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Documents disponibles écrits par cet auteur (24)
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Article
Sissel Sjoberg, Auteur ; Gintaras Malmiga, Auteur ; Andreas Nord, Auteur ; Arne Andersson, Auteur ; Johan Bäckman, Auteur ; Maja Tarka, Auteur ; Mikkel Willemoes, Auteur ; Kasper Thorup, Auteur ; Bengt Hansson, Auteur ; Thomas Alerstam, Auteur ; Dennis Hasselquist, AuteurMigrating from hemisphere to hemisphere is a global strategy for many bird species. Despite allowing birds to track productivity, these long-distance movements bring them in contact with inhospitable regions such as deserts and oceans. Sjöberg e[...]
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Åke Lindström, Auteur ; Thomas Alerstam, AuteurWaders normally fly with their legs stretched out under the tail, with their feet pointing backwards. Whereas there are a few published records of waders flying with their legs folded forward (like a passerine), with legs and feet tucked in unde[...]
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Thomas Alerstam, Auteur ; Johan Bäckman, Auteur ; Tom J. Evans, AuteurMany flying animals, like birds feeding their young, make commuting flights between a central place and foraging areas in the surroundings. Such central place foraging (CPF) represents a special case of foraging theory. We use simple geometry an[...]
Article
Sissel Sjoberg, Auteur ; Lykke Pedersen, Auteur ; Gintaras Malmiga, Auteur ; Thomas Alerstam, Auteur ; Bengt Hansson, Auteur ; Dennis Hasselquist, Auteur ; Kasper Thorup, Auteur ; Anders P. Tøttrup, Auteur ; Arne Andersson, Auteur ; Johan Bäckman, AuteurRecent advances in tracking technology are based on the use of miniature sensors for recording new aspects of individual migratory behaviour. In this study, we have used activity data loggers with barometric and temperature sensors to record the[...]
Article
Anders P. Tøttrup, Auteur ; Raymond H. G. Klaassen, Auteur ; Roine Strandberg, Auteur ; Kasper Thorup, Auteur ; Mikkel Willemoes Kristensen, Auteur ; Peter Søgaard Jørgensen, Auteur ; James Fox, Auteur ; Vsevolod Afanasyev, Auteur ; Carsten Rahbek, Auteur ; Thomas Alerstam, AuteurThe small size of the billions of migrating songbirds commuting between temperate breeding sites and the tropics has long prevented the study of the largest part of their annual cycle outside the breeding grounds. Using light-level loggers (geol[...]
Article
Thomas Alerstam, Auteur ; Jason W. Chapman, Auteur ; Johan Bäckman, Auteur ; Alan D. Smith, Auteur ; Håkan Karlsson, Auteur ; Cecilia Nilsson, Auteur ; Don R. Reynolds, Auteur ; Raymond H. G. Klaassen, Auteur ; Jane K. Hill, AuteurVast numbers of insects and passerines achieve long-distance migrations between summer and winter locations by undertaking high-altitude nocturnal flights. Insects such as noctuid moths fly relatively slowly in relation to the surrounding air, w[...]
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Sara S. Henningsson, Auteur ; Thomas Alerstam, AuteurWe analysed migratory connectivity between different winter quarters and breeding sectors in the circumpolar tundra region for arctic shorebirds, in relation to migratory distances and ecological barriers. Total distances and barriers were calcu[...]
Article
Johan Bäckman, Auteur ; Arne Andersson, Auteur ; Thomas Alerstam, Auteur ; Lykke Pedersen, Auteur ; Sissel Sjoberg, Auteur ; Kasper Thorup, Auteur ; Anders P. Tottrup, AuteurWe describe a method and device (
Article
Roine Strandberg, Auteur ; Raymond H. G. Klaassen, Auteur ; Mikael Hake, Auteur ; Patrik Olofsson, Auteur ; Kasper Thorup, Auteur ; Thomas Alerstam, AuteurWe tracked three juvenile and 14 adult Marsh Harriers Circus aeruginosus from southern Sweden via satellite to investigate migration strategies. Four individuals were tracked for at least two years. All three juveniles and four of the adults mad[...]
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Roine Strandberg, Auteur ; Raymond H. G. Klaassen, Auteur ; Patrik Olofsson, Auteur ; Thomas Alerstam, AuteurWe analysed satellite tracking data to reveal the daily travel schedules of Hobbies Falco subbuteo migrating between northern Europe and southern Africa. By comparing movements during short-time intervals of 1-8 h at different times of the day b[...]
