Reconstructing spruce budworm outbreak severity: a comparison of paleoecological and tree-ring signals.

The early part of the statement is supported by the presence of areas of high power (red zones; Fig 1 ) that may be significant (thick black line; Fig 1 ) in the individual and cross-wavelet spectra coinciding with the approximately 30-year spruce budworm outbreak cycle (30-year period along the y-axis; Figs 1 and 2 ).

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We observed a highly significant wavelet coherence between the scale and tree-ring records at a one-to-four-year periodicity over the study period ( Fig 3 ).

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