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[Is sexual dimorphism variable? Data on species of the genus Martes in the Urals].

Sexual dimorphism in cranial measurements was studied in Ural populations of two species of the genus Martes, M. martes and M. zibellina. The index of sexual dimorphism averaged 8.39% in the former and 9.03% in the latter, being subject to geographic variation. For the first time, temporal variability of sexual dimorphism in dimensional characters was revealed in mammals by analyzing M. zibellina samples collected in different decades of the second half of the 20th century. The majority of corresponding microtrends had reciprocating dynamics.