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Fig. S1 Proportion of distinct multilocus genotypes (MLGs) within each Arabidopsis thaliana population.

Fig. S2 Frequency distribution of the 419 genome-wide distinct SNP multilocus genotypes found across 4621 individuals of Arabidopsis thaliana sampled across the Norwegian distribution range.

Fig. S3 Relationship between Nei's genetic distance, Da (Nei et al., 1983), and log10 geographical distance (km) for different years/cohorts in natural populations of Arabidopsis thaliana.

Fig. S4 Loge probability of data (loge P(D)) for each K, for = 1–25, as estimated by STRUCTURE in 222 seed bank and above-ground cohorts of Arabidopsis thaliana.

Fig. S5 Frequency distribution of migration rates, (a) across all 222 cohorts included and (b) in 36 populations averaged over multiple cohorts.

Fig. S6 Estimated average migration rate ± SE across all cohorts for 36 natural populations of Arabidopsis thaliana.

Fig. S7 Average estimated migration rate ± 95% CI based on different assignment probability thresholds.

Fig. S8 Average number of SNPs differing between putative migrants and resident genotypes in Arabidopsis thaliana populations.

Table S1 Geographical coordinates (decimal degrees), altitude (m above sea level) and number of cohorts sampled for 36 Norwegian populations of Arabidopsis thaliana

Table S2 Average migration rate across multiple cohorts based on an assignment method in GeneClass2, with different probability thresholds

Table S3 Genetic characteristics of 222 above-ground and seed bank cohorts of Arabidopsis thaliana surveyed over five consecutive years

Table S4 Genetic characteristics of natural populations of Arabidopsis thaliana surveyed over five consecutive years for both seed bank and above-ground individuals

Table S5 Number of distinct multilocus genotypes (MLGs) within 36 populations of Arabidopsis thaliana

Table S6 Identical multilocus genotypes (MLG) detected between different populations of Arabidopsis thaliana

Table S7 Frequency of multilocus genotypes (MLG) observed over ≥ 2 cohorts in natural populations of Arabidopsis thaliana