Spined Loache Settlements Structure (Cobitidae) of the Eastern Ukraine River Systems and Alternative Character of Diploid and Polyploids Populations

The structure of spined loaches diploid-poliploid complex Cobitis genera representatives as well Sabanjeewia aurata the Eastern Ukraine river systems were investigated by allozyme analysis and cytometry. In total 39 samples 1412 specimens from upper left tributaries Dnieper River, Donets Basin, coastal rivers Azov Sea Lower studied. We identified C. (superspecies taenia) (51,6% all researched specimens). C melanoleuca (4,1%), S. (1,1%), allodiploids × (0,3%) two groups polyploid hybrids (46,4%). EET-group includs mainly elongatoides – 2 taenia tanaitica. (2,8%) is represented only tanaitica biotype. Dnieper, there a zone introgressive hybridization between settlements differs accordingly to basins has tendency decreasing polyploids frequency respetivly meridional direction. collected in 1938 Middle part River 1971 leads conclusion that mentioned above regions appeared 1960-1970s. diploid-polyploid an alternative character. More often, predominance diploids or polyploids. reason such bipolarity could be reproductive displacement so relatively strong tolerance anthropogenic climate change.