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Article
Lukas Jenni, AuteurThe Brambling Fringilla montifringilla combines several special features of migration and wintering: differential migration according to age and sex groups, large differences in winter densities as a response to food availability, and flocking b[...]
Article
Lukas Jenni, Auteur ; Gabriele Hilke Peter, AuteurUsually, some measurements are taken from birds caught for ringing, for example to differentiate between species, subspecies or sexes, or to obtain a measure of body size or energy stores. However, the ecomorphological interpretation of standard[...]
Article
Kathrin Ganz, Auteur ; David Jenny, Auteur ; Thomas Kraemer, Auteur ; Lukas Jenni, Auteur ; Susanne Jenni-Eiermann, AuteurMethods to assess environmental pollution and stress responses in birds with scarcely invasive or non-invasive sampling are highly sought after in ecology and conservation. For several years now, feathers have been promoted as non-invasive tools[...]
Article
Pius Korner, Auteur ; Roman Graf, Auteur ; Lukas Jenni, AuteurLarge declines of farmland bird species have been observed in the lowlands of Western Europe, whereas important populations of some of these species have survived in parts of Eastern and Southern Europe and in small areas within Western Europe, [...]
Article
Roman Furrer, Auteur ; Michael Schaub, Auteur ; Andreas Bossert, Auteur ; Res Isler, Auteur ; Hannes Jenny, Auteur ; Tobias Jonas, Auteur ; Christian Marti, Auteur ; Lukas Jenni, AuteurAlpine species adapted to mountain climate are particularly vulnerable to environmental changes and have recently come under multiple environmental pressures, such as climate change associated with habitat loss (e.g. upward shift of the treeline[...]
Article
Claire Agnès Pernollet, Auteur ; Fränzi Korner-Nievergelt, Auteur ; Lukas Jenni, AuteurThe Alpine Rock Ptarmigan Lagopus muta helvetica is considered to be particularly vulnerable to climate change because it lives exclusively above the treeline in alpine habitats and is adapted to cold climates. Its Swiss population index has dec[...]
Article
Lukas Jenni, Auteur ; Milena M. Madry, Auteur ; Thomas Kraemer, Auteur ; Jacqueline Kupper, Auteur ; Hanspeter Naegeli, Auteur ; Hannes Jenny, Auteur ; David Jenny, AuteurSeveral cases of acute lead poisoning of golden eagles Aquilachrysaetos have been documented in the Alps. The question, however, remains how often golden eagles take up lead (once, chronically or episodically) and whether this uptake is in fatal[...]
Article
Linda Visinoni, Auteur ; Claire Agnès Pernollet, Auteur ; Jean-François Desmet, Auteur ; Fränzi Korner-Nievergelt, Auteur ; Lukas Jenni, AuteurThe Alpine Rock Ptarmigan (Lagopus muta helvetica)—which is adapted to arctic and alpine environments—is suspected to be vulnerable to climate warming, but direct evidence is limited. Microclimates within a landscape may allow species to exist i[...]
Article
Dominik Thiel, Auteur ; Susanne Jenni-Eiermann, Auteur ; Rupert Palme, Auteur ; Lukas Jenni, AuteurMontane and alpine habitats in Europe remained relatively undisturbed until the beginning of the last century. Today, outdoor recreation activities are a major economic factor in alpine regions. Many tourism areas coincide with winter habitats o[...]
Article
Fraenzi Korner-Nievergelt, Auteur ; Josef Hofer, Auteur ; Annette Sauter, Auteur ; Lukas Jenni, AuteurDans Wildfowl (2 2009)Within-winter movements of birds are of interest for the identification of sub-populations and for the assessment of the risk of bird-transmitted diseases. The probability of a Tufted Duck Aythya fuligula or a Common Pochard A. ferina wintering [...]
Article
Judith Fischer, Auteur ; Markus Jenny, Auteur ; Lukas Jenni, AuteurDans Bird Study (56 2009)Capsule Sky Larks make use of agri-environment measures in winter wheat for nesting and foraging during nestling provision. Aims To determine the suitability of in-field measures (patches and strips) for breeding Sky Larks in small-parcelled Swi[...]
Article
Steffen Hahn, Auteur ; Dimitar Dimitrov, Auteur ; Saskia Rehse, Auteur ; Elizabeth Yohannes, Auteur ; Lukas Jenni, AuteurDetailed knowledge about claw formation and growth rate is a prerequisite for the interpretation of avian claw stable isotopes, as is commonly done with feather stable isotopes to e.g. infer habitat use, dietary specialisations, and spatial occu[...]
Article
Susanna Komenda-Zehnder, Auteur ; Lukas Jenni, Auteur ; Felix Liechti, AuteurA limitation of standardized mist netting for monitoring migration is caused by the lack of knowledge about the relationship between trapped birds and birds flying aloft. Earlier studies related nocturnal radar counts with trapping data of the f[...]
