Allozyme variation in Chiloglanis paratus and C. pretoriae (Pisces, Mochokidae) from the Limpopo River system, Southern Africa

Abstract

The gene products of 32 protein coding loci in two populations of Chiloglanis paratus and one population of C. pretoriae were examined by horizontal starch-gel electrophoresis. Genetic variability estimates were low in all three populations. The percentage of polymorphic loci using the 95% criterion ranged from 6.3% to 9.4% and observed (HO) and expected heterozygosity (HE) values for the three populations ranged from HO = 0.022 to 0.031 and HE = 0.025 to 0.036 respectively. Fixed allele mobility differences between the two species were observed at 17 loci and deviations of genotypes from Hardy-Weinberg expectations occurred at six loci. Genetic distance and Wright’s fixation index estimates were consistent with values expected for conspecific populations but indicated extensive genetic differentiation between the congeneric species.

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