1. a Royal Society for the Protection of Birds , The Lodge, Sandy, Bedfordshire, SG19 2DL, UK
2. b OTOP-BirdLife Poland, ul. Odrowąża 24, 05–270 Marki , Poland
3. c Universität Greifswald, Institut für Botanik und Landschaftsökologie , Grimmer Str. 88, 17487, Greifswald, Germany
4. d Institute for Environment and Sustainability, Joint Research Centre of the European Commission , TP 440, 1–2120, Ispra, Italy
5. f International Rice Research Institute , DAPO BOX 7777, Metro Manila, Philippines
6. e BirdLife International Aquatic Warbler Conservation Team, Brandenburg State Office for Environment , Tramper Chaussee 2, 16225, Eberswalde, Germany