summer dorsal fur with distinct spines (Table 1), therefore they are recognized as winter and summer ventral furs respectively. Type C is, however, intermediate and difficult to determine the nature exactly. 2. The molting occurs twice a year, one in April to May and the other in October to November. 3. Types A and B of winter pelage are white and buffy white respectively. While, types D and E of summer pelage are ochraceous-buff, at least on the central region, and remarkably darker than the winter pelage (seasonal polymor phism). 4. In the winter pelage, type A is more aboundant in the males than in the females, and in the summer pelage, type E is predominant in the females ; that is the females evidently darker than the males both in winter and summer pelages . Thus, obvious tendency to sexual polymorphism is observed.

収録刊行物

  • 哺乳動物学雑誌: The Journal of the Mammalogical Society of Japan

    哺乳動物学雑誌: The Journal of the Mammalogical Society of Japan 4(4-6), 102-106, 1969

    日本哺乳類学会

各種コード

  • NII論文ID(NAID)
    130005071318
  • NII書誌ID(NCID)
    AN00231634
  • 本文言語コード
    JPN
  • ISSN
    0546-0670
  • NDL 記事登録ID
    8450434
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z18-20
  • データ提供元
    NDL  J-STAGE 
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