Appendix S1 Localities and years sampled of common eider populations assayed in this study.

Appendix S2 Indices of genetic diversity for common eider populations assayed from microsatellite loci, nuclear gene introns and mitochondrial DNA control region.

Appendix S3 PHASE results for nuclear gene introns sequenced from common eiders.

Appendix S4 Inter-population comparisons of genetic differentiation estimated among common eider populations.

Appendix S5 Pairwise gene-flow estimates among common eider populations.

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