| reproductive isolating mechanisms and molecular phylogenetic relationships among palearctic and oriental brown frogs. | crossing experiments were made among various brown frog species and populations collected from japan, china, russia and taiwan. the main purpose of these experiments was to confirm the existence of reproductive isolating mechanisms among rana pirica from japan, r. chensinensis from china and r. chensinensis from russia, and between these three taxa and the other brown frogs distributed in the palearctic and oriental regions. it was found that there was no or a slight gametic isolation among the ... | 2003 | 12777828 |