Table 2.

Dendrochronological statistics of tree-ring width series for the studied trees and defoliation classes calculated considering the common 1985–2008 period (values are means ± SE).

Species	Defoliation class (code)	Tree-ring width (mm)	First-order autocorrelationa	Mean sensitivitya
Scots pine (Pinus sylvestris)	Severe defoliation (D)	1.93 ± 0.06a	0.75 ± 0.05a	0.38 ± 0.04b
	Intermediate defoliation (I)	2.30 ± 0.12b	0.75 ± 0.08a	0.32 ± 0.03b
	Scarce or no defoliation (N)	2.32 ± 0.07b	0.83 ± 0.02b	0.27 ± 0.04a
Black pine (Pinus nigra)	Severe defoliation (D)	1.52 ± 0.05a	0.77 ± 0.05	0.36 ± 0.01b
	Intermediate defoliation (I)	2.20 ± 0.13b	0.75 ± 0.05	0.31 ± 0.02a
	Scarce or no defoliation (N)	2.22 ± 0.14b	0.73 ± 0.05	0.30 ± 0.02a

Statistics refer to raw data excepting mean sensitivity which was calculated considering residual indices. Different letters show significant differences (P < 0.05) between defoliation classes within each species according to S-N-K post-hoc tests.

^aThe first-order autocorrelation of raw ring-width data measures how much the ring width in year n is correlated with the width in year n-1; the mean sensitivity of residual tree-ring width series measures the relative year-to-year variability in width of consecutive tree rings.