Abstract
In order to examine agricultural channels from the aspect of migration hindrances to creatures such as frogs that perform terrestrial migration, it is critical to investigate locomotive abilities of those creatures that inhabit paddy field areas with agricultural channels. In this study, I investigated horizontal and vertical jumping abilities of Japanese Tree frog (Hyla japonica), Black-spotted pond frog (Rana nigromaculata), Montane Brown frog (Rana ornativentris), and Wrinkled frog (Rana rugosa). In the horizontal jumping tests. Montane Brown frog showed the maximum score of 980 mm and Black-spotted pond frog showed the maximum score of 450mm in vertical jumping tests. Japanese Tree frog showed the minimum scores in both categories. Based on the results, we proposed ideal dimensions of agricultural channels for frogs to live with. Each frog was able to consider becoming a factor of migration hindrances and population loss on a scale of the channel more than 300*150mm in the period of sub-adult.
