Fig 4. Chemical similarity within bee-collected resin samples.

Chemical similarity of A) all resin samples collected by returning resin foragers (n = 39), B) only “ocher” samples (n = 14) and C) only “orange” and “red” samples (n = 15); ordination Figure from non-metrical three-dimensional scaling (NMDS) based on Bray-Curtis dissimilarities (stress value = 0.15). Different symbols represent different resin types (closed circle, “brown”; closed diamond, “ocher”; closed triangle, “orange”; open triangle, “red”; star, “yellow”; open circle, “clear”; open square, “whitish”) in A) and different sampling sites (closed circle, “Ez”; closed diamond, “Et”; closed triangle, “Lg”; open triangle, “Gr”; open circle, “Ml”; open square, “Ol”; for meaning of abbreviations see Table 1) in B) and C).