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The total amount of volatiles (ng) emitted by Control (n = 15), herbivore-induced (n = 15), and MeJA-treated (n = 15) Pyrenean oaks at a study site in an oak forest of Guadarrama Mountains, Spain. Treatments with significantly different amounts of volatiles are marked by asterisks (*** p < 0.001, ** p < 0.01); results of chisq test. White circles show VOCs emitted by each individual tree.
