[Morphological variability of Microtus oeconomus pallas (Rodentia, Rrvicolidae) from Baikal region]

The analysis of morphological variability of the ten samples of Microtus oeconomus from islands of Baikal and adjacent regions gas shown, that island samples differ from continental ones by complex of parameters, defining proportions of a skuul, mainly, proportions of an auditory region. Island samples also differ higher indexes of complexity and asymmetry of morphotypes of the third upper molar. An environment of the Baikal islands differ absence of the damp habitats preferred Microtus oeconomus, and also colder microclimate that has caused forming original morphological character of island micropopulations.