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Article
Vidar Selås, Auteur ; Oddmund Kleven, Auteur ; Odd Frydenlund Steen, AuteurThe turnover rate of breeding Northern Goshawk Accipiter gentilis females in two study areas in southern Norway, which are assumed to experience different levels of illegal human persecution, was estimated using DNA extracted from moulted feathe[...]
Article
Vidar Selås, AuteurIn Scandinavia, the Eurasian Jay (Garrulus glandarius) is a resident forest-dwelling species, which in some years show eruptive movements in the autumn. Such irruptions seem to be related to the variation in seed crops of oaks (Quercus spp.). Wh[...]
Article
Vidar Selås, Auteur ; Reidar Tveiten, Auteur ; Ole Martin Aanonsen, AuteurWe examined the diet of six breeding Common Buzzard (Buteo buteo) pairs in southern Norway, by analysing pellets and prey remains collected around and in nests, and by video recording prey delivery at the nests. Mammals, birds and reptiles were [...]
Article
Olav Hogstad, Auteur ; Vidar Selås, Auteur ; Sverre Kobro, AuteurIn a subalpine birch forest in Central Norway, the breeding population of fieldfare Turdus pilaris varied from 3 to 63 pairs per km2 during 1966-2000. For the period 1971-1995, the breeding density was negatively related to the number of days wi[...]
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
Jostein Gohli, Auteur ; Jan Erik Roer, Auteur ; Vidar Selås, Auteur ; Ingvar Stenberg, Auteur ; Terje Lislevand, AuteurThe Lesser Spotted Woodpecker (Dendrocopos minor) is a partial migrant in Fennoscandia, where migratory autumn irruptions outside the regular breeding areas occur in some years. Little is known about the migration of this species along the coast[...]
Article
Vidar Selås, AuteurAccording to the alternative prey hypothesis, autumn populations of ground-nesting game birds fluctuate in synchrony with vole numbers because generalist predators that mainly eat voles switch to alternative prey, such as eggs and chicks, when v[...]
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 [...]
