The mean FST values determined for the 10 allozyme and the eleven independent RFLP loci were virtually unaffected by pooling (0.013 and 0.068, respectively), thus eliminating the possibility that the greater number of RFLP alleles led to a spurious elevation in the magnitude of population differentiation observed. No correlation was observed between the degree of heterozygosity of a locus and its FsT value for either the allozymes (T = 0.495, P = 0.146) or the RFLPs (T = 0.256, P = 0.447)