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Rapid evolution of reproductive output (total achene number). Means are shown ± 1 SE for 26–29 genotypes per collection year pooled from three field populations. Vertical arrows indicate significant main effect of Year in full anova (see Table 1). Asterisks indicate significant effect of Year within each treatment (see Data analysis). ***P < 0.001; **P < 0.01; *P < 0.05; †P ≤ 0.10.
