Fig. 1

Myriophyllum aquaticum growth in tested sediments compared to the long-term laboratory control. a Relative growth rate based on whorl fresh weight, b shoot fresh weight, c root fresh weight (Samples A1–5: artificial sediments with various organic matter, sand and fine particle content. Natural samples: T6–14 river Tamiš; J15 river Jegrička; K16 river Krivaja; L17–19 lake Ludaš. RGR, relative growth rate based on whorl fresh weight. [*Significantly different from the long-term control (one-way ANOVA followed by t test, p ≤ 0.05)]. All data on plant responses compared to test control and the long-term control are available in Additional file 1: Table S3)