The significant differences among populations revealed by the DNA markers suggests that some of the remaining allozyme. Loci previously assumed, to, be neutral may actually be the selected set. The dilemma created by the patterns of DNA polymor -. Phism is why allele frequencies at the protein loci have not drifted to a similar extent. Balancing selection may be invoked. To explain the uniform frequencies of alleles at moderately and highly polymorphic allozymel OCI (G3p1 Zdh-1 Ldh-3 and,,, Pgml), but is unlikely to ac - count for the invariant patterns of alleles at weakly poly - morphic loci. The proposed maintenance. Of such uni - form frequencies by selection contrasts sharply with the strong associations of several well characterized. Allo - zyme polymorphisms with varying environmental fac - tors such as temperature (e.g, VICUE and JOHNSON 1973; WATT 1977;? PLACE and POWERS 1979) or salinity (e.g, KOEHN et al. 1980).
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