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Article
F. Liechti ; A. Hedenstrom ; T. Alerstam 1994J Theor Biol 170 p219-225
Ouvrage
Cambridge University Press Cambridge (USA) 420p 137fig
Article
T. Alerstam, Auteur ; A. Hedenstrom, AuteurThe full magnitude and complexity of bird migration have not been possible to grasp until after the revolutionary discoveries made with the aid of, e.g., ringing, systematic field observations and radar. These have opened up opportunities for a [...]
Article
M. Green, Auteur ; T. Alerstam, Auteur ; G. A. Gudmundsson, Auteur ; A. Hedenstrom, Auteur ; T. Piersma, AuteurWe analysed five data sets of night directions of migrating arctic waders ill relation to,winds, recorded by tracking radar and optical range finder, in order to find out if these birds compensate for wind drift, or allow themselves to be drifte[...]
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M. Green, Auteur ; T. Alerstam, AuteurAerodynamic theories of bird flight predict that horizontal flight speed will increase with increasing load whereas vertical Eight speed will decrease. Horizontal flight speed for birds minimizing overall time on migration is predicted to be hig[...]
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A. Hedenstrom, Auteur ; T. Alerstam, AuteurBird migration is typically characterized by periods of flight, when fuel is consumed, and intervening stopover periods when fuel is deposited. The resulting overall migration speed can be calculated on the basis of flight speed, rate of Furl de[...]
Article
S. Akesson, Auteur ; T. Alerstam, AuteurThe possibility that albatrosses use a geomagnetic bi-coordinate map for long-distance navigation at sea was investigated by evaluating how five different geomagnetic parameters (i.e. total field intensity, horizontal and vertical field intensit[...]
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G. A. Gudmundsson, Auteur ; T. Alerstam, AuteurLittle attention has been given to the types of maps used in migration studies. However, we think that analyses of migration in two dimensions by applying different map projection rules may give valuable insights about biological control program[...]
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T. Alerstam, Auteur ; A. Hedenstrom, Auteur
Article
M. Hake, Auteur ; N. Kjellen, Auteur ; T. Alerstam, AuteurAutumn migration routes and orientation of Swedish Ospreys Pandion haliaetus were studied by satellite tracking of 18 birds. Of these. 13 could be followed during the entire migration (6 females, 5 males and 2 juveniles). Most birds migrated acr[...]
Article
T. P. Weber, Auteur ; T. Alerstam, Auteur ; A. Hedenstrom, AuteurDespite evidence that wind conditions are ail important factor in determining stopover decisions, models of time-minimizing bird migration have up to now emphasized the optimal response of the migrants to variations in fuel acquisition rates. We[...]
Article
N. Kjellen, Auteur ; M. Hake, Auteur ; T. Alerstam, Auteur
Article
N. Kjellen, Auteur ; M. Hake, Auteur ; T. Alerstam, AuteurBreeding Ospreys were studied in southern Sweden and 13 birds were tracked by satellite telemetry on autumn migration to the African wintering grounds. This was supplemented with studies of migrating birds at Falsterbo and radar trackings From s[...]
Article
G. A. Gudmundsson, Auteur ; T. Alerstam, AuteurTracking radar studies mere carried out during the summer 1996 in the central polar basin (85-90 degrees N) to investigate if birds accomplish transpolar migration. We here report the absence of bird migration from this region, in glaring contra[...]
