Fig. 2

Median number (± median absolute deviation) of plastic items (size 1: blue line, size 2: orange line; size 3: grey line) on the surface of native moss samples and moss bags after incubation at different concentrations of plastics items expressed as weight/volume percentage (low, 0.055%; intermediate, 0.11%; high, 0.22%). The same letters indicate statistically homogeneous subgroups (lower case letters for item concentration data and upper-case letters for item size data)