Nine decades of changing insect diversity in Switzerland expose a striking divide

Thanks to a historical data archive, Swiss researchers are able to draw conclusions about the changes in the diversity of two insect groups over the past 90 years. The study, led by Agroscope, identified a significant decline in butterflies and deadwood beetle species around the middle of the 20th century. These groups live predominantly in agricultural and forest habitats. However, the study also shows that the number of species has since risen in some areas.