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Fig. 1


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Box plots with standard deviation (±SD) of the mean monthly values of the relative growth rates (RGR) for the six species. Different letters indicate significant differences (p < 0.05). ANOVA results: N. officinale: F(4,45) = 55.83, p < 0.0001, V. beccabunga: F(4,45) = 34.93, p < 0.0001, B. erecta: F(4,45) = 4.49, p = 0.0039, R. hederaceus: F(4,42) = 34.160, p < 0.0001, G. fluitans: F(4,44) = 0.48, p = 0.75, B. umbellatus F(3,33) = 59.92, p < 0.0001.

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