Fig. 2

Spatial distribution of the 12 most widely distributed myrmecophile species in the community (present in more than 10 pitfalls). The pitfalls along the spatial gradient have been grouped in seven different distance bins: ‘intranidal’ (Npitfalls = 24), ‘periphery’ (0 m, Npitfalls = 75) and five distance bins of outside pitfalls (‘< 3 m’: Npitfalls = 54, ‘3 m–6 m’: Npitfalls = 27, ‘6 m–12 m’: Npitfalls = 45, ‘12 m–18 m’: Npitfalls = 45, ‘> 18 m’: Npitfalls = 9). For each distance bin, the proportion of pitfalls with 0, 1, 2–3, 4–5, 6–10, 11–20 and more than 20 individuals of a particular species is indicated with a multicolored stacked bar. The left y-axis shows the proportional distribution of these abundance classes along the distance gradient (x-axis). For each species, we also plotted the average abundance ± SE of individuals in a pitfall per distance bin with black-bordered circles. The y-axis corresponding to these average abundances is given on the right