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Fig. 1


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Production (g m−2 day−1) in % seeded macrophytes according to level of seeding. Lm: Lemna minor; Af: Azolla filiculoides; Sm1: Salvinia molesta type1; Sm2: Salvinia molesta type 2; Ec: Echhornia crassipes. Data are expressed as the median and 25% and 75% quartiles. Treatments with the same letter indicate no difference between seeding levels for a given taxon (P = Kruskal–Wallis ANOVA on ranks for Ec; Mann–Whitney rank sum test for all other macrophytes).

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