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Documents disponibles écrits par cet auteur (13)
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Article
F. Liechti ; A. Hedenstrom ; T. Alerstam 1994J Theor Biol 170 p219-225
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B. Bruderer ; F. Liechti 1994Bird Strike Committee Europe BSCE22/WP33 p243-254
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B. Bruderer ; F. Liechti ; D. Erich 1989Vogel Luftverkher 9(2) p174-194
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F. Liechti, AuteurMigration is a task that implies a route, a goal and a period of time. To achieve this task, it requires orientation abilities to find the goal and energy to cover the distance. Completing such a journey by flying through a moving airspace makes[...]
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B. Bruderer, Auteur ; F. Liechti, AuteurNumerous reports on homogeneous streams of nocturnal migrants over land and water, crossing coastlines without taking any notice of the habitat change underneath, seem to contradict recent infrared observations along the French and Spanish Medit[...]
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F. Nievergelt, Auteur ; F. Liechti, AuteurA widely applied method of experimentally determining migratory activities and directions is the so called Emlen-funnel cage, using typewriter correcting paper (Tipp-Ex(C)) for the registration. We investigated methodical biases, with respect to[...]
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F. Nievergelt, Auteur ; F. Liechti, Auteur
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S. Zehnder, Auteur ; S. Akesson, Auteur ; F. Liechti, Auteur ; B. Bruderer, AuteurWe investigated the patterns of nocturnal bird migration in autumn 1998 at a coastal site on the Falsterbo peninsula in south-western Sweden, by means of a passive infrared device. In total 17411 flight paths, including track direction and altit[...]
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F. Liechti, Auteur ; D. Peter, Auteur ; S. Komenda-Zehnder, AuteurNocturnal autumn bird migration was studied for the first time along the southern edge of the western Sahara. A passive infrared device provided data on the intensity and direction of nocturnal passage at 9 different sites for 20 nights from daw[...]
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F. Liechti, Auteur ; B. Bruderer, AuteurTracking radar measurements of winds at the Eight levels of bird migration during several migratory seasons in central Europe, southern Israel and the western Mediterranean are analysed with regard to optimal migratory behaviour in relation to w[...]
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S. Komenda-Zehnder, Auteur ; F. Liechti, Auteur ; B. Bruderer, AuteurAbout 23 000 tracks of individual nocturnal migrants and density measurements in 131 nights were recorded by tracking radar at two sites in Israel during autumn 1991 and spring 1992. We used this data to analyse the occurrence of reverse migrati[...]
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H. Schmaljohann, Auteur ; F. Liechti, Auteur ; B. Bruderer, Auteur
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B. Erni, Auteur ; F. Liechti, Auteur ; L. G. Underhill, Auteur ; B. Bruderer, AuteurFor the first time an almost complete sample of the seasonal course of nocturnal autumn migration was recorded by a conically scanning pencil-beam radar and was analysed with respect to weather, using a log-linear regression model. A variable ai[...]
