Evolutionary Implications of Karyotypic Variation In Some Insular Peromyscus from British Columbia, Canada

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A karyological investigation of Peromyscus found upon the islands along the coast of British Columbia, Canada, has revealed two karyotypic patterns. These two karyotypes correlate with both morphological and reproductive patterns exist-ing among these island populations. This evidence has led me to revise the taxo-nomy so that the large morph with the high F.N. karyotype is classified as Pero-myscus sitkensis and the small morph low F.N. karyotype remaining Peromyscus maniculatus.