Figure 5.

Regions of elevated divergence unique to each of four sparrows suggest independent adaptation to salt marsh environments. Top row: F _ST for putative regions under selection in savannah, Nelson's, song, and swamp sparrows. Candidate gene associated with each peak is labeled in each plot. Middle and bottom rows: Tajima's D and nucleotide diversity for the same elevated region, presented for coastal (darker colors) and interior (lighter colors) populations for each species. In all plots, elevated windows are shaded in gray. The four genes presented in this figure (WNK2, MMP17, MYOF, and SLC9A3) are lineage‐specific candidates for osmoregulatory function, demonstrating a mechanism for unique genetic pathways resulting in phenotypic convergence.