15 Works

Data from: Climate change and functional traits affect population dynamics of a long-lived seabird

Stephanie Jenouvrier, Marine Desprez, Rémi Fay, Christophe Barbraud, Henri Weimerskirch, Karine Delord & Hal Caswell
1. Recent studies unravelled the effect of climate changes on populations through their impact on functional traits and demographic rates in terrestrial and freshwater ecosystems, but such understanding in marine ecosystems remains incomplete. 2. Here, we evaluate the impact of the combined effects of climate and functional traits on population dynamics of a long-lived migratory seabird breeding in the southern ocean: the black-browed albatross (Thalassarche melanophris, BBA). We address the following prospective question: ''Of all...

Data from: The importance of size, location and vegetation composition of perennial fallows for farmland birds

Kim S. Meichtry-Stier, Jérôme Duplain, Michael Lanz, Bernard Lugrin & Simon Birrer
Across Europe, patches of un-cropped land (field margins, fallows etc.) have been established and managed as part of agri-environment schemes (AES) to counteract the decrease of farmland biodiversity. Various studies demonstrate a positive impact of such un-cropped land on different taxa. However, there is potential to further improve the efficiency of fallow options for farmland birds. In a long-term monitoring, 12 breeding farmland bird species and sizes of perennial fallows were recorded from 1992 to...

Data from: Low intensity blood parasite infections do not reduce the aerobic performance of migratory birds

Steffen Hahn, Silke Bauer, Dimitar Dimitrov, Tamara Emmenegger, Karina Ivanova, Pavel Zehtindjiev & William A. Buttemer
Blood parasites (Haemosporidia) are thought to impair the flight performance of infected animals, and therefore, infected birds are expected to differ from their non-infected counterparts in migratory capacity. Since haemosporidians invade host erythrocytes, it is commonly assumed that infected individuals will have compromised aerobic capacity, but this has not been examined in free-living birds. We tested if haemosporidian infections affect aerobic performance by examining metabolic rates and exercise endurance in migratory great reed warblers (Acrocephalus...

Data from: Field validation of radar systems for monitoring bird migration

Cecilia Nilsson, Adriaan M. Dokter, Baptiste Schmid, Martina Scacco, Liesbeth Verlinden, Johan Bäckman, Günther Haase, Giacomo Dell'Omo, Jason W. Chapman, Hidde Leijnse & Felix Liechti
1. Advances in information technology are increasing the use of radar as a tool to investigate and monitor bird migration movements. We set up a field campaign to compare and validate outputs from different radar systems. 2. Here we compare the pattern of nocturnal bird migration movements recorded by four different radar systems at a site in southern Sweden. Within the range of the weather radar (WR) Ängelholm, we operated a “BirdScan” (BS) dedicated bird...

Data from: Highly mobile insectivorous swifts perform multiple intra-tropical migrations to exploit an asynchronous African phenology

Gabriel Norevik, Giovanni Boano, Anders Hedenström, Roberto Lardelli, Felix Liechti & Susanne Åkesson
With timely allocated movement phases, mobile organisms can match their space-use with the seasonality of the environment and thereby optimise their resource utilisation over time. Long-distance avian migrants are known to move with the seasonal dynamics on an annual basis, but how individuals respond to seasonality within their tropical non-breeding range has been less studied. Here we analyse the movement pattern of a highly mobile aerial insectivorous bird, the pallid swift Apus pallidus, and its...

Data from: Relationships between vital rates and ecological traits in an avian community

Edwige Bellier, Marc Kéry & Michael Schaub
1. Comparative studies about the relationships between vital rates and ecological traits at the community level are conspicuously lacking for most taxa because estimating vital rates requires detailed demographic data. Identifying relationships between vital rates and ecological traits could help to better understand ecological and evolutionary demographic mechanisms that lead to interspecific differences in vital rates. 2. We use novel dynamic N-mixture models for counts to achieve this for a whole avian community comprising 53...

Data from: Where do wintering cormorants come from? Long-term changes in the geographical origin of a migratory bird on a continental scale

Morten Frederiksen, Fränzi Korner-Nievergelt, Loïc Marion & Thomas Bregnballe
1. Populations of migratory birds often mix to a considerable extent in their wintering areas. Knowledge about the composition of wintering populations is highly relevant in relation to management, not least for species, such as the great cormorant Phalacrocorax carbo sinensis, prone to conflicts with human interests. However, few studies have been able to estimate long-term changes in winter population composition. 2. We use 30 years of ringing and recovery data (1983-2013) from all major...

Data from: Eye region surface temperature reflects both energy reserves and circulating glucocorticoids in a wild bird

Paul Jerem, Susanne Jenni-Eiermann, Katherine Herborn, Dorothy McKeegan, Dominic J. McCafferty & Ruedi G. Nager
Body temperature of endotherms shows substantial within- and between-individual variation, but the sources of this variation are not fully understood in wild animals. Variation in body temperature can indicate how individuals cope with their environment via metabolic or stress-induced effects, both of which may relate to depletion of energy reserves. Body condition can reflect heat production through changes to metabolic rate made to protect energy reserves. Additionally, changes in metabolic processes may be mediated by...

