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Article
Article
Compass orientation in reference to the magnetic field is a well established behaviour in birds and other animals. On the other hand, the presence and significance of magnetic gradient navigation is more controversial though the time-trend is to[...]
Article
Compass calibrations around sunrise and sunset are generally supposed to be important and necessary for the process and progress of bird migration. However, the question remains whether this is an established fact or just conventional wisdom. Mi[...]
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Kasper Thorup, Auteur ; Jorgen Rabol, Auteur ; Birgit Erni, AuteurAmong-individual variation in mean migration directions is the basis of evolution of new migration routes and has important consequences for our understanding of the migratory orientation system. This variation in migration directions is also of[...]
Article
Three samples of long-distance passerine juvenile night-migrants were trapped as passage migrants on Christianso in the Baltic Sea in autumn and transported about 300 km W to Endelave, where funnel-experiments under a starry sky were carried out[...]
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Kasper Thorup, Auteur ; Troels Eske Ortvad, Auteur ; Richard A. Holland, Auteur ; Jorgen Rabol, Auteur ; Mikkel Willemoes Kristensen, Auteur ; Martin Wikelski, AuteurMigratory birds are frequently found far outside their normal range but the phenomenon is poorly understood. We used radio telemetry to track individual migratory flights of several species of songbirds on the Faroe Islands, far west of their no[...]
Article
Jorgen Rabol, Auteur ; Carsten Rahbek, AuteurLarge numbers of migrant passerines were ringed during spring and autumn on the small Danish island of Christianso in the Baltic Sea. For the period 1976-1996 we investigated the population trends using catches (corrected for trapping effort) of[...]
