Fig. 3: Urchin invasion dynamics and overgrazed barrens by depth and reef type in eastern Tasmania.
From: Climate-driven invasion and incipient warnings of kelp ecosystem collapse
Change in C. rodgersii abundance (a–c), and barrens cover (d–f) by substratum type and depth category (4–18 m depth) pooled for sites 1–9 in each period, box plots as per Fig. 2. Data are densities derived from 5 m2 quadrats assessed by divers and averaged for quadrats dominated (>50% cover) by a particular substratum type within 2 m depth categories, depths shown represent the ceilings of each category; n quadrats within each category for both urchin abundance (a–c) and barrens cover (d–f) are shown in parentheses above boxes in (a–c) with each period separated by comma. Source data are provided as a Source Data file.
