Chironomid midges (Diptera, Chironomidae) in filtration plants in Japan during summer : Filtration plants in Honshu compared with those in the Sakishima Islands

Abstract

Chironomid fauna in slow sand filter beds were investigated and compared with those at two different water filtration plants; one in southwestern Japan, i. e., the Sakishima Islands, and the other in a plateau area, i. e., Honshu Island. As a result, the midges were found to be dominated by three taxa, Cricotopus, Paratrichocladius rufiventris and Tanytarsus oyamai at two filtration plants in the center of Honshu Island. On the other hand, in the Sakishima Islands, the most abundant species was Polypedilum nubifer, which was also collected on Honshu Island. In addition, we recorded two chironomid species from the Sakishima Islands.