Fig. 2

Inverse relationship between starting allele frequency and selection strength. For all experiments, the selection targets were identified using the same protocol and are based on the top 10% SNPs in reconstructed haplotypes. A The relationship is shown for the Portugal cold experiment. The color code reflects the size of the selected haplotype block, and starting allele frequencies and selection coefficient of the selection targets are plotted on x- and y-axis. The numbers relate to the selected haplotype blocks from Fig. 1B and C with numbers indicating blocks detected in the analysis using all time points. Sub-blocks resulting from an analysis using earlier time points are labeled with the letters a, b, or c. B A qualitatively similar relationship between starting allele frequency of each haplotype block and selection strength is found in the cold-evolved Portugal (blue), hot-evolved Portugal (red), and hot-evolved Florida (pink) population. Nevertheless, the distribution in the Florida experiment was shifted towards lower selection coefficients while the two temperature regimes in the Portugal population were highly similar. We conclude that the adaptive architecture is population-specific but does not depend on the temperature regime