Invasion information | ||
Range in Japan | Ogasawara (Chichijima and Hahajima Is.), Daito (Kita-daitojima and Minami-daitojima Is.), and Sakishima (Ishigakijima, Iriomotejima, and Hatomajima Is.) Islands. | |
Origin | Saipan (Ogasawara population); Minami-daitojima Is. (Ishigakijima population); Ishigakijima Is. (Hatomajima population), etc. | |
Date | Before W. W. II (Minami-daitojima population); 1949 (Chichijima population, Ogasawara); 1974 (Hahajima population, Ogasawara); around 1978 (Ishigakijima population); around 1984 (Hatomajima population) | |
Route | Deliberate: For biological control of cane agricultural pests Accidental: Hitchhiking on building material | |
Impact | Predation on invertebrates; Competition with native species; Toxic to predators (e.g., several snakes, birds, and wild cat); Water pollution by infestation of tadpoles. Native organism(s) affected: Ground invertebrates (predation); small reptiles and amphibians (competition); some snakes, birds, and wild cat (toxic); | |
Regulation in Japan | Import, transport and keeping are prohibited in Japan by the Invasive Alien Species Act. | |
Introduced range in other countries | Hawaii, Philippine, New Guinea, Australia, and several Pacific Islands. |
Reference | Notes |
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100 of the World’s Worst Invasive Alien Species, 100 of the Japan’s Worst Invasive Alien Species |