Boxplots comparing probability of occurrence of four soil crust species among wind power classes. The box length is determined by the interquartile range, i.e., the 25th and 75th percentiles. The central tendency is shown by the median. The whiskers show the 5th and 95th percentiles. Outliers exceeding 1.5 interquartile ranges from the mean are shown by circles. Wind power classes with the same letter are not significantly different by a permutation test (p > 0.001); the comparisons are made within land use category and species.