清澄山におけるヒメネズミ個体群の生態学的研究-1-生活史と個体数の変動
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A life cycle and fluctuations of population size of <I>A. argenteus argenteus</I> were studied from 1973 to 1976 in Mt. Kiyosumi, Chiba pref.<BR>1. The breeding season was twice in a year, spring (from February to April) and autumn (from September to November) . The duration of breeding periods varied in each year. The geographical variation of breeding season among some local populations seemed to be closely related to the temperature factor.<BR>The breeding periods seemed to be inversely related to the population density.<BR>Some females were observed to breed twice in the same breeing season.<BR>Litter size was 4.1 (n=14) on an average.<BR>2. No decrease of body weight was noticed in both males and females during autumn and winter.<BR>The growth pattern of litters was different between those of spring and autumn.<BR>Most of spring litters took part in autumn breeding of the year, but autumn litters did firstly in autumn breeding of the next year.<BR>3. Immigrant rates increased from autumn to the next spring and decreased towards summer, but disappearance rates showed no particular seasonal trend.<BR>Judging from the population changes on adults, it seemed that the period of dispersion was coincided with the mating season.<BR>4. Population density fluctuated between 23.0/ha at maximum and 5.6/ha at minimum through four years, and the relatively low density was maintained.<BR>Population density increased from autumn to the next spring and decreased towards summer every year.
- 日本哺乳類学会の論文
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