1. Department of Vertebrate Zoology Faculty of Biology Saint Petersburg State University St Petersburg Russia
2. Department of MigrationMax Planck Institute of Animal Behavior Radolfzell Germany
3. Wageningen Environmental Research Wageningen Netherlands
4. The Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo St Petersburg Russia
5. Biological Station “Rybachy”Zoological Institute of the Russian Academy of Sciences Rybachy Russia