Low genetic diversity, local-scale structure, and distinct genetic integrity of Korean chum salmon (<i>Oncorhynchus keta</i>) at the species range margin suggest a priority for conservation efforts.

The hierarchical AMOVA for both mtDNA and microsatellites showed a lack of genetic structure between wild and hatchery groups (mtDNA: F CT = −0.006, p = 0.835; microsatellites: F CT = 0.001, p = 0.059), but rather highly significant genetic structure among populations within groups (mtDNA: F SC = 0.035, p < 0.001; microsatellites: F SC = 0.021, p < 0.001; Table S3 ).

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