Natural hybridization and introgression between Rana nigromaculata and Rana porosa porosa in central Japan Masayuki Sumida1, Tatsuo Ishihara2 1 Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University, Higashihiroshima 739, Japan 2 Owakidani Natural History Museum, Hakone, Kanagawa 250-06, Japan Abstract. In order to elucidate the extent of natural hybridization and gene introgression between two Japanese pond frog species, Rana nigromaculata and Rana porosa porosa, 16 pond frogs from the Sengokuhara popu- lation in the Hakone district in central Japan were analyzed for morphological characters, allozymes, mtDNA and reproductive capacity. The results revealed that they consisted of pure Rana nigromaculata, F1 hybrids and a backcross hybrid. Introduction Japanese pond frogs can be divided into five races on the basis of morphological as well as distributional differences (Moriya, 1954). Of these, the nigromaculata common race is reproductively isolated from the other four races by hybrid male sterility shown in crossing experiments (Moriya, 1960a, b). Based on Moriya's observations, Kawamura (1962) divided Japanese pond frogs into two species, Rana nigromaculata Hallowell and Rana brevipoda Ito, the latter with two subspecies, Rana brevipoda brevipoda Ito and Rana brevipoda porosa Cope. Because of the priority of Cope's (1868) name, these are correctly
Amphibia-Reptilia – Brill
Published: Jan 1, 1997
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