-25 migrants are estimated to be exchanged among populations each generation. The five private allozyme alleles provide a nearly identical estimate. From the FST values of individual loci, esti- mates of Nm from the allozymes vary from 8 to 125; from the RFLPs they range from 0.6 to 31. Averaging over all loci, the proteins provide an estimate that is five times greater than the RFLP loci (Nm = 17.7 us. 3.4, respectively). If the most variable locus is excluded from both sets of markers, the protein loci produce a 10-fold higher estimate thant he RFLPs. Despite the reduced gene flow suggested by the RFLP loci, all esti- mates still exceed the level expected to homogenize allele frequencies under a neutral model (ie., Nm ex- ceeding unity).