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Article
Ülo Väli, AuteurRed Kites Milvus milvus and Black Kites M. migrans, two raptor species, occasionally hybridise in Europe. Yet the ecology of hybrids is virtually unknown. Here, I describe migration patterns of a hybrid offspring of the two species. In 2022, a j[...]
Article
Ülo Väli, Auteur ; Urmas Abel, Auteur ; Renno Nellis, Auteur ; Gunnar Sein, Auteur ; Urmas Sellis, Auteur ; Paweł Mirski, AuteurSpecies coexist only when occupying different ecological niches. We evaluated habitat and trophic niches in two recently diverged hybridizing avian apex predators, the declining Greater Spotted Eagle Clanga clanga (mainly found in contracting we[...]
Article
Ülo Väli, Auteur ; Aigars Kalvāns, Auteur ; Joosep Tuvi, AuteurDispersal and survival are important determinants of population dynamics and should be monitored in both threatened and recovered populations. We used colour ringing with a capture–mark–recapture approach to estimate the age distribution, surviv[...]
Article
Paweł Mirski, Auteur ; Zdzisław Cenian, Auteur ; Mindaugas Dagys, Auteur ; Szilárd Daróczi, Auteur ; Deivis Dementavičius, Auteur ; Grzegorz Maciorowski, Auteur ; Sebastian Menderski, Auteur ; Damian Nowak, Auteur ; Ádám Pongrácz, Auteur ; Mátyás Prommer, Auteur ; Urmas Sellis, Auteur ; Joachim Siekiera, Auteur ; Péter Szinai, Auteur ; Tomasz Tumiel, Auteur ; Janusz Wójciak, Auteur ; Robert Zeitz, Auteur ; Ülo Väli, AuteurDans Ibis (163(2) 2021)Animal home-ranges are expressions of the biology and ecology of a species, and their size is often considered to be a proxy for habitat quality. Understanding the factors affecting variation in home-range size may aid prediction of the impact o[...]
Article
Ülo Väli, Auteur ; Piia Katharina Vaan, AuteurEffective bioindicators of old-growth forest are important for conservation. The Greenish Warbler (Phylloscopus trochiloides viridanus), a forest-dwelling passerine, has been recorded in old-growth forests; however, its precise habitat preferenc[...]
Article
Martin Haase, Auteur ; Henriette Höltje, Auteur ; Beate Blahy, Auteur ; Damon Bridge, Auteur ; Eberhard Henne, Auteur ; Ulf S. Johansson, Auteur ; Katrin Kaldma, Auteur ; Ekaterina A. Khudyakova, Auteur ; Amy King, Auteur ; Aivar Leito, Auteur ; Wolfgang Mewes, Auteur ; Elena A. Mudrik, Auteur ; Ivar Ojaste, Auteur ; Dmitry V. Politov, Auteur ; Ronald Popken, Auteur ; Juhani Rinne, Auteur ; Andrew Stanbury, Auteur ; Jesper Tofft, Auteur ; Ülo Väli, Auteur ; Angela Schmitz Ornés, AuteurFor more than half a century, the Western Eurasian Crane (Grus grus grus) has been expanding its range toward western Europe, recolonizing areas where it had been previously driven to extinction, including the UK, the Netherlands and Denmark. Th[...]
Article
Annika Konovalov, Auteur ; Rein Nellis, Auteur ; Renno Nellis, Auteur ; Am Nurmla, Auteur ; Urmas Sellis, Auteur ; Ülo Väli, Auteur
Article
Ülo Väli, Auteur ; Jaanus Elts, Auteur ; Hannes Pehlak, AuteurCapsule: Transect-based common bird monitoring methods and opportunistic data from citizen scientists are not equal alternatives to mapping of raptors in study plots.Aims: To analyse the efficacy of common breeding and wintering bird monitoring [...]
Article
Ülo Väli, AuteurProper timing of events in the annual cycle is essential for successful breeding in birds, especially in long-distance migrants. In this study, the phenology of the main breeding phases, including arrival at and departure from the nesting site, [...]
Article
Ülo Väli, Auteur ; Joosep Tuvi, Auteur ; Gunnar Sein, AuteurAnthropogenic loss of biodiversity is often indicated by the disappearance of top predators. However, some of them have adapted to man-made agricultural landscapes. Among raptors, one such example is the Lesser Spotted Eagle. We compiled an exha[...]
