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Documents disponibles écrits par cet auteur (25)
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Article
Yuichi Yamaura, Auteur ; Heiko Schmaljohann, Auteur ; Akira Unno, Auteur ; Kazuhiro Kawamura, Auteur ; Munehiro Kitazawa, Auteur ; Shigeho Sato, Auteur ; Daisuke Aoki, Auteur ; Yuji Okahisa, Auteur ; Masayuki Senzaki, AuteurWhile many long-distance migratory birds are experiencing severe population declines, some species showed abundance increases and range expansions. Knowledge of migratory routes may provide key insights into these variations of population dynami[...]
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Dominic V. Cimiotti, Auteur ; Luke Eberhart-Hertel, Auteur ; Aurélien Audevard, Auteur ; Pere Joan Garcias Salas, Auteur ; Guillaume Gelinaud, Auteur ; Klaus Günther, Auteur ; Afonso Rocha, Auteur ; Rainer Schulz, Auteur ; Jan van der Winden, Auteur ; Heiko Schmaljohann, Auteur ; Clemens Küpper, AuteurDispersal is an important behavioral process that plays a significant role in, among others, speciation, population viability, and individual fitness. Despite progress in avian dispersal research, there are still many knowledge gaps. For example[...]
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Martha Maria Sander, Auteur ; Wieland Heim, Auteur ; Heiko Schmaljohann, AuteurIn contrast to the rapidly growing body of knowledge on migratory routes, wintering grounds and timing of annual life cycle events of migratory birds, knowledge on how migratory songbirds refuel at stopover sites along the Asian–Australasian fly[...]
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Nathalie Kürten, Auteur ; Oscar Vedder, Auteur ; Jacob González-Solís, Auteur ; Heiko Schmaljohann, Auteur ; Sandra Bouwhuis, AuteurLight-level geolocators are increasingly popular devices for tracking migratory birds. However, to ensure that data on migratory behaviour represent natural behaviour that is not affected by potentially harmful effects of carrying such a device,[...]
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Cas Eikenaar, Auteur ; Florian Packmor, Auteur ; Heiko Schmaljohann, Auteur ; Arne Hegemann, AuteurStopover periods in between migratory flights determine the speed of migration and as such may affect birds’ fitness. The decision to leave a stopover site is affected by, for example, energy stores and weather conditions. We investigated whethe[...]
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Heiko Schmaljohann, Auteur ; Florian Müller, Auteur ; Thomas Klinner, Auteur ; Cas Eikenaar, AuteurIn migratory songbirds, older individuals are thought to be more efficient migrants than younger individuals. Age-specific differences in migratory efficiency have been reported mainly in respect of arrival timing, energy stores, rate of energy [...]
Article
Manuel Schweizer, Auteur ; Hadoram Shirihai, Auteur ; Heiko Schmaljohann, Auteur ; Guy M. Kirwan, AuteurEmberiza striolata has traditionally been viewed as a single polytypic species, but recent taxonomic reviews of its morphology, vocalizations and genetic data have led to the recommendation that two species be recognized within this complex, the[...]
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Dennis Röseler, Auteur ; Heiko Schmaljohann, Auteur ; Franz Bairlein, AuteurWe used light-level geolocation to study the migration and wintering grounds of a short-distance diurnal migrant, the Linnet Carduelis cannabina, which breeds on the German island of Helgoland. Of 61 light-level geolocators deployed during the 2[...]
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Peter H. Becker, Auteur ; Heiko Schmaljohann, Auteur ; Juliane Riechert, Auteur ; Götz Wagenknecht, Auteur ; Zuzana Zajková, Auteur ; Jacob González-Solís, AuteurWe studied the temporal–spatial distribution of Common Terns Sterna hirundo along the East Atlantic Flyway. In 2009 and 2010 experienced adults from a colony on the German North Sea coast were tagged with geolocators recording light intensity an[...]
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Cas Eikenaar, Auteur ; Heiko Schmaljohann, AuteurA variety of methods have been used to study the relationship between wind conditions and departure decisions of migrant birds at stopover sites. These methods are either costly or suffer from inaccuracy in determining whether or not an individu[...]
