PHYLOGENETIC-RELATIONSHIPS OF LEUCISCUS-KEADICUS, AN ENDEMIC CYPRINIDSPECIES FROM GREECE, WITH OTHER GREEK SPECIES IN THE GENUS LEUCISCUS

The karyotype and the genetic divergence of Leuciscus keadicus, an end emic cyprinid species from Greece, in relation with other Leuciscus sp ecies occuring in Greece was investigated. Four different species of t he genus Leuciscus were examined by allozyme electrophoresis. These re sults indicated that genetic variation, as calculated from the degree of expected heterozygosity, ranges from 0.062 to 0, the latter was fou nd in L. keadicus only. The values of Nei's genetic distance among the four species examined ranged from 0.005 to 0.251. The time of diverge nce of L. keadicus from the other species was estimated about 5 My, in dicating the long isolation of this species. The karyotype of L. keadi cus consists of 2n=50 chromosomes, 7 pairs of metacentric, 6 pairs of submetacentric and 12 pairs of subtelocentric to acrocentric chromosom es.