“…In heterogeneous landscapes consisting of multiple ecosystems types, the size and connectivity of (semi-)natural habitats increase trap-nesting bee and wasp diversity (e.g., Holzschuh et al, 2009;Steffan-Dewenter, 2003) and change species composition (e.g., Morato & Campos, 2000) according to hypotheses derived from island biogeography theory, but the strength of these effects may depend on the specific landscape context (Steckel et al, 2014). Similarly, land-use intensity in agricultural landscapes influences trap-nesting Hymenoptera composition and diversity (e.g., Matos, Sousa-Souto, Almeida, & Teodoro, 2013;Tylianakis, Klein, & Tscharntke, 2005), with less intensive and more varied cropping systems characterized by more bee and wasp species. However, in very intensively farmed areas, trap-nesting bees may depend on mass-flowering crops such as oilseed rape, which can increase bee abundance (e.g., Diekötter, Peter, Jauker, Wolters, & Jauker, 2014;Holzschuh, Dormann, Tscharntke, & Steffan-Dewenter, 2013).…”