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Natural hybridization and introgression between Rana nigromaculata and Rana porosa porosa in central Japan

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image of Amphibia-Reptilia

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 population 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.

Affiliations: 1: Laboratory for Amphibian Biology, Faculty of Science, Hiroshima University, Higashihiroshima 739, Japan; 2: Owakidani Natural History Museum, Hakone, Kanagawa 250-06, Japan


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