GENETIC-VARIABILITY IN CHONDROSTOMA FROM AUSTRIAN, FRENCH AND GREEK RIVERS (TELEOSTEI, CYPRINIDAE)

Allozyme variation in Chondrostoma from Austrian, French and northern Creek rivers was investigated. Populations of C. nasus from the upper Danube catchment are genetically very similar and apparently connected by high levels of gene flow. Chondrostoma nasus has conserved all maj or allozyme polymorphisms during its recent range expansion into the R hone basin. Chondrostoma vardarense from the Aries and Aliakmonas rive rs share most of their allozymes with C. nasus from the upper Danube c atchment, but have less genetic variation, a possible consequence of a genetic bottleneck following river capture.