2003 年 9 巻 p. 109-114
A creature is extremely sensitive to environmental changes. The Hida salamander lives underwater while still in larval stage, and eventually lives on land when it reaches maturity. The influences of weather and vegetation characteristics on the habitation of the Hida salamander, which was observed at the upper forested valley of the Kiso River for three years, were investigated. The number of Hida salamanders depended on the meteorological factors such as the mean temperature and the annual precipitation. It was particularly clear that these numbers drastically decreased when the water was at a high temperature. Moreover, the vegetation characteristics such as the stem volume, the forest age and the growth rate were important factor to them. Their number was increase at the good forest kept on the forest management.
