Fluctuation in abundance and age structure of a breeding population of the Japanese brown frog, Rana japonica gunther (Amphibia, anura).


A breeding population of Rana japonica was studied at a marsh on the campus of Hiroshima University in Higashi-Hiroshima during the five years 1995-1999. The mark-recapture study showed that the size of the breeding population varied from year to year, and increased more than twofold in 1999 in comparison with the preceding years. The sex ratio of the… (More)


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