The stream population NID shows the strongest signal for the D-statistic, the other stream populations (S1, S2) also show D-statistics significantly different from zero and two lake populations have marginally significant D-statistics (L1, L2, but not ROM, Supplementary Fig. 2 ), indicating varying extents of admixture with a West European lineage.
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Admixture between old lineages facilitated contemporary ecological speciation in Lake Constance stickleback.
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