Browsing AURA by Author "Solheim, Roar"
Now showing items 1-20 of 23
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Age and sex of Snowy Owls (Bubo scandiacus) during summer irruption on Beliy Island, Yamal in 2015.
Solheim, Roar; Sokolov, Aleksandr (Peer reviewed; Journal article, 2021)In early summer 2015 a super peak of lemmings (Lemmus sibiricus) appeared on Beliy Island north of Yamal peninsula, Russia (73o19’N, 70o15’E). Considerable numbers of Snowy Owls (Bubo scandiacus) were present, possibly as ... -
Age of Great Grey Owls Strix nebulosa observed in Scandinavia in 2012 as revealed by digital photos in the national species report archives.
Solheim, Roar (Journal article; Peer reviewed, 2014)Record breaking numbers of breeding Great Grey Owls Strix nebulosa were reported in Sweden and Norway in 2010 and 2011, followed by 4105 observations in 2012 as revealed by the national Species archives. Based on locality ... -
Age structure in a newly established and increasing population: initially high proportion of young birds among nesting Great Grey Owls.
Sonerud, Geir A.; Solheim, Roar; Berg, Trond (Peer reviewed; Journal article, 2020) -
Age, sex and size of dead Tawny Owls Strix aluco found during winter famine 2006.
Solheim, Roar (Journal article; Peer reviewed, 2009) -
Arctic avian predators synchronise their spring migration with the northern progression of snowmelt
Curk, Teja; Pokrovsky, Ivan; Lecomte, Nicolas; Aarvak, Tomas; Brinker, David F.; Burnham, Kurt; Dietz, Andreas; Dixon, Andrew; Franke, Alastair; Gauthier, Gilles; Jacobsen, Karl-Otto; Kidd, Jeff; Lewis, Stephen B.; Øien, Ingar J.; Sokolov, Aleksandr; Sokolov, Vasiliy; Solheim, Roar; Weidensaul, Scott; Wiebe, Karen; Wikelski, Martin; Therrien, Jean-François; Safi, Kamran (Peer reviewed; Journal article, 2020)Migratory species display a range of migration patterns between irruptive (facultative) to regular (obligate), as a response to different predictability of resources. In the Arctic, snow directly influences resource ... -
Behaviour of hybrid male Tetrao tetrix male x T. urogallus female on black grouse and capercaillie display grounds.
Porkert, Jan; Solheim, Roar; Flor, Arne (Journal article; Peer reviewed, 1998) -
Behaviour of hybrid male Tetrao tetrix male X T. urogallus female on black grouse leks.
Porkert, Jan; Solheim, Roar; Flor, Arne (Peer reviewed; Journal article, 1997) -
Density‑dependent winter survival of immatures in an irruptive raptor with pulsed breeding
McCabe, Rebecca A.; Therrien, Jean‑François; Wiebe, Karen; Gauthier, Gilles; Brinker, David; Weidensaul, Scott; Reid, Donald; Doyle, Frank I.; Jacobsen, Karl-Otto; Aarvak, Tomas; Øien, Ingar Jostein; Solheim, Roar; Fitzgerald, Guy; Smith, Norman; Bates, Kirk; Fuller, Mark; Miller, Erica; Elliott, Kyle H. (Journal article; Peer reviewed, 2021)Highly mobile predators can show strong numerical responses to pulsed resources, sometimes resulting in irruptions where large numbers of young invade landscapes at a continental scale. High production of young in irruption ... -
Effects of satellite transmitters on survival in Snowy Owls Bubo scandiacus
Heggøy, Oddvar; Aarvak, Tomas; Øien, Ingar Jostein; Jacobsen, Karl-Otto; Solheim, Roar; Zazelenchuk, Dan; Stoffel, Marten; Kleven, Oddmund (Journal article; Peer reviewed, 2017)The use of tracking devices to monitor birds is extensive, but the effects of such instruments on equipped individuals are still insufficiently taken into account. Here we evaluate potential effects of backpack-mounted ... -
Home range and excursive post-breeding movements of Eurasian Eagle-owls revealed by GPS satellite transmitters
Heggøy, Oddvar; Aarvak, Tomas; Ranke, Peter Sjolte; Solheim, Roar; Øien, Ingar Jostein (Peer reviewed; Journal article, 2021)Investigating space use of wild birds provides important knowledge of bird behavior and ecology, which is crucial in the management and conservation of threatened species. In the present study, we used GPS satellite telemetry ... -
Home range, perching height and reaction to approaching humans by radio-tagged Ural Owls.
