For each locus, all possible pairwise comparisons of allele
frequency distributions were made. When probabilities
were combined across loci, six comparisons involving
Charleston Harbor, South Carolina, January 1998 and
March 1999; Mississippi River Delta, Louisiana, 1996 and
1997; West Delta, Louisiana; Texas; or Mexico were statistically
significant after correction for multiple comparisons
(Table 2). Four of these comparisons were between western
Atlantic and Gulf of Mexico samples and two were
between Gulf of Mexico samples.