ADMIXTURE assignment probabilities for Eurasian wigeon, Mareca penelope (M.p.) and American wigeon, M. americana (M.a.) for (a) 3092 autosomal and (b) 189 Z-linked ddRAD-seq loci for K population values of 2 and 3 and one randomly chosen SNP from each locus. I – M.p. Siberia, II – M.p. Russian Far East, III – M.p. Western Beringia, IV – M.p. NA Pacific Flyway, V – M.p. NA Atlantic Flyway, VI – M.a. NA Pacific Flyway, VII – M.a. NA Central Flyway, VIII – M.a. NA Atlantic Flyway.