초록

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A total of 2,344 individuals of Allochthonius buanensis Lee was collected from March 1993 to February 1995 at the Piagol, Mt. Chili. Of these, 42％ were protonymphs, 25％were deutonymphs, 11％ were tritonymphs, and 22％ were adults. The maximum population density was recorded both in 1993 and 1994 in Se...

A total of 2,344 individuals of Allochthonius buanensis Lee was collected from March 1993 to February 1995 at the Piagol, Mt. Chili. Of these, 42％ were protonymphs, 25％were deutonymphs, 11％ were tritonymphs, and 22％ were adults. The maximum population density was recorded both in 1993 and 1994 in September. The population increased rapidly during the breeding season between summer and autumn and thereafter gradually decreased through winter toward the following March. Three nymphal and adult stages occurred almost simultaneously. The life span of this species is apparently one year. Sixty per cent of all specimens were obtained below 600m in altitude. Sex ratio of this species was approximately 1 female : 2 males.

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