Data accessibility – We will store all collected data at the open research database of ZALF (http://open-research-data-zalf.ext.zalf.de/default.aspx), which is a master data repositories of Web of Science. Data will be freely available as soon as the manuscript is published. DOI will be 10.4228/ZALF + Suffix.
Conflict of interest – The authors declare no conflict of interest.
Author contributions – The study was conceived by KB, LW, MR and LS. Experimental design and data collection was carried out by LS and KB. Specimens were determined by LS (wild bees) and MR (hoverflies). KB analyzed the data and worte the first draft of the manuscript. All co-authors discussed the findings and contributed during the writing process.