Linear regressions between canopy coverage and nutrient-related variables.

Linear regression for the pre-collapse period 1991–2013, red-dotted lines indicate the confident intervals; R² indicates the explained variance and the color indicates the year. (A) Summer kelp canopy extent north of Point Arena and winter SSTN14; summer kelp canopy extent south of Point Arena and (B) winter SSTN14, (C) spring BEUTI37N. Regressions details are in Table 2. SSTN14: sea surface temperature at buoy N14, BEUTI37N: BEUTI index at 37°N.