1. Department of Animal Ecology Netherlands Institute of Ecology (NIOO‐KNAW) Wageningen The Netherlands
2. Pan‐European Common Bird Monitoring Scheme Czech Society for Ornithology Prague Czech Republic
3. Department of Biology University of Nevada, Reno Reno Nevada
4. Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Seewiesen Germany
5. Plant Ecology and Nature Conservation Group Wageningen University Wageningen The Netherlands