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FIS for each locus within each locality estimated using the Nei & Chesser 1983 equation; Null allele frequency estimated using Brookfield I equation (Brookfield 1986); SE, standard error. * indicates significant FIS (p-value below 0.01), or loci showing evidence for null alleles. For each locus the ALL POPS Ar and HS are the means of these two parameters over the six sampling localities FIS was calculated using equation FIS = 1 -HO/ HS, and FST was calculated using equation FST = 1 -HO/ HT, where HO and HS are averages of these values across the six populations, and HT is the overall gene diversity (shown in Table 1) Underlined loci are the 25 retained for the population genetics analyses, Within population Ar and HS averages and the ALL POPS HS, FIS, and FST averages (bottom row) calculated for the 25 underlined loci only. Within population FIS is the multilocus estimate of Wright's inbreeding coefficient ,