著者
奥野 良之助
出版者
日本生態学会
雑誌
日本生態学会誌 (ISSN:00215007)
巻号頁・発行日
vol.34, no.1, pp.113-121, 1984-03-30

About 1,500 individuals of the Japanese toad, Bufo japonicus japonicus, inhabiting the campus of Kanazawa University were studied by the toe-clipping marking method from 1973 to 1981. Investigations of the six breeding ponds on the campus revealed that toads belonging to each breeding group generally went to the same pond for breeding every spring throughout their life. The largest breeding group (pond H-group) had about 200 adult males and females, and the smallest one (pond N-group) had only 20 adults. Emigrations of toads among these breeding groups sometimes occurred. Twenty-five toads changed their breeding pond during the 8 years ; twenty-three of them moved from the largest pond H-group to the neighbouring smaller Y-and M-group ponds. Therefore, it was concluded that emigrations may occur from a larger group to a smaller one.

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