Effective population size, within-sample genetic diversity estimates, and temporal genetic stability between historical and contemporary samples within 21 Atlantic salmon rivers located throughout Norway. For full data, including locus specific statistics see Table S2.

Within samples: LD = observed number of deviations from linkage disequilibrium (231 pair-wise tests per population, 211 tests for Opo) at α 0.05, HW = observed deviations from Hardy Weinberg Equilibrium (22 tests per population, 21 tests for Opo) at α 0.05, AR = allelic richness computed using re-sample size of 25 (note Opo samples only computed with 21 loci therefore not directly comparable to other populations), Ne = effective population size as computed from LD method in LDNE [90] Inf = Infinity suggesting that the population is “relatively large” (i.e., >200) [93], # = harmonic mean sample size less than 30 and therefore estimated Ne not to be trusted. Between temporal samples: * = FST significant at α 0.05, ** = FST significant at α 0.001 (and following Bonferroni), NC = not computed, Exclusion from hist. = percentage of fish from the contemporary population that are excluded from the historical population profile in the program Geneclass at a cut off of α 0.001, temporal change ? = whether significant temporal genetic change is reported within rivers at α 0.001 based upon pair-wise FST for both sets of microsatellites.