Normalized FST between benthic-limnetic species pairs from three lakes (A) and genome-wide association mapping for lake size across 33 solitary stickleback populations (B). Data points represent 50-kb windows and either show average FST (A) or the lowest p-value (B) for each window. Red lines indicate the 95th percentile for benthic-limnetic FST and the significance cutoff for the lake size GWAS (P < 0.05). Green data points represent repeated FST outliers for the benthic-limnetic species pairs. Horizontal black and grey lines highlight chromosomes with significant enrichment of FST outlier windows (A) or significant lake size GWAS windows (B).