Solheim, Roar; Sonerud, Geir Andreas; Strøm, Hallvard (Peer reviewed; Journal article, 2021)Four breeding Ural Owls (Strix uralensis) (one pair, one female and one male) were radiotagged at the nest and tracked on foot with portable equipment in Hedmark county in SE Norway. The owls´ positions were determined by ... -
Individual identification of Snowy Owls (Bubo scandiacus) and Great Grey Owls (Strix nebulosa) based on wing bar patterns.
Solheim, Roar (Journal article; Peer reviewed, 2016) -
Life span, dispersal and age of nesting Great Grey Owls (Strix nebulosa lapponica) in Sweden.
Solheim, Roar; Stefansson, Ove (Journal article; Peer reviewed, 2016)3073 Great Grey Owls were banded in Sweden in 1955– 2012. 416 were controlled at least once (54.6%) or recovereddead (45.4%).Three birds banded as nestlings were recovered in their 17th calendar year. Most birds were ... -
Molt pattern of primaries and secondaries during first and second flight feather molt in Great Grey Owls Strix nebulosa.
Solheim, Roar (Journal article; Peer reviewed, 2011) -
No phylogeographic structure in the circumpolar snowy owls (Bubo scandiacus).
Marthinsen, Gunnhild; Wennerberg, Liv; Solheim, Roar; Lifjeld, Jan Terje (Journal article; Peer reviewed, 2008) -
Range extension of Great Grey Owl in Europe.
Solheim, Roar; Lawicki, L.; Abramcuk, A. V.; Domashevsky, S. V.; Paal, U.; Chodkiewicz, T.; Wozniak, B. (Journal article, 2013) -
Rapport BIOMANG : Tiltak for å bevare og fremme biologisk mangfold på campus Gimlemoen UiA
Lien, Anne; Nygård, Malene Østreng; Bjørnestøl, Katharina Reionn; Gjelsvik, Torill; Lie, Asbjørn; Enoksen, Solveig; Sodeland, Marte; Solheim, Roar (Research report, 2023)Tap av biologisk mangfold er en global krise (Ceballos et al. 2020, Hallmann et al. 2017) som truer samtlige av FNs bærekraftsmål, og UiA har som organisasjon forpliktet seg til å bidra til å nå disse målene. I tillegg til ... -
Snowy Owl (Bubo scandiacus) males select the highest vantage points around nests.
Solheim, Roar; Øien, Ingar Jostein; Aarvak, Tomas; Jacobsen, Karl-Otto (Peer reviewed; Journal article, 2021)In July 2007 we collected a total of 309 Snowy Owl (Bubo scandiacus) pellets from 35 vantage points in an area where we located four Snowy Owl territories in northern Norway. The number of pellets found at each vantage ... -
Snowy Owl hunting behaviour and prey spotting distances revealed by vole lures.
Solheim, Roar (Peer reviewed; Journal article, 2021)When Snowy Owls (Bubo scandiacus) turned up in Finnmark, northern Norway in summer 1993, a vole lure on a line was used to test if the owls would detect, approach and attack the lure in the same way that Great Grey Owls ... -
Status assessment and conservation priorities for a circumpolar raptor: the Snowy Owl Bubo scandiacus
McCabe, Rebecca A.; Aarvak, Tomas; Aebischer, Adrian; Bates, Kirk; Bêty, Joël; Bollache, Loïc; Brinker, David; Driscoll, Cindy; Elliot, Kyle H.; Fitzgerald, Guy; Fuller, M.; Gauthier, Gilles; Gilg, Olivier; Gousy-Leblanc, Marianne; Holt, Denver; Jacobsen, Karl-Otto; Johnson, David; Kulikova, Olga; Lang, Johannes; Lecomte, Nicolas; McClure, Christopher; McDonald, Tom; Menyushina, Irina; Miller, Erica; Morozov, V.V.; Øien, Ingar Jostein; Robillard, Audrey; Rolek, Brian; Sittler, Benoît; Smith, Norman; Sokolov, Alexandr; Sokolova, N.; Solheim, Roar; Soloviev, Mikhail; Stoffel, Marten; Weidensaul, Scott; Wiebe, Karen L.; Zazelenchuck, Dan; Therrien, Jean‑François (Peer reviewed; Journal article, 2024)The global population and status of Snowy Owls Bubo scandiacus are particularly challenging to assess because individuals are irruptive and nomadic, and the breeding range is restricted to the remote circumpolar Arctic ...