Climate indirectly modulates tree survival of spruce beetle attacks via effects on constitutive and induced secondary metabolites.

Although we did not detect a significant relationship between entry hole density and monoterpene concentration at the individual tree level, colonized trees exhibited a stronger induction compared to uncolonized trees (though the difference was marginally significant).

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Testing fold-change during the flight period also revealed a highly significant effect, indicating that each unit increase in induction fold-change during the flight period was associated with more than a twofold increase in the odds of survival.

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There was not a significant relationship between annual precipitation and mean phloem monoterpene concentrations (p-value = 0.07, Supplementary Table 3 ), though a negative trend was evident.

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