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Genetic structure of diploid-polyploid complex of spined loach genus Cobitis (Cypriniformes, Cobitidae) in the Lower Danube

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Abstract

The extremely high diversity of spined loach biotypes in the Lower Danube has been detected by biochemical genetic investigation and cytometric analysis of 358 specimens collected in the riverbed and shallow channels. Along with two diploid species (C. elongatoides and C. “tanaitica”), six hybrid forms were revealed, namely, diploid C. elongatoides-“tanaitica”; triploid C. 2 elongatoides-“tanaitica,” C. elongatoides-2 “tanaitica,” and C. 2 elongatoides-species-1; and tetraploid C. 3 elongatoides-“tanaitica” and C. elongatoides-species-2-2 “tanaitica.” In addition, specimens with recombinant genotypes were also found. In spite of the apomictic mode of reproduction, the polyploids did not possess clonal structure, but according to the level of polymorphism and the genotype distribution, they were isomorphous to parental diploid species. Thus, in contrast to the polyploidy in Cobitids of the Dnieper, which have appeared in the basin due to the expansion, the polyploids of the Lower Danube are autochthonous and were derived by crossing with local diploid species. The process is apparently proceeds without any limitations.

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Authors and Affiliations

  1. Shmal’gausen Institute of Zoology, Ukrainian National Academy of Sciences, Kyiv, Ukraine

    S. V. Mezhzherin & L. I. Pavlenko

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  1. S. V. Mezhzherin
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  2. L. I. Pavlenko
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Original Russian Text © S.V. Mezhzherin, L.I. Pavlenko, 2007, published in Tsitologiya i Genetika, 2007, Vol. 41, No. 1, pp. 56–65.

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Mezhzherin, S.V., Pavlenko, L.I. Genetic structure of diploid-polyploid complex of spined loach genus Cobitis (Cypriniformes, Cobitidae) in the Lower Danube. Cytol. Genet. 41, 49–56 (2007). https://doi.org/10.3103/S0095452707010070

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  • DOI: https://doi.org/10.3103/S0095452707010070

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