Article
Anna L. K. Nilsson, Auteur ; Thomas Alerstam, Auteur ; Jan-Ake Nilsson, AuteurThe knowledge of migration systems in long-distance regular migrants is in many cases extensive. Our understanding of the migratory characteristics of partial migrants, on the other hand, is far more rudimentary. We investigated migratory charac[...]
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Johan Nilsson, Auteur ; Thomas Alerstam, Auteur ; Jan-Ake Nilsson, Auteur
Article
Johanna Groenroos, Auteur ; Martin Green, Auteur ; Thomas Alerstam, AuteurFlight directions and routes of migrating birds are determined by the birds' compass orientation, but also by effects of wind, social influence, responses to topography and landmarks, and to navigation cues. We investigated the orientation and r[...]
Article
Kasper Thorup, Auteur ; Thomas Alerstam, Auteur ; Mark Fuller, Auteur ; Mikael Hake, Auteur ; Nils Kjellen, Auteur
Article
Sara S. Henningsson, Auteur ; Thomas Alerstam, AuteurDans Ardea (94(3) 2006)The longitudinal spread zone was investigated for 30 arctic shorebird populations from 10 different wintering communities in widely different regions of both the Northern and Southern Hemispheres. Information about total breeding and wintering r[...]
Article
Raymond H. G. Klaassen, Auteur ; Roine Strandberg, Auteur ; Mikael Hake, Auteur ; Patrik Olofsson, Auteur ; Anders P. Tottrup, Auteur ; Thomas Alerstam, AuteurLoop migration among birds is characterized by the spring route lying consistently west or east of the autumn route. The existence of loops has been explained by general wind conditions or seasonal differences in habitat distribution. Loop migra[...]
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Åke Lindström, Auteur ; Thomas Alerstam, Auteur ; Peter Bahlenberg, Auteur ; Robert Ekblom, Auteur ; James W. Fox, Auteur ; Johan Raghall, Auteur ; Raymond H. G. Klaassen, AuteurThe migration of the great snipe Gallinago media was previously poorly known. Three tracks in 2010 suggested a remarkable migratory behaviour including long and fast overland non-stop flights. Here we present the migration pattern of Swedish mal[...]
Article
Roine Strandberg, Auteur ; Mikael Hake, Auteur ; Raymond H. G. Klaassen, Auteur ; Thomas Alerstam, AuteurStrandberg R., Hake M., Klaassen R.H.G. & Alerstam T. 2012. Movements of immature European Honey Buzzards Pernis apivorus in tropical Africa. Ardea 100: 157-162. Immature European Honey Buzzards Pernis apivorus are believed to remain in tropical[...]
Article
Håkan Karlsson, Auteur ; Cecilia Nilsson, Auteur ; Johan Bäckman, Auteur ; Thomas Alerstam, AuteurNocturnal passerine migrants could substantially reduce the amount of energy spent per distance covered if they fly with tailwind assistance and thus achieve ground speeds that exceed their airspeeds (the birds' speed in relation to the surround[...]
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Thomas Alerstam, AuteurUsing optimality perspectives is now regarded as an essential way of analysing and understanding adaptations and behavioural strategies in bird migration. Optimization analyses in bird migration research have diversified greatly during the two r[...]
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Johanna Gronroos, Auteur ; Martin Green, Auteur ; Thomas Alerstam, AuteurMigratory movements in air or water are strongly affected by wind and ocean currents and an animal which does not compensate for lateral flow will be drifted from its intended direction of movement. We investigated whether arctic shorebirds duri[...]
Article
Roine Strandberg, Auteur ; Thomas Alerstam, Auteur ; Mikael Hake, Auteur ; Nils Kjellen, Auteur
Article
Thomas Alerstam, AuteurDans Ardea (94(3) 2006)In time-selected migration birds adapt their fuel deposition and flight behaviour to maximise sustained migration speed. What are the expectations for the final part of spring migration when the transition to breeding takes place and the criteri[...]
Article
Kasper Thorup, Auteur ; Yannis Vardanis, Auteur ; Anders P. Tottrup, Auteur ; Mikkel Willemoes Kristensen, Auteur ; Thomas Alerstam, AuteurThe timing of migration is generally considered of utmost importance for reproduction and survival, and timing is furthermore considered to be under strong genetic control. The individual timing of migration is presumably a result of a combinati[...]
