A note on daily movement patterns of a female Asiatic black bear (Ursus thibetanus) in a suburban area of Iwate Prefecture, northeastern Japan

摘要

On the basis of the genetic distances and the geological splitting time between Kamchatka and Kuril Archipelago as 10,000 years ago previously reported, we could estimate the divergence time between the two region populations of Holarctic arvicolids as a few ten thousand years at most. Namely, in the Russian Far East, a past geographic and/or environmental barrier seemed to have appeared and to have inhibited genetic communication between the Magadan and Kamchatka/Sakhalin/Kuril Archipelago regions in Mi. oeconomus and My. rutilus, before My. rufocanus had expanded its distribution there.