Reproductive Potentials of Diploid and Polyploidy Representatives of the Genus Сobitis (Cypriniformes, Cobitidae)

Vestnik Zoologii. 2017;51(1):37-44 DOI 10.1515/vzoo-2017-0006

 

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Journal Title: Vestnik Zoologii

ISSN: 2073-2333 (Online)

Publisher: Sciendo

Society/Institution: Schmalhausen Institute of Zoology, National Academy of Sciences of Ukraine

LCC Subject Category: Science: Zoology

Country of publisher: Poland

Language of fulltext: English

Full-text formats available: PDF

 

AUTHORS

Mezhzherin S. V. (Schmalhausen Institute of Zoology, NAS of Ukraine, B. Khmelnytskogo st., 15, Kyiv, 01030, Ukraine)
Salyy T. V. (Schmalhausen Institute of Zoology, NAS of Ukraine, B. Khmelnytskogo st., 15, Kyiv, 01030, Ukraine)
Tsyba A. A. (Schmalhausen Institute of Zoology, NAS of Ukraine, B. Khmelnytskogo st., 15, Kyiv, 01030, Ukraine)

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Time From Submission to Publication: 10 weeks

 

Abstract | Full Text

Comparison of reproductive parameters in several Cobitis forms with different ploidy shows that the maximum fertility is found in diploid Cobitis, the triploids are less fertile and the tetraploids even less fecund. The latter reach maximum values of size and weight indicators but minimum number of eggs, the smallest size of the ovaries but the biggest eggs. Nevertheless, the combined reproductive potential of polyploid females is higher than of diploid spiny loaches with equal ratios of males to females in populations. The obvious reasons for the successful expansion of polyploid individuals of the spiny loaches are both their higher fertility at the population level and the changes in environmental conditions associated with the regulation of all major rivers in Ukraine in the 1960-1970s.