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Narrow hybrid zone between Moscow and Western Dvina chromosomal races and specific features of population isolation in common shrew Sorex araneus (Mammalia)

  • Animal Genetics
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Abstract

The contact zone between Moscow and Western Dvina chromosomal races of common shrew Sorex araneus L. at the south of the Valdai Hights was traced over a distance of 20 km. Within this, close to parapatric, contact zone of chromosomal races the width of sympatry zone was about 500 m (the narrowest among currently known hybrid zones), and the proportion of hybrids was 24.3%. It was shown that in bimodal hybrid zones between chromosomal races of common shrew the width of sympatry zones varied from 0.5 to 13 km. This width does not correlate with the cytogenetic features of the hybrids, and seems to be determined by competitive relations between the races. The hybrid proportion is determined by the type of hybrid heterozygosity, and decreased in the race sympatry zone from 33–40 to 21.5–25.2%. The decrease of the hybrid proportion can be associated with the abnormal fertility of either the first generation, or the backcross hybrids.

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Authors and Affiliations

  1. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, 119071, Russia

    V. N. Orlov, Yu. M. Borisov, E. V. Cherepanova, O. O. Grigor’eva, A. G. Shestak & V. B. Sycheva

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  1. V. N. Orlov
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  2. Yu. M. Borisov
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  3. E. V. Cherepanova
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  4. O. O. Grigor’eva
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  5. A. G. Shestak
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  6. V. B. Sycheva
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Correspondence to V. N. Orlov.

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Original Russian Text © V.N. Orlov, Yu.M. Borisov, E.V. Cherepanova, O.O. Grigor’eva, A.G. Shestak, V.B. Sycheva, 2012, published in Genetika, 2012, Vol. 48, No. 1, pp. 80–88.

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Orlov, V.N., Borisov, Y.M., Cherepanova, E.V. et al. Narrow hybrid zone between Moscow and Western Dvina chromosomal races and specific features of population isolation in common shrew Sorex araneus (Mammalia). Russ J Genet 48, 70–78 (2012). https://doi.org/10.1134/S1022795412010152

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