Figure 2

Ratios of census sizes in the stressful environment to those in the permissive environments for each diversity class after three weeks in the selective environment (left box plot) and at the end of the experiment (right box plot). The box plots enclose the central two quantiles and show the group medians. Only the 1x and 2x treatments are significantly distinguishable using the Wilcoxon signed rank test. The inset shows the average percent decline in census size in the stressed populations relative to the control populations at the end of the experiment.