Blar i Publikasjoner fra CRIStin - NINA på forfatter "Tveraa, Torkild"

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    • Beregning av produksjon og tap i reindriften 

      Tveraa, Torkild; Ballesteros, Manuel; Bårdsen, Bård-Jørgen; Fauchald, Per; Lagergren, Madeleine; Langeland, Knut; Pedersen, Elisabeth; Stien, Audun (NINA rapport;938, Research report, 2013)
      Tveraa, T, Ballesteros, M., Bårdsen, B.-J., Fauchald, P., Lagergren, M., Langeland, K., Pedersen, E. & Stien, A. Beregning av produksjon og tap i reindriften – NINA Rapport 938. 38s. En økning i rovdyrbestandene i ...

    • Biodiversity may wax or wane depending on metrics or taxa 

      Yoccoz, Nigel Gilles; Ellingsen, Kari Elsa; Tveraa, Torkild (Journal article; Peer reviewed, 2018)

    • Combined effects of long-term feeding, population density and vegetation green-up on reindeer demography 

      Ballesteros, Manuel; Bårdsen, Bård-Jørgen; Fauchald, Per; Langeland, Knut; Stien, Audun; Tveraa, Torkild (Peer reviewed; Journal article, 2013)
      Abstract. Large herbivores living in seasonal environments are generally food-limited through density dependence and climatic factors. This may result in starvation and increased mortality in winter and reduced fecundity ...

    • Demersal fish assemblages in the boreo-Arctic shelf waters around Svalbard during the warm period 2007–2014 

      Bergstad, Odd Aksel; Johannesen, Edda; Høines, Åge Sigurd; Ellingsen, Kari Elsa; Lien, Vidar Surén; Byrkjedal, Ingvar; Yoccoz, Nigel Gilles; Tveraa, Torkild; Wienerroither, Rupert; Langhelle, Gunnar; Wenneck, Thomas de Lange (Journal article; Peer reviewed, 2017)

    • Effekten av høsting på produksjon og lønnsomhet i reindriften 

      Bårdsen, Bård-Jørgen; Berglann, Helge; Stien, Audun; Tveraa, Torkild (NINA rapport;999, Research report, 2014)
      Bestander av store klovdyr som f.eks. rein Rangifer sp., er regulert og begrenset gjennom ne-gativ tetthetsavhengighet og tilfeldig variasjon i klimatiske forhold. Tetthetsavhengighet og kli-ma påvirker individer av ulike ...

    • End-user involvement to improve predictions and management of populations with complex dynamics and multiple drivers 

      Henden, John-André; Ims, Rolf Anker; Yoccoz, Nigel; Asbjørnsen, Einar Johannes; Stien, Audun; Mellard, Jarad Pope; Tveraa, Torkild; Marolla, Filippo; Jepsen, Jane Uhd (Peer reviewed; Journal article, 2020)
      Sustainable management of wildlife populations can be aided by building models that both identify current drivers of natural dynamics and provide near-term predictions of future states. We employed a Strategic Foresight ...

    • Environmental variation as a driver of predator-prey interactions 

      Tablado, Zulimo; Fauchald, Per; Mabille, Geraldine; Stien, Audun; Tveraa, Torkild (Peer reviewed; Journal article, 2014)
      Animals often face the trade-off of optimizing foraging while limiting predation. In variable and seasonal environments the availability of resources changes spatially and temporally, forcing animals to adapt their spatial ...

    • Large carnivore conservation and traditional pastoralism: A case study on bear–reindeer predation mitigation measures 

      Tallian, Aimee Grace; Støen, Ole-Gunnar; Immerzeel, Bart; Kindberg, Jonas; Ordiz, Andrés; Persson, Lars Thomas; Segerström, Peter; Skarin, Anna; Stokke, Rune; Tveraa, Torkild; Åhman, Birgitta; Frank, Jens (Peer reviewed; Journal article, 2023)
      While wildlife and cultural preservation goals can be either complimentary orcounteractive, the goals of large carnivore conservation and traditional pastoralist lifestyles are often at odds. Livestock depredation can ...

    • Long-term environmental monitoring for assessment of change: measurement inconsistencies over time and potential solutions 

      Ellingsen, Kari Elsa; Yoccoz, Nigel Gilles; Tveraa, Torkild; Hewitt, Judi E.; Thrush, Simon F. (Journal article; Peer reviewed, 2017)
      The importance of long-term environmental monitoring and research for detecting and understanding changes in ecosystems and human impacts on natural systems is widely acknowledged. Over the last decades, a number of critical ...

    • Migration, prospecting, dispersal? What host movement matters for infectious agent circulation? 

      Boulinier, Thierry; Kada, Sarah; Ponchon, Aurore; Dupraz, Marlène; Dietrich, Muriel; Gamble, Amandine; Bourret, Vincent; Duriez, Olivier; Bazire, Romain; Tornos, Jéremy; Tveraa, Torkild; Chambert, Thierry; Garnier, Romain; McCoy, Karen D. (Peer reviewed; Journal article, 2016)
      Spatial disease ecology is emerging as a new field that requires the integration of complementary approaches to address how the distribution and movements of hosts and parasites may condition the dynamics of their interactions. ...

    • Modellering av tap av tamrein til rovvilt - en risikomodell 

      Herfindal, Ivar; Brøseth, Henrik; Kjørstad, Morten Andre; Linnell, John Durrus; Odden, John; Persson, Jens; Stien, Audun; Tveraa, Torkild; Ersson, L. (NINA rapport;819, Research report, 2012)
      Herfindal, I., Brøseth, H., Kjørstad, M., Linnell, J. D., Odden, J., Persson, J., Stien, A., Tveraa, T. & Ersson, L. 2012. Modellering av tap av tamrein til rovvilt – en risikomodell. – NINA Rapport 819. 33 s. I januar ...

