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Documents disponibles écrits par cet auteur (26)
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Article
Volker Salewski, Auteur ; Luis Schmidt, AuteurIdentifying the fate of birds’ nests and the causes of breeding failure is often crucial for the development of conservation strategies for threatened species. However, collecting these data by repeatedly visiting nests might itself contribute t[...]
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Dina Abdelhafez Ali Mostafa, Auteur ; Mikkel Willemoes, Auteur ; Volker Salewski, Auteur ; Troels Eske Ortvad, Auteur ; Torben Dabelsteen, Auteur ; Kasper Thorup, AuteurIn migratory birds, constraints due to breeding are relaxed during the non-breeding season and thus, social behaviours and spatial associations are potentially more directly coupled to food resources and habitats. Use of space and territorial be[...]
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Volker Salewski, Auteur ; Martin Flade, Auteur ; Simeon Lisovski, Auteur ; Anatolii Poluda, Auteur ; Oleksander Iliukha, Auteur ; Grzegorz Kiljan, Auteur ; Uladzimir Malashevich, Auteur ; Steffen Hahn, AuteurBirds that are long-distance migrants partition their annual cycle among a number of locations over a large spatial range. The conservation of these species is particularly complex because it requires attention to a number of different and dista[...]
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Volker Salewski, Auteur ; Luis Schmidt, AuteurThe reproductive success of many declining meadow bird species is too low to maintain populations, and predation of chicks and eggs is often the main reason for breeding failure. We installed cameras at nests of one of these species, the Black-t[...]
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Dieter Hiemer, Auteur ; Volker Salewski, Auteur ; Wolfgang Fiedler, Auteur ; Steffen Hahn, Auteur ; Simeon Lisovski, AuteurThe Blackcap Sylvia atricapilla is a model species for the evolution of bird migration in a time of global change. However, many assumptions about putative changes to their migratory paths have not been verified because, until recently, it has n[...]
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Peter Jones, Auteur ; Volker Salewski, Auteur ; Juliet Vickery, Auteur ; Isaac Mapaure, AuteurCapsule Migrant Willow Warblers occupy more woodland types and occur at higher densities than ecologically-similar resident Afrotropical warblers. Aims To compare population densities of Willow Warblers and eremomelas in adjacent acacia, mopane [...]
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Peter Jones, Auteur ; Volker Salewski, Auteur ; Juliet Vickery, Auteur ; Isaac Mapaure, AuteurCapsule Migrant Willow Warblers occupy more woodland types and occur at higher densities than ecologically-similar resident Afrotropical warblers. Aims To compare population densities of Willow Warblers and eremomelas in adjacent acacia, mopane [...]
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Volker Salewski, Auteur ; Bettina Almasi, Auteur ; Agneta Heuman, Auteur ; Marco Thoma, Auteur ; Adrian Schlageter, AuteurRecords of interspecific agonistic behaviour of Palaearctic passerine migrants from their Afrotropical wintering grounds are rare. There are, however, no detailed observations from stopover sites where individuals might concentrate and depress r[...]
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Volker Salewski, Auteur ; Michael Schaub, AuteurBirds on migration spend much more time on stopover sites to refuel for the next migration step than aloft, but empirical data on stopover duration are rare, especially for Palearctic trans-Sahara migrants whilst crossing the desert. Previous st[...]
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Volker Salewski, Auteur ; Res Altwegg, Auteur ; Amadou Ba, Auteur ; Felix Liechti, Auteur ; Dieter Peter, AuteurMass and fat scores of Palearctic Trans-Saharan migrants are known in breeding grounds and migration routes north of the Sahara and partially in their winter quarters. However, there are no data from areas south of the Sahara desert. These data [...]
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Volker Salewski, Auteur ; Wesley M. Hochachka, Auteur ; Heiner Flinks, AuteurDeclining body size has been suggested to be a response of animals to global warming, but analyses of time series have led to contradictory results. One problem is that each trait related to body size may vary in response to factors other than t[...]
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Martin Flade, Auteur ; Ibrahima Diop, Auteur ; Martin Haase, Auteur ; Arnaud Le Nevé, Auteur ; Steffen Oppel, Auteur ; Cosima Tegetmeyer, Auteur ; Anna Vogel, Auteur ; Volker Salewski, AuteurThe Aquatic Warbler Acrocephalus paludicola (AW) is the only globally threatened passerine species of continental Europe. The global population decreased by > 90% during the 20th century. AWs breed in Palaearctic fen mires and sedge meadows and [...]
