Abstract
Morphological (craniometrical characteristics and variations of cusp t3 on the second upper molar (M2)) and genetic (polymorphism of chromosomes and blood proteins) variability was analyzed in small island populations of the striped field mouse Apodemus agrarius Pallas, 1771 from the Peter the Great Bay (Sea of Japan). It was found that the absence of t3 on M2 is not a specific trait for A. agrarius. It was demonstrated that the population of field mice on the Bolshoy Pelis Island significantly differs from the populations from other islands and from the mainland according to the craniometrical parameters, teeth phenes, and variants of blood transferrin. The possible age of establishment of the island populations of the striped field mouse is discussed.
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