FIGURE LEGENDS

Figure 1. (a) Number of groups in the main study area (N ) by year (solid points). Dashed line is the regression of N on year; shaded area the 95% confidence interval (CI) of the regression. Also listed is the Pearson correlation (r ) and of N by year. (b) Mean (± 95% CI) Pearson correlation of N by year depending on the length of the study (6 to 51 years). (c) Mean (± 95% CI) Pearson correlation of N by year depending on the year the study was initiated (including studies of all lengths).

Figure 2. (a) Mean group size of groups in the main study area (xGS ) by year (solid points). Dashed line is the regression ofxGS on year; shaded area the 95% confidence interval (CI) of the regression. Also listed is the Pearson correlation (r ) ofxGS by year. (b) Mean (± 95% CI) Pearson correlation ofxGS by year depending on the length of the study (6 to 51 years). (c) Mean (± 95% CI) Pearson correlation of xGS by year depending on the year the study was initiated (including studies of all lengths).

Fig. 1