Figure 1.

(a) The proportion of populations that went extinct over the course of the experiment. Means and 95% confidence intervals are from the model (see Statistics for details). In the favorable environment, extinction did not occur, except in one small, control population. (b) Mean time to extinction (with 95% confidence intervals), focusing on populations that went extinct, for populations maintained in the poor environment only, illustrating the significant interaction in the model between evolution treatment and founding size