apparent reduction of gene flow in a hybrid zone between the West and North European karyotypic groups of the common shrew, Sorex araneus. II Andersson A-C. Lack of mitochondrial DNA structure between chromosome races of the common shrew, Sorex araneus, in Sweden. Implications for chromosomal evolution. (Manuscript).dian phylogeography of the common shrew (Sorex araneus). Post-glacial recolonis...