FIGURE 1 in Interrelation of Proctodrilus species (Oligochaeta: Lumbricidae) with lessivage and layering in European soil profiles

FIGURE 1. Ecological species separation in the genus Proctodrilus: Soil profiles with two or three co-occurring species, each in a different layer. For further details see text. Bottom right: Generalized scheme of preferred occurrence of Proctodrilus species in the soil profile: close to layer boundaries and in the layer with finer particle size.