Fig. 1

a Mean density of two rodent species, bank vole and wood mouse per plot. Solid arrows indicate events of acorn supplementation (November and January); dashed arrows indicate when monthly removal of rodents started (September 2012) and ended (December 2014). b Box plots of rodent density per plot for each treatment (data from 2013 and 2014). The lower and upper hinges correspond to the first and third quartiles (the 25th and 75th percentiles). The upper whisker shows the largest value no further than 1.5 * IQR from the hinge (where IQR is the inter-quartile range, or distance between the first and third quartiles) and the lower whisker shows the smallest value at most 1.5 * IQR of the hinge. The differences in the rodent density between the treatments was calculated based on the mean (black dot) with the Wilcoxon test and the overall difference is statistically significant (P < 0.0001). The diagram shows also the median observation (solid horizontal line)