Data from: Numerical response of mammalian carnivores to rodents affects bird reproduction in temperate forests: a case of apparent competition?

Alexander Grendelmeier, Raphaël Arlettaz, Gilberto Pasinelli & Alex Grendelmeier
Resource pulses such as mast seeding in temperate forests may affect interspecific interactions over multiple trophic levels and link different seed and non-seed consumers directly via predation or indirectly via shared predators. However, the nature and strength of interactions among species remain unknown for most resource pulse driven ecosystems. We considered five hypotheses concerning the influence of resource pulses on the interactions between rodents, predators and bird reproduction with data from northern Switzerland collected between...

Data from: Use of classical bird census transects as spatial replicates for hierarchical modeling of an avian community

María V. Jiménez-Franco, Marc Kéry, Mario León-Ortega, Francisco Robledano, Miguel A. Esteve & José F. Calvo
New monitoring programs are often designed with some form of temporal replication to deal with imperfect detection by means of occupancy models. However, classical bird census data from earlier times often lack temporal replication, precluding detection-corrected inferences about occupancy. Historical data have a key role in many ecological studies intended to document range shifts, and so need to be made comparable with present‐day data by accounting for detection probability. We analyze a classical bird census...

Data from: Seasonal differences in baseline innate immune function are better explained by environment than annual cycle stage in a year-round breeding tropical songbird

Chima J. Nwaogu, Will Cresswell, Maaike A. Versteegh & B. Irene Tieleman
1. Seasonal variation in innate immunity is often attributed to either temporal environmental variation or to life history trade-offs that arise from specific annual cycle stages but decoupling them is difficult in natural populations. 2. Here, we effectively decouple seasonal environmental variation from annual cycle stage effects by exploiting cross-seasonal breeding and moult in the tropical Common Bulbul Pycnonotus barbatus. We test how annual cycle stage interacts with a key seasonal environmental variable, rainfall, to...

Data from: Matching geographical assignment by stable isotopes with African non-breeding sites of Barn swallows Hirundo rustica tracked by geolocation

Nina Seifert, Roberto Ambrosini, Luana Bontempo, Frederica Camin, Felix Liechti, Diego Rubolini, Chiara Scandolara, Nicola Saino, Steffen Hahn & Federica Camin
Knowledge on whereabouts within the annual cycle of migratory species is prerequisite for many aspects in ecology and biological conservation. Spatial assignments of stable isotopes archived in tissues allows for later inference on sites where the specific tissue had been grown.. It has been rarely tested whether spatial assignments match directly tracked non-breeding residences, especially for migratory songbirds. We here compare assignments of stable isotopes from feathers of Palaearctic Barn swallows Hirundo rustica with their...

Data from: Female-biased dispersal and non-random gene flow of MC1R variants do not result in a migration load in barn owls

Valérie Ducret, Michael Schaub, Jérôme Goudet & Alexandre Roulin
Non-random gene flow is a widely neglected force in evolution and ecology. This genotype-dependent dispersal is difficult to assess, yet can impact the genetic variation of natural populations and their fitness. In this work, we demonstrate a high immigration rate of barn owls (Tyto alba) inside a Swiss population surveyed during 15 years. Using 10 microsatellite loci as an indirect method to characterize dispersal, two third of the genetic tests failed to detect a female-biased...

Data from: Finish with a sprint: evidence for time‐selected last leg of migration in a long‐distance migratory songbird

Martins Briedis, Steffen Hahn, Miloš Krist & Peter Adamík
Under time‐selected migration, birds should choose a strategy for outcompeting rivals over securing access to prime resources at the final destination. Thus, migration can be viewed as a race among individuals where winners are arriving first when conditions are suitable. The sprint migration hypothesis predicts that individuals shift from maximum sustained speed to a final burst of sprint to shorten the transition from migration to breeding (Alerstam, 2006). In this study, we test the hypothesis...

Data from: Across a migratory divide: divergent migration directions and non-breeding grounds of Eurasian reed warblers revealed by geolocators and stable isotopes

Petr Procházka, Vojtěch Brlík, Elizabeth Yohannes, Bert Meister, Jürgen Auerswald, Mihaela Ilieva & Steffen Hahn
Migratory divides represent narrow zones of overlap between parapatric populations with distinct migration directions and, consequently, expected divergent non-breeding distributions. The composition of the mixed population at a migratory divide and the corresponding non-breeding ranges remain, however, unknown for many Palaearctic-African migrants. Here, we used light-level geolocation to track migration direction and non-breeding grounds of Eurasian reed warblers (Acrocephalus scirpaceus) from three breeding populations across the species’ migratory divide. Moreover, by using feathers grown at...

Registration Year

  • 2018

Resource Types

  • Dataset


  • Swiss Ornithological Institute
  • Lund University
  • Institute of Biodiversity and Ecosystem Research
  • University of Amsterdam
  • Max Planck Institute for Ornithology
  • Swedish Meteorological and Hydrological Institute
  • University of Wollongong
  • University of Glasgow
  • The Arctic University of Norway
  • University of Milan