Figure 6. Pairwise trait correlation between primary dormancy, flowering time or growth rate change significantly along the latitudinal gradient.

The correlation coefficient r (−1<r<1), on the y-axis, was calculated along a sliding latitudinal window with a fixed number of 45 genotypes. The average latitude of each 45-genotype window is given on the x-axis. Red points show local r values with associated p<0.05. The change in pairwise trait correlation r with latitude was quantified by the regression coefficient R², and its associated p-value (see methods). With the exception of (d), results hold when sliding windows encompass 25 or 30 genotypes.