This species is endemic to Japan. The nominate subspecies R.p. porosa is distributed in Kanto District, Sendai Plain and Shinano River, Honshu Island; R.p. brevipoda is distributed in Nagano Prefecture, Tokai District, Kinki District and Setouchi District, in western Honshu and Shikoku islands.
Habitat and Ecology
Both subspecies occur in grassland, paddy fields, rivers, ditches and other wetlands in lowland areas. Rana porosa breeds in paddy fields and wetlands. It is always found near water.
More information is needed.
The major threat to this species is habitat destruction, including decreasing numbers of paddy fields, construction of roads and housing, and water pollution.
The species range includes several protected areas. A population recovery programme has been made by an NGO in Hiroshima Prefecture (R.p. brevipoda). R.p. brevipoda is listed in the Japanese Red Data Book.
Red List Status
Least Concern (LC)
Listed as Least Concern in view of its wide distribution, tolerance of a degree of habitat modification, presumed large population, and because it is unlikely to be declining fast enough to qualify for listing in a more threatened category.
Pelophylax porosus is divided into two very distinct parapatric subspecies: P.p. porosa (Cope, 1868) and P.p. brevipoda (Okada, 1966).
Yoshio Kaneko, Masafumi Matsui 2004. Pelophylax porosus. The IUCN Red List of Threatened Species 2004: e.T58699A11815556. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T58699A11815556.en .Downloaded on 17 January 2019