On the litter size of Japanese voles (Microtinae)

概要

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Variation of litter sizes and correlation between litter size and number of mammae were studied on the following Japanese species: Microtus montebelli, Clethrionomys rufocanus bedfordiae, Aschizomys niigatae, Eothenomys smithi and Eothenomys kageus. The variations of litter sizes of those species are shown in table 1. The mammal formulae are always 2+0+2=8 in montebelli, bedfordiae and niigatae, 1+0+2=6 in smithi and 0+0+2=4 in kageus. Therefore the litter size (table 1) and number of mammae are evidently correlative in those species except niigatae (r±PEr =0.739±0.051) . Aschizomys niigatae which had been reffered to Clethrionomys is quite different in litter size from bedfordiae in spite of the same number in mamrnae.
日本哺乳類学会の論文