Freshwater and Brackish-water Macroinvertebrates in the Ogasawara Islands

Abstract

During the past twenty years several surveys have been conducted on the freshwater and brackish-water macroinvertebrates of the Ogasawara Islands. As a result, several species of macroinvertebrates have been described as new species endemic to these islands. Subsequent investigation has shown that some of these endemic species are on the verge of extinction. Consequently, the species are treated as threatened or endangered species in the Red List by the Ministry of the Environment, Japan.