Martin Weggler: [Waseverything better in the past? A review of changes in distributional area and population size of Swiss breeding birds 1950–2020]
Based on data from four atlas projects and the Swiss Bird Index®, the changes in the distribution and population of breeding birds in Switzerland are summarised for all breeding bird species. For the three and seven decades (1990-2020 and 1950-2016, respectively), the species with a positive range or population trend clearly outnumber the others. This finding does not correspond to a frequently expressed assessment that the "bird world" in Switzerland has never been as bad as it is today. Possible reasons for the discrepancy are discussed