Fig. 17

Changes in species richness between even-aged and natural forest plotted against the years since even-aged forest was logged. Positive effect size means more species in even-aged forest than in natural forests. Circles show individual studies. Their radius is proportional to the inverse of the standard errors meaning that larger circles are for more precise studies. A solid line for predicted average species richness is added with 95% confidence intervals. When the 95% confidence intervals do not cross the dotted line, the effect is statistically significant