Figure 1. Effects of plant genetic diversity on different trophic groups of arthropods. Error bars represent 95% confidence intervals. Numbers next to error bars indicate number of studies in each category. Numbers in parentheses are Rosenberg’s fail-safe numbers which indicate how many additional studies with effect size of 0 and of the same weight as the average of those already being used would need to exist to reduce the significance of the mean effect to 0.05. Effects are considered significantly different from 0 if 95% confidence intervals do not cross 0 (dashed line).