Morphometric difference between the Novosibirsk and Tomsk chromosome races of<Emphasis Type="Italic">Sorex araneus</Emphasis> in a zone of parapatry |
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Authors: | Andrei V Polyakov Sergei S Onischenko Vadim B Ilyashenko Jeremy B Searle Pavel M Borodin |
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Institution: | (1) Department of Genetics and Animal Breeding, Wrocław University of Environmental and Life Sciences, Kożuchowska 7, 51-631 Wrocław, Poland;(2) Institute of Zoology, Wrocław University, Sienkiewicza 21, 50-335 Wrocław, Poland |
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Abstract: | A hybrid zone between the Novosibirsk and Tomsk chromosome races of the common shrewSorex araneus Linnaeus, 1758 was found near Novosibirsk city (West Siberia, Russia) in an area unimpeded by geographic barriers. In this zone, the shrews of both races and their hybrids were trapped and karyotyped and 22 features of their cranial and postcranial skeleton were measured. Canonical discriminant analysis revealed 3 distinct groups of individuals, which corresponded to the 3 karyotypic categories involved in the analysis. The first discriminant function reflected the differences in the size of skeletal elements. The Novosibirsk shrews and the hybrids were significantly smaller than the Tomsk shrews. The second discriminant function was interpreted as a parameter of skeletal proportionality. The hybrids were significantly less proportional than the parental races. This study revealed one of the clearest examples of morphological differentiation between chromosome races of the common shrew. |
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