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Mean number (+S.E.) of herbivores on native and non-native plants of Datura stramonium at two experimental sites: Atlixco (A,C,E) and Teotihuacán (B,D,F). Significant effects are indicated, and different letters within a panel indicate significant differences between populations (p ≤ 0.05) according to post hoc t-tests (see also Table S1). Range = Between ranges (Mexico/native, Spain/non-native); Pop = between populations within range; Fam = among families within population.
