個体群サイクルに関連したヒメネズミの一腹仔数

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  • Litter Size of <I>Apodemus argenteus</I> in Relation to the Population Cycle
  • コタイグン サイクル ニ カンレンシタ ヒメネズミ ノ 1 フクシスウ エイブ

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Litter size of the small Japanese field mouse, Apodemus argenteus, was examined in relation to its population fluctuation in a natural mixed forest of Hokkaido. Overwintered females had a slightly higher litter size than did current year's females, although the difference was not significant. There was a significant positive relationship between litter size and body size ; the correlation coefficient obtained for current year's females was higher than that for overwintered females. There was a significant negative relationship between litter size and population density ; a higher correlation was detected for overwintered mice than for current year's mice. Pregnant females were captured only in the increase phase, except for a few in the decline phase in May of 1979. Litter size significantly varied from year to year. Higher litter sizes were closely associated with the autumn breeding, a prolongation of the breeding season related to the population cycle.

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