    • Nonlinear spatial and temporal decomposition provides insight for climate change effects on sub-Arctic herbivore populations 

      Correia, Hannah E.; Tveraa, Torkild; Stien, Audun; Yoccoz, Nigel (Peer reviewed; Journal article, 2022)
      Global temperatures are increasing, afecting timing and availability of vegetation along with relationships between plants and their consumers. We examined the efect of population density, herd body condition in the previous ...

    • Population densities, vegetation green-up, and plant productivity: impacts on reproductive success and juvenile body mass in reindeer 

      Tveraa, Torkild; Stien, Audun; Bårdsen, Bård-Jørgen; Fauchald, Per (Peer reviewed; Journal article, 2013)
      Global warming is expected to cause earlier springs and increased primary productivity in the Arctic. These changes may improve food availability for Arctic herbivores, but may also have negative effects by generating a ...

    • Rangifer management controls a climate-sensitive tundra state transition 

      Bråthen, Kari Anne; Ravolainen, Virve Tuulia; Stien, Audun; Tveraa, Torkild; Ims, Rolf Anker (Journal article; Peer reviewed, 2017)
      Rangifer (caribou/reindeer) management has been suggested to mitigate the temperature- driven transition of Arctic tundra into a shrubland state, yet how this happens is uncertain. Here we study this much focused ecosystem ...

    • Reindeer behavioural ecology and use of pastures in pastoral livelihoods 

      Skarin, Anna; Kumpula, Jouko; Tveraa, Torkild; Åhman, Birgitta (Chapter, 2022)
      Reindeer pastoralists have, for centuries, followed free-roaming animals throughout the Eurasian Arctic. The closing of national borders about a century ago forced the reindeer pastoralists to adapt to new conditions. ...

    • Rovvilt og reindrift. Kunnskapsstatus i Finnmark 

      Tveraa, Torkild; Ballesteros, Manuel; Bårdsen, Bård-Jørgen; Fauchald, Per; Lagergren, Madeleine; Langeland, Knut; Pedersen, Elisabeth; Stien, Audun (NINA rapport;821, Research report, 2012)
      Tveraa, T, Ballesteros, M., Bårdsen, B.-J., Fauchald, P., Lagergren, M., Langeland, K., Pedersen, E. & Stien, A. Rovvilt og reindrift – Kunnskapsstatus i Finnmark – NINA Rapport 821. 28 s. Tap av rein kan ha flere ...

    • SEAPOP studies in the Barents and Norwegian Seas in 2007 

      Anker-Nilssen, Tycho; Barrett, Robert T; Bustnes, J.O.; Christensen-Dalsgaard, Signe; Erikstad, K.E.; Fauchald, Per; Lorentsen, Svein-Håkon; Steen, Harald; Strøm, H.; Systad, Geir Helge; Tveraa, Torkild (NINA Rapport;363, Research report, 2008)
      Anker-Nilssen, T. (ed.), Barrett, R.T., Bustnes, J.O., Christensen-Dalsgaard, S., Erikstad, K.E., Fauchald, P., Lorentsen, S.-H., Steen, H., Strøm, H., Systad, G.H. & Tveraa, T. 2008. SEAPOP studies in the Barents and ...

    • SEAPOP studies in the Lofoten and Barents Sea area in 2005 

      Anker-Nilssen, Tycho; Barrett, Robert T; Bustnes, Jan Ove; Erikstad, Kjell E; Fauchald, Per; Lorentsen, Svein Håkon; Steen, Harald; Strøm, Hallvard; Systad, Geir Helge Rødli; Tveraa, Torkild (NINA Rapport;127, Research report, 2006)
      Anker-Nilssen, T., Barrett, R.T., Bustnes, J.O., Erikstad, K.E., Fauchald, P., Lorentsen, S.-H., Steen, H., Strøm, H., Systad, G.H. & Tveraa, T. 2006. SEAPOP studies in the Lofoten and Barents Sea area in 2005. - NINA ...

    • SEAPOP studies in the Lofoten and Barents Sea area in 2006 

      Anker-Nilssen, Tycho; Barrett, Robert T; Bustnes, Jan Ove; Erikstad, Kjell Einar; Fauchald, Per; Lorentsen, Svein-Håkon; Steen, Harald; Strøm, Hallvard; Systad, Geir Helge; Tveraa, Torkild (NINA Rapport;249, Research report, 2007)
      Anker-Nilssen, T., Barrett, R.T., Bustnes, J.O., Erikstad, K.E., Fauchald, P., Lorentsen, S.-H., Steen, H., Strøm, H., Systad, G.H. and Tveraa, T. 2007. SEAPOP studies in the Lofoten and Barents Sea area in 2006. – NINA ...

    • Spring phenology shapes the spatial foraging behavior of Antarctic petrels 

      Fauchald, Per; Tarroux, Arnaud; Tveraa, Torkild; Cherel, Yves; Ropert-Coudert, Yan; Kato, Akiko; Love, Oliver P.; Varpe, Øystein; Descamps, Sébastien (Journal article; Peer reviewed, 2017)
      In polar seas, the seasonal melting of ice triggers the development of an open-water ecosystem characterized by short-lived algal blooms, the grazing and development of zooplankton, and the influx of avian and mammalian ...