アカネズミ(Apodemus speciosus)の心室重量における季節変動

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The Japanese wood mouse, Apodemus speciosus, is distributed widely in Japan. The author studied the seasonal variation in heart weights of Japanese wood mice in central Honshu, Japan. A total of 292 wood mice were collected with snap traps in the period from November, 1968 to October, 1974. The hearts were removed and carefully separated into two parts of right and left ventricular walls, the latter including interventricular septum. Then, they were dried and weighed. By applying the allometric equation y=bxa or log y=logb+a log x, the author analyzed allometric growth of the total ventricular weight (TVW), left ventricular weight (LVW) and right ventricular weight (RVW) against the body weight. And then, each ventricular weight at 30 g body weight was calculated from these allometric equations for studying the seasonal variation. Seasonal variation of the ratio of the right ventricular weight to the total one (RVW/TVW) was also calculated. The results are shown in Figs. 1-3 and Table 1. As shown here, TVW, LVW and RVW of the Japanese wood mice collected in late autumn and winter were significantly larger than those collected in summer. These tendencies were observed from all the collected regions. These seasonal changes in heart weights are considered to be an aspect of adaptation to seasonal temperature changes, especially to decreasing temperatures in late autumn and winter.
日本哺乳類学会の論文