Entomological and ecological surveys on Mt. Usu in 1984 VI: Faunal make-up and ecological distribution of springtails (Collembola) on Volcano Usu

A survey of springtails was conducted in 1984 on Volcano Usu which suffered damage to it's ecosystem from eruptions in 1977 and 1978. The summit area, almost completely deforested by the eruptions, was still inhabited by many forest species such asDesoria notabilis, Willowsia sp. 2,Pseudachorutes sp. 2,Isotoma sp. 4,Tullbergia yosii, Onychiurus sp. 1,Entomobrya sp. 2,Isotomiella minor, Proisotoma sp. 2,Xenylla sp.,Neanura frigida, etc. These species preferred standing or fallen dead trees, mosses, bark chips, former topsoils and soil around the root of plants. The fauna in the summit area was most similar to that of coniferous or broad-leaved forests surveyed on the foot of the mountain. This suggests that the 1977–78 eruptions did not exterminate these springtail species which probably survived on the standing trees or in the former topsoil.