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Cas Eikenaar, Auteur ; Heiko Schmaljohann, AuteurA variety of methods have been used to study the relationship between wind conditions and departure decisions of migrant birds at stopover sites. These methods are either costly or suffer from inaccuracy in determining whether or not an individu[...]
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Heiko Schmaljohann, Auteur ; Felix Liechti, Auteur ; Bruno Bruderer, AuteurPasserine migrants are usually divided into diurnal and nocturnal migrants. When crossing the Sahara it was expected that nocturnal migrants would continue their flight into the day. We investigated whether migration taking place in the Sahara d[...]
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Felix Liechti, Auteur ; Heiko Schmaljohann, Auteur
Article
Heiko Schmaljohann, Auteur ; Beat Naef-Daenzer, Auteur1. An innate migration strategy guides birds through space and time. Environmental variation further modulates individual behaviour within a genetically determined frame. In particular, ecological barriers could influence departure direction and[...]
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Julia Delingat, Auteur ; Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Bettina Mendel, Auteur ; Franz Bairlein, AuteurDans Ardea (94(3) 2006)Selection for early arrival is expected to shape optimal stopover decisions in migrating birds to minimise time spent on migration. Optimality models predict that fuel loads at departure from stopover sites and stopover duration should depend st[...]
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Julia Delingat, Auteur ; Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Franz Bairlein, AuteurIn migrating birds body mass change during stopover is often used to evaluate the quality of a stopover site. Because such body mass changes are difficult to survey in migrating birds various methods were developed to allow the analysis of large[...]
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Cas Eikenaar, Auteur ; Arseny Tsvey, Auteur ; Heiko Schmaljohann, AuteurA widespread phenomenon in migrant birds is that they travel faster in spring than in autumn. During migration birds spend most time at stopover sites and, correspondingly, the faster spring migration is mainly explained by shorter stopovers in [...]
Article
Heiko Schmaljohann, Auteur ; Felix Liechti, Auteur ; Bruno Bruderer, AuteurLesser black-backed gulls Larus fuscus migrate regularly along coastlines or the Nile to their wintering grounds in sub-Saharan Africa. They usually avoid the interior of the Sahara, but occur occasionally far inland when moving upstream along r[...]
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Julia Delingat, Auteur ; Keith A. Hobson, Auteur ; Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Franz Bairlein, AuteurLinking events of breeding, wintering and stopover areas has important ecological and conservation implications for migratory species. To find a tool to connect these different events in a long-distance migrating songbird, the Northern Wheatear [...]
Article
Heiko Schmaljohann, Auteur ; Philipp J. J. Becker, Auteur ; Hakan Karaardic, Auteur ; Felix Liechti, Auteur ; Beat Naef-Daenzer, Auteur ; Celia Grande, AuteurStopover studies have concentrated so far mostly on mechanisms regulating the temporal organisation on the day-to-day level. Taking advantage of the small and isolated island of Helgoland in the North Sea, we investigated the stopover and depart[...]
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Heiko Schmaljohann, Auteur ; Felix Liechti, Auteur ; Erich Baechler, Auteur ; Thomas Steuri, Auteur ; Bruno Bruderer, AuteurBesides the scientific interest in the quantification of bird migration, there is an increasing need to quantify bird movements for the assessment of bird collision risk with artificial structures. In many environmental impact studies, the radar[...]
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Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Annegret Walter, Auteur
Article
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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Juan Arizaga, Auteur ; Heiko Schmaljohann, Auteur ; Franz Bairlein, AuteurArizaga J., Schmaljohann H. & Bairlein F. 2011. Stopover behaviour and dominance: a case study of the Northern Wheatear Oenanthe oenanthe. Ardea 99: 157-165. In migrants that occupy and defend territories during migration, social status can dete[...]
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Yuichi Yamaura, Auteur ; Heiko Schmaljohann, Auteur ; Simeon Lisovski, Auteur ; Masayuki Senzaki, Auteur ; Kazuhiro Kawamura, Auteur ; Yuzo Fujimaki, Auteur ; Futoshi Nakamura, AuteurThe East Asian-Australian Flyway spans from north Asia to Australia and is the world's richest birds' flyway because it involves > 40% of global migratory bird species. However, information is lacking on individual migratory routes and non-breed[...]
