Fig. 2. Biomass and population densities of soil arthropod groups across global biomes.
In each biome and for each group of arthropods, biomass densities (A) or population densities (B) reported in the different sites are binned evenly in log scale. Each bin extends to roughly twice its minimal value. The shading of each bin represents the fraction of datapoints lying in the bin, with the darkest color bin having the highest number of measurements for a specific taxonomic group and biome. Black circles mark the mean density. The dashed lines represent the detection limit, the lowest available nonzero measurement. The biomes are in descending order with respect to their total arthropod biomass density. The area of each biome is given in parentheses in units of millions of square kilometers (1M km2 = 106 km2 = 1012 m2). See Methods for the definitions of biomes.