Analyses of the shift in range margin (in km/year) of 114 European birds with their northernmost distributional margin in southern Finland (‘southern’ species) and 34 northern breeding species with their southernmost distributional margin in northern Finland.

Comparison is between pairwise combinations of the first, second and third atlas (A1, A2, A3, respectively) of Finnish breeding birds (Table 1). Analyses are linear regressions of the annual change in weighted mean latitude between atlases as a function of the logged proportional annual change in range size (ΔRange) weighted by the log10 of species' range size in the most historic atlas in each comparison. The ‘shift’ is the intercept of this linear regression and estimates the change in range margin corrected for the change in the other variables. In bold are those shifts which remain significant after Bonferroni-Holm correction for multiple testing [28]. Plots of the analyses are provided in Figure 1.