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Documents disponibles écrits par cet auteur (7)
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Ouvrage
Franz Bairlein, Auteur ; J. Dierschke ; V. Dierschke, Auteur ; V. Salewski, Auteur ; O. Geiter, Auteur ; K. Hüppop, Auteur ; U. Köppen, Auteur ; W. Fiedler, Auteur | Wiebelsheim : Aula-Verlag | 2014Utilising 1.5 million recoveries, of almost 975,000 individual birds, the Atlas des Volgelzugs details the movements and fates of 298 species which breed, overwinter or migrate through Germany. For each species, where the data permit, separate [...]
Article
I. Ottich, Auteur ; V. Dierschke, AuteurThe seasonal variation in the supply of ripe Elderberries (Sambucus nigra ) on the offshore island of Helgoland (North Sea) was examined from the point of view of the effect of food supply and exploitation on the stopover behaviour of migrating [...]
Article
V. Dierschke, AuteurDans Ardea (86(1) 1998)During autumn migration, up to 1100 juvenile Dunlins Calidris alpina per day forage on the island of Helgoland (SE North Sea). Beds of washed up wracks and kelp sire used as a feeding habitat where they take kelp fly larvae (Coelopidae) at a hig[...]
Article
H. Schmaljohann, Auteur ; V. Dierschke, Auteur1. Experiments testing predictions of optimal migration theory so far have concentrated on time and energy as the expenses that birds strive to minimize during migration. Taking advantage of the high variation in numbers of migrating raptors ove[...]
Article
V. Dierschke, AuteurOn the offshore island Helgoland, passerine birds killed by predators (feral cats Felis catus and raptors, mainly sparrowhawks Accipiter nisus) during Stopover were measured and weighed when found freshly killed and still intact. Supplemented by[...]
Article
A. Zinke, Auteur ; B. Schnebel, Auteur ; V. Dierschke, Auteur ; M. Ryll, AuteurPrevalence and intensity of excretion of coccidial oocysts in actively migrating passerines (Turdus philomelos, Fringilla coelebs, Sylvia borin, Phoenicurus phoenicurus) were assessed in spring and autumn 2001 during stopovers on Helgoland. All [...]
Article
V. Dierschke, Auteur ; J. Delingat, Auteur ; H. Schmaljohann, AuteurAccording to full-day observations (scan sampling), Northern Wheatears (Oenanthe -oenanthe ) stopping over on the island of Helgoland (SE North Sea) during spring and autumn migration spent 51 - 67 % of the daylight period foraging. Large parts [...]
