ニホンヒキガエルBufo japonicus japonicusの自然誌的研究 : XII.生息場所集団の年令構成と個体数変動

概要

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Annual population fluctuations of a habitat group of the Japanese toad, Bufo japonicus japonicus, breeding at a pond (H) in the Botanical Garden of Kanazawa University, were observed and estimated from 1971 to 1981. The production of young toads of this pond group was very large during 1971,1972 and 1975,low during 1973,and zero during 1974 and from 1976 to 1981. The population structure of the pond H group at the spring of 1973 consisted of 1971 (35%) and 1972 (62%) year classes and, at the spring of 1976,of 1972 (20%), 1973 (3%) and 1975 (42%) year classes. Population fluctuations of the pond H group were as follows ; about 3,000 individuals at the spring of 1973,1,800 in 1974,1,100 in 1975,1,700 in 1976,1,100 in 1977,700 in 1978,500 in 1979,250 in 1980,and 100 in 1981.
日本生態学会の論文
1986-12-31