Geographical Distribution of Plasma Esterase in the Bedford's Red-backed Vole, Clethrionomys rufocanus bedfordiae (THOMAS)

Abstract

Esterase bands in the vole were found to be highly polymorphic in natural populations of Hokkaido. Of the twenty-two bands observed, Es-3-Es-6 showed the geographical cline in their frequencies. The frequencies of them declined gradually from the southern region to the northern and eastern regions.