<p>The correlation coefficient <i>r</i> (−1<<i>r</i><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 <i>p</i><0.05. The change in pairwise trait correlation <i>r</i> with latitude was quantified by the regression coefficient R<sup>2</sup>, and its associated <i>p-value</i> (see methods). With the exception of (d), results hold when sliding windows encompass 25 or 30 genotypes.</p
