神奈川県江の島の両生類相 ―江の島および境川流域におけるヌマガエルの初記録―

抄録

The purpose of this study was to determine the distribution and population size of the frog Fejervarya kawamurai on Enoshima Island, Kanagawa Prefecture, central Japan. Between September 2009 and July 2011, we conducted a survey of amphibians on Enoshima Island. During this period, we recorded four amphibian species, namely, Bufo japonicus formosus, Hyla japonica, Rana catesbeiana, and F. kawamurai. This is this first time that F. kawamurai has been recorded from Enoshima. They were able to confirm in grassland, sandy beach where flowed of the fresh water and the pavement of the top of the island. The larvae and eggs of F. kawamurai were not found in this investigation the island. The adults, juveniles, larvae, and eggs of F. kawamurai have, nevertheless, been found in rice fields along the Sakai River, the mouth of which is located approximately 300 m from Enoshima. We thus assume that F. kawamurai frogs were carried to Enoshima Island during periods when the Sakai River was in flood.