福島県いわき市の河川で採集された暖水性の水生動物5種

抄録

Two warm-water fish species, Eleotris fusca (Bloch and Schneider, 1801) and Sicyopterus japonicus (Tanaka, 1909), and three warm-water decapod crustacean species, Macrobrachium formosense Bate, 1868, M. japonicum (De Haan, 1849), and Varuna sp., were collected from a river in Iwaki, Fukushima Prefecture, Japan. The occurrence of E. fusca represents a new record from the prefecture and the northernmost record for the species. It is likely that M. japonicum overwintered, but the other four species probably dispersed from the south via ocean currents. In recent years, the range of many species has been extending northward due to global warming and thermal discharge. To understand changes in the distribution and habitat of these aquatic animal species, it is necessary to continue monitoring the occurrence of warm-water aquatic animals in coastal areas and rivers in the prefecture.