FOAG, Biodiversity for food and agriculture in Switzerland, 2015, p. 6, no 4.1 ([Internet, 2022-11-07](https://www.blw.admin.ch/dam/blw/en/dokumente/Services/Publikationen/Berichte/e_Biodiversity%20for%20food%20and%20agriculture%20in%20Switzerland.pdf.download.pdf/Biodiversity%20for%20food%20and%20agriculture%20in%20Switzerland.pdf))