温帯に生息する食虫性コウモリの生理・生態的適応に関する研究 : I.ユビナガコウモリの探食活動について

概要

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About one or two hours before emergence from th cave, the bats' levels of vocalization had already risen and they flew near the roosts. Such an early awakening is probably due to endogeneous activity rhythm. A few minutes before they emerged, light sampling behavior could be seen. Accordingly, the emergence time was synchronized with the sunset time, and also correlated with the time of appearance of prey. In early spring and late autumn, the bats tended to become most active soon after sunset and secondarily active before sunrise. This activity pattern corresponded to the feeding pattern. But in summer, feeding lasted until about 2 : 00 a.m. Dispersion of the bats in early spring may reduce intraspecific competition for food. Nocturnal changes of stomach contents corresponded with quantitative and qualitative changes of insect prey collected by light trap. The staple food of the bats was Lepidoptera. The size (body length) of the prey was less than 25 mm. Though prey was very sparse in late autumn, the body fat of bats began to increase rapidly. The body weight at the onset of hibernation was heavy as their localities changed from the warm to the cool temperate zone. It was closely related to the period of hibemation.
日本生態学会の論文
1975-12-31