Field data: effect of plant diversity on insect abundance.

Plant abundance and diversity (H  =  Shannon index), herbivore (Mecinus pascuorum) and parasitoid (Mesopolobus incultus) abundance are shown recorded in the three regions in Germany. Central tendencies (a mean (SE), b median (interquartile ranges)), number of plots (N), and ranges for the explanatory and the response variables are given for each region.