Local adaptation sustains genetic differentiation between two varieties of Chinese walnut (<i>Juglans cathayensis</i>) despite extensive hybridization in subtropical China.

Limited introgressed loci associated with local adaptation in the hybrid zone When hybrid fitness involves multiple loci with different impacts, those under strong selection are likely to be significant β outliers, whereas weakly selected loci will show excess ancestry based on α outliers ( Gompert and Buerkle, 2012 ; Guo et al., 2023a ).

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