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Article
Cecilia Nilsson, Auteur ; Johan Bäckman, Auteur ; Adriaan M. Dokter, AuteurAmong the many unique flight behaviours of Common Swifts Apus apus, the most puzzling may be their ascents to high altitudes during both dusk and dawn. Twilight ascents have been hypothesized to be functionally related to information acquisition[...]
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[...]
Article
Cecilia Nilsson, Auteur ; Sissel Sjoberg, AuteurThat birds migrate in the reverse direction of the expected is a phenomenon of regular occurrence which has been observed at many sites. Here we use three different methods; tracking radar, radiotelemetry and ringing, to characterize the flights[...]
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[...]
