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Article
Robert L. Jefferies, Auteur ; Rudolf H. Drent, AuteurDans Ardea (94(3) 2006)The current favourable numerical status of most arctic-breeding goose populations conceals an increasing dependence on man-modified habitats for much of the year. Almost all populations are now heavily dependent on agricultural crops when the bi[...]
Article
Gotz Eichhorn, Auteur ; Vsevolod Afanasyev, Auteur ; Rudolf H. Drent, Auteur ; Henk P. van der Jeugd, AuteurDans Ardea (94(3) 2006)tBy attaching 9-g loggers (recording dusk and dawn times to a memory chip) to the coded leg rings of Barnacle Geese Branta leucopsis caught in a breeding colony at Tobseda (68 degrees 35'N, 52 degrees 20'E) on the arctic coast of the Russian Fed[...]
Article
Sandra van der Graaf, Auteur ; Julia Stahl, Auteur ; Agata Klimkowska, Auteur ; Jan P. Bakker, Auteur ; Rudolf H. Drent, AuteurDans Ardea (94(3) 2006)The nutritional quality of forage plants varies in space and time. This variation is presumed to drive the annual migration of herbivore species which follow peaks in the availability of high quality forage between sites. The green-wave hypothes[...]
Article
Rudolf H. Drent, AuteurDans Ardea (94(3) 2006)Perrins (1970) galvanized thinking on the timing of birds' breeding seasons by pointing out that most individuals laid too late for the offspring to profit fully from the seasonal peak of food abundance, and suggested that the proximate cause wa[...]
