Changes in Abiotic Drivers of Green Sea Urchin Demographics following the Loss of a Keystone Predator

Figure 2

Boxplots of sea urchin density (a) and biomass (b) per 0.25 m², averaged by island (each facet) for each time period of sea otter status: predecline, end of decline, postdecline 1, and postdecline 2. indicates no data. Barred lines denote passes that separate the island groups shown in Figure 1.