[1] Polish Acad Sci, Inst Nat Conservat, Mickiewicza 33, PL-31120 Krakow, Poland
[2] Estn Biol Donana CSIC, Av Amer Vespucio S-N, Seville 41092, Spain
[3] German Ctr Integrat Biodivers Res iDiv, Deutcher Pl 5E, D-04103 Leipzig, Germany
[4] Max Planck Inst Ornithol, Obstberg 1, D-78315 Radolfzell am Bodensee, Germany
[5] Slovak Wildlife Soc, POB 72, Liptovsky Hradok 03301, Slovakia
[6] ARCTUROS Civil Soc Protect & Management Wildlife, Aetos 53075, Florina, Greece
[7] Univ Ljubljana, Biotech Fac, Jamnikarjeva 101, Ljubljana 1000, Slovenia
[8] Univ Zagreb, Fac Vet Med, Heinzelova 55, Zagreb 10000, Croatia
[9] Generalitat Catalunya, Biodivers & Anim Protect Serv, Dr Roux 80, Barcelona 08017, Spain
[10] Inst Ecol & Earth Sci, Vanemuise 46, EE-51014 Tartu, Estonia
[11] Univ Roma La Sapienza, Viale Univ 32, I-00185 Rome, Italy
[12] Prov Autonoma Trento Serv Foreste & Fauna, Via Trener 3, I-38100 Trento, Italy
[13] Balkani Wildlife Soc, Blvd Dragan Tzankov 8, Sofia 1164, Bulgaria
[14] Junta Castilla & Leon, Serv Terr Medio Ambiente Leon, Av Peregrinos S-N, Leon 24008, Spain
[15] ONCFS CNERA PAD, Equipe Ours, F-31800 Villeneuve De Riviere, France
[16] Natl Acad Sci Ukraine, Schmalhausen Inst Zool, 15 Bogdan Khmelnitsky, UA-01601 Kyev 30, Ukraine
[17] State Nat Conservancy Slovak Republ, Tajovskeho 28B, Banska Bystrica 97401, Slovakia
[18] Latvian State Forest Res Inst Silava, Rigas Str 111, LV-2169 Salaspils, Latvia
[19] Slovenia Forest Serv, Vecna Pot 2, SI-1000 Ljubljana, Slovenia