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Additional file 1: Figure S1. Latitude of the studied sites showing different symbols which correspond to poleward or northern (blue triangles), intermediate (black circles) and equatorward or southern (red squares) sites. Figure S2. Temperature and precipitation trends of the six species (a, Pinus uncinata; b, Abies alba; c, Fagus sylvatica; d, Pinus sylvestris; e, Quercus robur; f, Quercus petraea) studied in the northern (blue lines and symbols), intermediate (black lines and symbols) and southern (brown lines and symbols) tree populations for the period 1950–2006. Figure S3. Mean tree-ring width series of the six species (a, Pinus uncinata; b, Abies alba; c, Fagus sylvatica; d, Pinus sylvestris; e, Quercus robur; f, Quercus petraea) studied in the northern (blue lines), intermediate (black lines) and southern or rear-edge (brown lines) populations considering the period 1900–2018. Figure S4. Significance of the moving window correlations calculated between mean site series of ring-width indices of north, intermediate and south tree populations and monthly temperature data from previous September to September in the year of tree-ring formation. Previous and current months are abbreviated by lower- and upper-case letters, respectively. Moving correlations were obtained for 30-year intervals shifted by one year and the middle year of the interval is shown in x axes for each species (a, Pinus uncinata; b, Abies alba; c, Fagus sylvatica; d, Pinus sylvestris; e, Quercus robur; f, Quercus petraea). The colour scale shows the significance (p < 0.05) of the Pearson correlation coefficients (blue, significant negative values; red, significant positive values). Figure S5. Significance of the moving window correlations calculated between mean site series of ring-width indices of north, intermediate and south tree populations and monthly precipitation data from previous September to September in the year of tree-ring formation. Moving correlations were obtained for 30-year intervals shifted by one year and the middle year of the interval is shown in x axes for each species (a, Pinus uncinata; b, Abies alba; c, Fagus sylvatica; d, Pinus sylvestris; e, Quercus robur; f, Quercus petraea). The colour scale shows the significance (p < 0.05) of the Pearson correlation coefficients (blue, significant negative values; red, significant positive values). Figure S6. Significance of the moving window correlations calculated between mean site series of ring-width indices of north, intermediate and south tree populations and the June SPEI drought index at 1-, 3-, 6-, 9-, 12-, 15-, 18-, and 21-month temporal resolutions (y axes). Moving correlations were obtained for 30-year intervals shifted by one year and the middle year of the interval is shown in x axes for each species (a, Pinus uncinata; b, Abies alba; c, Fagus sylvatica; d, Pinus sylvestris; e, Quercus robur; f, Quercus petraea). The colour scale shows the significance (p < 0.05) of the Pearson correlation coefficients (red, significant positive values). |
