Trap nests (eigth traps per plot; four traps each attached to a wooden post; located at two randomly selected corners the corners of the central 10 x 10 m subplot; traps belonging to the same wooden post in a plot are marked with a "-" or left without such a mark) were used to collect solitary bees and wasps in SIte A. Abundance and species richness of bees and wasps allow to test to what extent woody plant species richness affects the abundance, species composition and diversity of, e.g. predators (which might profit from higher structural diversity or better resource availability in more plant diverse plots) or pollinators (which might profit from more diverse flower resources). Traps consisted of plastic tubes (diameter 12.5 cm, length 22 cm) that were filled with dried internodes of the ree Arundo donax L. (2-20 mm diameter). Trap nests were exposed from August 2011 to June 2013. All trap nests were monthly checked for nests of solitary bees and wasps that were reared in the laboratory till hatching. Taxa were first sorted to morphospecies and then identified to species level with the help of taxonomic experts whenever possible.

Trap nests (eigth traps per plot; four traps each attached to a wooden post; located at two randomly selected corners of the central core area)

Main Experiment Site A 29°08'-29°11'N 117°90'-117°93'E

August 2011 - June 2013

Solitary cavity-nesting Hymenoptera

The data allow to test to what extent woody plant species richness affects the abundance, species composition and diversity of, e.g. predators (which might profit from higher structural diversity or better resource availability in more plant diverse plots) or pollinators (which might profit from more diverse flower resources) --- As in Hymenoptera most ecological information is shared between members of a family, the family names are provided as separate data colum. ---- Individual numbers presented are brood cell numbers, i.e. the number of brood cells provisioned by each species in a given trap.