Supplementary Material

Table S1. Basic characteristics of the jute sites during the experiment. L = lower and H = higher density of jute matting, NA = missing data due to loss of localities. Degradation: 0 = no sign of degradation, 1 = disintegrates on contact, 2 = partially degraded, 3 = completely degraded; sediment: 0 = no visible changes, 1 = slight change in color, 2 = considerable change in color; gas evolution: 0 = almost none: no visible gas bubbles/no buckling in the matting, 1 = some: low emissions of gas/little buckling in the matting, 2 = high: frequent gas emissions/increased buckling, 3 = very high: large and frequent gas emissions/affected areas are floating; sedimentation: 0 = no sign of sedimentation, 1 = partially covered, 2 = still visible, 3 = completely covered; and sedimentation thickness.

Figure S1. Common macrophyte density in Velký Bolevecký pond.

Figure S2. Jute density and macrophyte species Elodea canadensis (top panels) and Myriophyllum spicatum (bottom panels) as abundance (a, b) and length (c, d) of fragments during time. Open and grey boxplots denote to low (L) and high (H) density, respectively. Significant differences between the materials at given month are marked by asterisk, non-significant ones by ‘NS’. Different letters denote significant difference (p < 0.05) between months at given material (L = small letters, H = small letters in italics). Box limits correspond to upper and lower quartiles, horizontal bar to the median, and points show outliers outside the 1.5 times interquartile range among specie.

Figure S3. Macrophyte species cover in the control plots. Different letters denote significant difference (p < 0.05).

Figure S4. Macrophyte length among species (A), sites (B), and in time (C) in the control plots. Different letters denote significant difference (p < 0.05).

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