Rana japonica

Basic information
Scientific name	Rana japonica	Click to magnify
Common names	Japanese brown frog
Higher taxon	Ranidae, Anura, Amphibia
Natural range	Honshu, Shikoku, Kyushu and peripheral islands around those mainlands.
Habitat	Forest, rice field.

Invasion information
Range in Japan	Hachijojima Island.
Origin	Unknown.
Date	Given several descriptions on literatures, introduced between 1911 and 1924.
Route	Unknown. possibly deliberate introduction as education material or accidental introduction with some transport.
Impact	Uknown. Alhtough this species may be a predator for ground dwelling invertebrates, the impact may be little due to small density of the frog. Native organism(s) affected: Ground dwelling invertebrates.
Regulation in Japan	No action for prevention, mitigation, control, or eradication.
Introduced range in other countries	None.

Reference

Notes

Goris (1967) The reptiles and amphibians of Hachijojima Island. Japanese Journal of Herpetology. 2(3):25-30.
Hasegawa (1999) Impacts of the introduced weasel on the insular food webs. pp.129-154. Ota (編) Tropical Island Herpetofauna: Origin, Current Diversity, and Conservation. Elsevier Science B. V., Amsterdam.
Sengoku et al. (eds) (1996) The Encyclopedia of Animals in Japan 5 Amphibians, Reptiles, Chondrichthyes. Heibonsha, Tokyo (in Jpn)
etc.

This species was drastically declined in 1960s by the introduction of the weasel Mustela itatsi.