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
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.
- 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