Figure 4.
Concentrations of marine microdebris in surface water tows. Median concentration of marine microdebris, for (a) fibres and (b) particles, in 22 surface water tows conducted near inshore (n = 11) and offshore (n = 11) reef locations in the central region of the Great Barrier Reef World Heritage Area, Australia, 2016. Microdebris is classified as total, synthetic, semi-synthetic, and naturally-derived items. Whiskers show non-outlier range; * and **indicate significant differences using Mann-Whitney U-Test.