Current distribution of American bullfrog Rana catesbeiana Shaw, 1802 in the Republic of Korea.
American bullfrog Rana catesbeiana Shaw, 1802 (= Lithobates catesbeianus) is one of the world's most problematic amphibians. In both 1957 and 1973, the species was introduced to the Republic of Korea, in order to be bred as a food resource. However, after breeding efforts failed, the breeders illegally released the frogs into the wild. Now, about 50 years later, the species is distributed throughout the nation. The aim of our study was to document the distribution of R. catesbeiana throughout the Republic of Korea by analyzing several nationwide surveys. The species was reported to occur at 2,716 sites, mainly along the southern and western coasts, but was rarely distributed in the northern part of Korea or along the eastern coast. Further studies are needed to elucidate the effect of R. catesbeiana on the native ecosystems.