Article
Rimgaudas Treinys, Auteur ; Uģis Bergmanis, Auteur ; Ülo Väli, AuteurWe assessed whether populations of the migratory, philopatric, territorial Lesser Spotted Eagle Clanga pomarina are regulated through territoriality and density-dependent reproduction rates. In the north-western part of the distribution to the e[...]
Article
Ülo Väli, Auteur ; Uģis Bergmanis, AuteurCapsule: In the migratory Lesser Spotted Eagle Clanga pomarina, colour rings and Global Positioning System transmitters indicated annual survival rates similar to other large raptors, but the rate suggested by wing-tags was significantly lower d[...]
Article
Ülo Väli, Auteur ; Olavi Vainu, AuteurThe Common Buzzard Buteo buteo is a widespread species whose migration pattern differs by subspecies and regionally. Ring recoveries indicated that Buzzards originating from Estonia move southwest and winter in central and western Europe. This s[...]
Article
Māris Strazds, Auteur ; Hans-Günther Bauer, Auteur ; Ülo Väli, Auteur ; Agnese Kukāre, Auteur ; Vadims Bartkevičs, AuteurThe contamination with DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane) and its breakdown products as a potential cause of population decline of Black Stork has been studied in Latvia since 2008. In order to test if contamination is local or [...]
Article
Annika Konovalov, Auteur ; Katrin Kaldma, Auteur ; Andriy Bokotey, Auteur ; Paul Brossault, Auteur ; Frederic Chapalain, Auteur ; Marina Dmitrenok, Auteur ; Natalie Dzyubenko, Auteur ; Urmas Sellis, Auteur ; Māris Strazds, Auteur ; Luc Strenna, Auteur ; Rimgaudas Treinys, Auteur ; Piotr Zieliński, Auteur ; Ülo Väli, AuteurSex ratio is an indicator of population health as unexpected biases may indicate potential threats. We studied nestling sex ratio in Black Stork Ciconia nigra populations in order to check potential biases and differences along east–west and nor[...]
Article
Tobias Langguth, Auteur ; Ann-Christin Honnen, Auteur ; Frank Hailer, Auteur ; Tadeusz Mizera, Auteur ; Stefan Skoric, Auteur ; Ülo Väli, Auteur ; Frank E. Zachos, AuteurWe analysed 120 white-tailed sea eagles Haliaeetus albicilla from eastern (Poland and Estonia) and southeastern (Serbian Danube population) Europe for genetic variability and structuring at the mitochondrial control region and seven nuclear micr[...]
Article
Ülo Väli, Auteur ; Pauli Saag, Auteur ; Valery Dombrovski, Auteur ; Bernd-Ulrich Meyburg, Auteur ; Grzegorz Maciorowski, Auteur ; Tadeusz Mizera, Auteur ; Rimgaudas Treinys, Auteur ; Sofie Fagerberg, AuteurThe correct identification of hybrids is essential in avian hybridisation studies, but selection of the appropriate set of genetic markers for this purpose is at times complicated. Microsatellites and single nucleotide polymorphisms (SNPs) are c[...]
Article
Ülo Väli, Auteur ; Urmas Sellis, AuteurWe analysed migration strategies of the Osprey Pandion haliaetus on the poorly studied Eastern European–East African flyway. Four adult birds were equipped with GPS-based satellite-transmitters or data-loggers in their breeding sites in Estonia [...]
Article
Ivar Ojaste, Auteur ; Aivar Leito, Auteur ; Petri Suorsa, Auteur ; Anders Hedenström, Auteur ; Kalev Sepp, Auteur ; Meelis Leivits, Auteur ; Urmas Sellis, Auteur ; Ülo Väli, AuteurThe majority of Common Cranes (Grus grus) breeding in northern Europe are short- to medium-distance migrants that overwinter in southern Europe, northern Africa, and the Middle East. However, some individuals migrate longer distances to as far a[...]
Article
Ülo Väli, AuteurGreater Spotted Eagle Aquila clanga and Lesser Spotted Eagle Aquila pomarina are hybridising Eurasian raptors, but our knowledge of hybrid fertility is poor. Here, I present a case of interbreeding between a F1 hybrid spotted eagle male and a Le[...]
