Life potential of amphimictic and apomictic spined loaches (Cypriniformes, Cobitidae, Cobitis): comparisons by the invasion by bloodfish parasites and the number of nuclear fragmentations

1Mezhzherin, SV, Saliy, TV, 1Tsyba, AA, Losev, AA
1I. I. Schmalhausen Institute of Zoology of the NAS of Ukraine, Kyiv
Dopov. Nac. akad. nauk Ukr. 2017, 11:83-89
Section: Biology
Language: Russian

A comparative analysis of diploid and invasive polyploid spiny loaches of the genus Cobitis of two rivers of the Middle Dnieper basin showed that these forms do not differ in the degree of resistance to the invasion by bloodfish parasites Trypanosoma cobitis, although the fraction of fragmented nuclei of erythrocytes is unambiguously higher in polyploid forms (especially tetraploid forms) than in diploid forms. Nevertheless, this negative circumstance has no effect on the general fitness of triploid and tetraploid individuals, whose representation in the Dnipro basin is much higher than that of the diploids and is due to the expansion that took place in the 1960s. The studied indicators are subject to seasonal dynamics. The maximum contamination is achieved in the first decade of August, and the greatest number of fragmented nuclei of red blood cells falls in September.

Keywords: blood parasite, Cobitis, diploid-polyploid forms, micronucleus
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