Article
Lukas Jenni, Auteur ; Susanne Mueller, Auteur ; Fernando Spina, Auteur ; Anders Kvist, Auteur ; Ake Lindstroem, AuteurThe effects of an endurance flight on the haematocrit, the percentage of packed red blood cells per blood volume, were examined within the framework of six possible factors explaining possible changes in the haematocrit. Two approaches were adop[...]
Article
Mathis Mueller, Auteur ; Reto Spaar, Auteur ; Luc Schifferli, Auteur ; Lukas Jenni, AuteurThe increasing intensity of farming of meadows is supposed to be the major cause for strong declines of many meadow breeding birds. The whinchat, Saxicola rubetra, a Palaearctic migratory bird, is an indicator species of open grassland farmed at[...]
Article
Mathis Mueller, Auteur ; Reto Spaar, Auteur ; Luc Schifferli, Auteur ; Lukas Jenni, AuteurThe increasing intensity of farming of meadows is supposed to be the major cause for strong declines of many meadow breeding birds. The whinchat, Saxicola rubetra, a Palaearctic migratory bird, is an indicator species of open grassland farmed at[...]
Article
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.[...]
Article
Annette Sauter, Auteur ; Fraenzi Korner-Nievergelt, Auteur ; Lukas Jenni, AuteurOther than during periods of migration, animal movement tends to be poorly described, despite the potential importance of such movements, which may prove crucial for surviving periods of bad weather and low food availability. We analysed within-[...]
Article
Benjamin Homberger, Auteur ; Lukas Jenni, Auteur ; Jerome Duplain, Auteur ; Michael Lanz, Auteur ; Michael Schaub, AuteurReintroducing locally extinct species is an increasingly used conservation tool. However, many reintroductions fail to establish self-sustaining populations. The quality of the individuals released may crucially affect reintroduction success, bu[...]
Article
Nicolas Martinez, Auteur ; Lukas Jenni, Auteur ; Eric Wyss, Auteur ; Niklaus Zbinden, AuteurAs many other birds breeding in agricultural areas, the common redstart declined strongly in many Central European countries over the last 60 years. The destruction of traditionally managed orchards, an important breeding habitat in Central Euro[...]
Article
Gilberto Pasinelli, Auteur ; Michael Schaub, Auteur ; Guido Haefliger, Auteur ; Monika Frey, Auteur ; Hans Jakober, Auteur ; Mathis Mueller, Auteur ; Wolfgang Stauber, Auteur ; Piotr Tryjanowski, Auteur ; Jean-Luc Zollinger, Auteur ; Lukas Jenni, AuteurP>1. Populations of plants and animals typically fluctuate because of the combined effects of density-dependent and density-independent processes. The study of these processes is complicated by the fact that population sizes are typically not kn[...]
Article
Josef Hofer, Auteur ; Fränzi Korner-Nievergelt, Auteur ; Pius Korner-Nievergelt, Auteur ; Matthias Kestenholz, Auteur ; Lukas Jenni, AuteurMany waterbird species assemble in large aggregations during winter. In most species, these aggregations are generally thought to be composed of individuals not familiar to each other. In this study, we analysed mark-recapture data of Tufted Duc[...]
Article
Annette Sauter, Auteur ; Pius Korner, Auteur ; Wolfgang Fiedler, Auteur ; Lukas Jenni, AuteurCommon and widespread species often show a large variability in behaviour and habitat use. Such variability at the species level may result from individuals themselves being very variable or, alternatively, variability may arise from differences[...]
Article
Thomas S. Reichlin, Auteur ; Michael Schaub, Auteur ; Myles H. M. Menz, Auteur ; Murielle Mermod, Auteur ; Patricia Portner, Auteur ; Raphaël Arlettaz, Auteur ; Lukas Jenni, AuteurFor many bird species, recovery of ringed individuals remains the best source of information about their migrations. In this study, we analyzed the recoveries of ringed European Hoopoe (Upupa epops) and the Eurasian Wryneck (Jynx torquilla) from[...]
Article
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 [...]
Article
Fernando Spina, Auteur ; Lukas Jenni, Auteur ; Susi Jenni-Eiermann, Auteur
Article
Amélie N. Dreiss, Auteur ; Marco Calcagno, Auteur ; Valentijn Van Den Brink, Auteur ; Aurelie Laurent, Auteur ; Bettina Almasi, Auteur ; Lukas Jenni, Auteur ; Alexandre Roulin, AuteurThe conflict between siblings over how parental resources are divided has promoted the evolution of specific behaviour to outcompete each other. Young animals look out for parents' arrival in order to start begging as quickly as possible, since [...]
Article
Irene Keller, Auteur ; Fraenzi Korner-Nievergelt, Auteur ; Lukas Jenni, AuteurWaterbirds are often observed to move between different wintering sites within the same winter-for example, in response to food availability or weather conditions. Within-winter movements may contribute to the spreading of diseases, such as avia[...]
