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Documents disponibles écrits par cet auteur (6)
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Article
Nocturnal migrants do not incur higher collision risk at wind turbines than diurnally active species
Jorg Welcker, Auteur ; Monique Liesenjohann, Auteur ; Jan Blew, Auteur ; Georg Nehls, Auteur ; Thomas Grünkorn, AuteurNocturnally migrating birds, particularly passerines, are known to be vulnerable to collision with man-made structures such as buildings, towers or offshore platforms, yet information with respect to wind farms is ambiguous. We recorded bird fli[...]
Article
Divergent diving behavior during short and long trips of a bimodal forager, the little auk Alle alle
Zachary W. Brown, Auteur ; Jorg Welcker, Auteur ; Ann M. A. Harding, Auteur ; Wojciech Walkusz, Auteur ; Nina J. Karnovsky, AuteurThe purpose of this study was to characterize for the first time seabird diving behavior during bimodal foraging. Little auks Alle alle, small zooplanktivorous Alcids of the High Arctic, have recently been shown to make foraging trips of short a[...]
Article
Jorg Welcker, Auteur ; Ann M. A. Harding, Auteur ; Nina J. Karnovsky, Auteur ; Harald Steen, Auteur ; Hallvard Strom, Auteur ; Geir W. Gabrielsen, AuteurA bimodal foraging strategy has previously been described for procellariiform seabird species and is thought to have evolved in response to local resource availability being too low for adult birds to meet chick requirements and simultaneously m[...]
Article
Hans-Ulrich Peter, Auteur ; Christina Buesser, Auteur ; Igor Chupin, Auteur ; Tim Janicke, Auteur ; Anja Kahles, Auteur ; Simone Pfeiffer, Auteur ; Markus Ritz, Auteur ; Zipan Wang, Auteur ; Jorg Welcker, Auteur
Article
Juli Broggi, Auteur ; Magdalene Langset, Auteur ; Bernt Ronning, Auteur ; Jorg Welcker, Auteur ; Claus Bech, AuteurThe maintenance of an effective immune system may entail physiological costs only affordable by individuals in good condition. Some species, like Black-legged Kittiwakes (Rissa tridactyla) in the high arctic, experience important physiological c[...]
Article
Jorg Welcker, Auteur ; Harald Steen, Auteur ; Ann M. A. Harding, Auteur ; Geir W. Gabrielsen, AuteurSexual differences in foraging and provisioning behaviour have been observed in several size-dimorphic seabird species. These differences are usually thought to be driven by size-related mechanisms such as the ability to compete for food or defe[...]
