Seasonal changes of emergence number, sex ratio and age composition in the same colony of Pipistrellus abramus in Kagawa prefecture, Japan

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  • アブラコウモリ Pipistrellus abramus 同一集団の出巣個体数，性比および年齢構成の季節的変化
  • アブラコウモリPipistrellus abramus同一集団の出巣固体数,性比および年齢構成の季節変化
  • アブラコウモリ Pipistrellus abramus ドウイツ シュウダン ノ シュッソウ コタイスウ セイヒ オヨビ ネンレイ コウセイ ノ キセツ ヘンカ

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Seasonal changes of emergence number, sex ratio and age composition in a colony of Pipistrellus abramus were investigated in Kagawa Prefecture from 1993 to 2000. The number of emergence was the maximum when new born young emerged in the nest of the colony. The maximum number was 213 individuals in 1993. The number did not rise over in the succeding years, suggesting no growth of the number of the colony. Sex ratio changes in each period of life. In the period of parturition, there were no males. The largest part of the age composition in each period of life was young and a few adult females. It is suggested that the longest survival was five years in females and 10 months in males, respectively.

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