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Documents disponibles écrits par cet auteur (6)
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Article
Rune Sørås, Auteur ; Oda A. Gundersen, Auteur ; Ronny Steen, Auteur ; Geir A. Sonerud, AuteurBirds providing prey with a clumped distribution often return to the previous capture site after having delivered a prey item at the nest. However, details of this foraging tactic are still poorly known, in particular for birds of prey, which of[...]
Article
Ronny Steen, AuteurCapsule: Automated monitoring of daily activity in birds can be facilitated by the use of a smartphone with video analysis software.Aims: To test the application of an iPhone 5 smartphone with video motion detection for monitoring birds remotely[...]
Article
Hilde Marie Johansen, Auteur ; Vidar Selås, Auteur ; Kristine Fagerland, Auteur ; Jon Trygve Johnsen, Auteur ; Bjorn-Arild Sveen, Auteur ; Luis Tapia, Auteur ; Ronny Steen, AuteurDuring the past decades, goshawk (Accipiter gentilis) populations have declined in torest-dominated landscapes in Norway. To reveal the importance of different prey species in forest versus farmland landscapes, we video recorded 146 prey deliver[...]
Article
Ronny Steen, Auteur ; Vidar Selås, Auteur ; Ingvar Stenberg, AuteurWeather may play an important role in population dynamics by effects on breeding success and survival. To establish the impact of weather on populations of Lesser Spotted Woodpecker Dendrocopos minor we compared numbers in two regions in Nor-way[...]
Article
Ronny Steen, Auteur ; Geir A. Sonerud, Auteur ; Tore Slagsvold, AuteurIn altricial birds, parents are assumed to optimize the total food delivery to the brood given the time constraints set by self-feeding and food collecting. Older nestlings may require more food than younger ones, and nestlings may need more ene[...]
Article
Prey delivery rates as estimates of prey consumption by Eurasian Kestrel Falco tinnunculus nestlings
Ronny Steen, Auteur ; Line M. Low, Auteur ; Geir A. Sonerud, Auteur ; Vidar Selås, Auteur ; Tore Slagsvold, AuteurIn altricial birds the type of prey selected by parents for their nestlings may affect the allocation of time and energy spent on hunting, preparing prey and feeding the nestlings, which in turn may affect the rate of provisioning. Raptors take [...]