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Volker Salewski, Auteur ; Marc Kéry, Auteur ; Marc Herremans, Auteur ; Felix Liechti, Auteur ; Lukas Jenni, AuteurFat is the prime energy source for birds during prolonged exercise, but protein is also catabolized. Estimates of the amount of catabolizable fat and protein (termed fat and protein fuel) are therefore important for studying energetics of birds.[...]
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Bruno Bruderer, Auteur ; Volker Salewski, AuteurWe use widely supported handbook data on annual fecundity (clutch size 9 annual number of normal broods) to obtain indications related to the relative costs of long-distance migration compared to lower levels of migratoriness. Our examples show [...]
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Heike Ellrich, Auteur ; Volker Salewski, Auteur ; Wolfgang Fiedler, AuteurSex determination of birds is important for many ecological studies but is often difficult in species with monomorphic plumage. Morphology often provides a possibility for sex determination, but the characters need to be verified. We tested whet[...]
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Volker Salewski, Auteur ; Bettina Almasi, Auteur ; Adrian Schlageter, AuteurNectarivory of long-distance Palearctic migrants is known from Europe but there are few reports of nectar as a resource for migrants in Africa. Migrants feeding on nectar were regularly observed in the oasis of Ouadane, a stopover site in the we[...]
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Susanne Jenni-Eiermann, Auteur ; Bettina Almasi, Auteur ; Ivan Maggini, Auteur ; Volker Salewski, Auteur ; Bruno Bruderer, Auteur ; Felix Liechti, Auteur ; Lukas Jenni, AuteurTwice a year, songbirds breeding in the Western Palaearctic cross the largest desert of the world, the Sahara, to reach their African winter quarters. Recently, a radar study quantified this migration and demonstrated that almost all passerines [...]
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Volker Salewski, Auteur ; Herbert Stark, Auteur ; Bernd Leisler, AuteurBoth Western Olivaceous Warbler Hippolais opaca and Eastern Olivaceous Warbler H. pallida, of the form reiseri, occur in Morocco. The distribution of Western Olivaceous Warbler in the northern parts of the country is well known. Eastern Olivaceo[...]
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Volker Salewski, Auteur ; Franz Bairlein, Auteur ; Bernd Leisler, Auteurone of the main questions of former studies on the wintering ecology of long distance migrants is how migrants partition resources with residents in their winter quarters and to what extent competition between the two groups plays a role for the[...]
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Heiner Flinks, Auteur ; Volker Salewski, AuteurWing and tail length measurements are important tools in ornithology. Amongst linear measurements, wing length has been considered to be the best indicator for body size for taxonomy and ecomorphology, as well as for studies about the impact of [...]
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Volker Salewski, Auteur ; Franz Bairlein, Auteur ; Bernd Leisler, Auteur
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Volker Salewski, Auteur ; Franz Bairlein, Auteur ; Bernd Leisler, AuteurWe studied the remigial molt of six Spotted Flycatchers in their winter quarters in Ivory Coast, West Africa. Molt was evident between November and March, with very variable starting dates. Most remiges molted in the dry season when the potentia[...]
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Volker Salewski, Auteur ; Franz Bairlein, Auteur ; Bernd Leisler, AuteurBetween spring 1994 and spring 1997 329 birds of 15 Palearctic passerine species and the Wryneck (Jynx torquilla) were ringed in the Comoe National Park, Ivory Coast. The species which were caught most frequently were Willow Warbler (Phylloscopu[...]
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Volker Salewski, Auteur ; Heiko Schmaljohann, Auteur ; Felix Liechti, AuteurThe strategy of migrants crossing the Sahara desert has been the subject of debate, but recent evidence from radar studies has confirmed that most passerines use an intermittent migration strategy. The latter has also been suggested from previou[...]
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Volker Salewski, Auteur ; Marco Thoma, Auteur ; Michael Schaub, AuteurAnalyses of stopover parameters of migrating birds with Cormack-Jolly-Seber (CJS) capture-recapture models often suffer from low precision due to sparse data sets. Low recapture rates result in low power to detect violations of the underlying as[...]
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Volker Salewski, Auteur ; Martin Flade, Auteur ; Anatolii Poluda, Auteur ; Grzegorz Kiljan, Auteur ; Felix Liechti, Auteur ; Simeon Lisovski, Auteur ; Steffen Hahn, AuteurThe globally-threatened Aquatic Warbler (Acrocephalus paludicola) breeds in Europe and spends the northern winter in sub-Saharan West Africa. We attached 30 geolocators to breeding birds in the central Ukraine in 2010. Three geolocators which co[...]
