Percentage change in canopy shrub volume and shrub density over the experimental period as predicted by mixed-effects logistic growth models (see Fig. 5; Table 1).

The 1977 survey was used as the base case for all comparisons. Positive values show an increase with Sample Period, while negative values show a decline. Note that because Xmid and Scale coefficients for shrub density did not vary with Sample Period, percent change estimates do not vary with distance from water.