Figure 2. Over 98% of all grazing waterfowl was feeding in hollows (A), whereas hollows covered only 52% of the entire 1-hectare area (χ² = 106.89, df = 1, p<0.001).

Visual observations showed obvious grazing scars in the hollows (B): trampling and beak marks, uprooted plants, floating leaves, and a removal of seagrass up to 90% of the original biomass. Hummocks, in contrast, were minimally impacted.