Blar i NINA Brage på forfatter "Bårdsen, Bård-Jørgen"

Viser treff 1-20 av 25

    • 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 ...

    • Climate change and the increasing impact of polar bears on bird populations 

      Prop, Jouke; Aars, Jon; Bårdsen, Bård-Jørgen; Hanssen, Sveinn Are; Bech, Claus; Bourgeon, Sophie; Fouw, Jimmy de; Gabrielsen, Geir W.; Lang, Johannes; Noreen, Elin; Oudman, Thomas; Sittler, Benoit; Tombre, Ingunn; Wolters, Eva; Moe, Børge; Stempniewicz, Lech (Peer reviewed; Journal article, 2015)
      The Arctic is becoming warmer at a high rate, and contractions in the extent of sea ice are currently changing the habitats of marine top-predators dependent on ice. Polar bears (Ursus maritimus) depend on sea ice for ...

    • 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 ...

    • Community-wide mesocarnivore response to partial ungulate migration 

      Henden, John-André; Stien, Audun; Bårdsen, Bård-Jørgen; Yoccoz, Nigel Gilles; Ims, Rolf Anker (Journal article, 2014)
      1. Mesocarnivores increase in number and geographic range in human-disturbed ecosystems with cascading negative impact on biodiversity. To mitigate such impacts, it is essential to identify the proximate causes of such ...

    • Community-wide mesocarnivore response to partial ungulate migration 

      Henden, John-André; Stien, Audun; Bårdsen, Bård-Jørgen; Yoccoz, Nigel Gilles; Ims, Rolf Anker (Journal article; Peer reviewed, 2014)
      1.Mesocarnivores increase in number and geographic range in human-disturbed ecosystems with cascading negative impact on biodiversity. To mitigate such impacts, it is essential to identify the proximate causes of such ...

    • 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 ...

    • Effekter av predatorkontroll og klima på bestandsforhold hos ærfugl på Svalbard. Sluttrapport for Svalbards Miljøvernfond 

      Moe, Børge; Hanssen, Sveinn Are; Bårdsen, Bård-Jørgen; Hanssen, Frank Ole; Bourgeon, Sophie; Pavlova, Olga; Nielsen, Carl Petter; Gerland, Sebastian; Gabrielsen, Geir W. (NINA rapport;868, Research report, 2012)
      Moe, B. Hanssen, S.A., Bårdsen, B-J., Hanssen, F., Bourgeon, Pavlova, O., Nielsen, C.P., Gerland, S., & Gabrielsen, G.W. 2012. Effekter av predatorkontroll og klima på bestandsforhold hos ærfugl på Svalbard. NINA Rapport ...

    • Evolutionary responses to a changing climate: Implications for reindeer population viability 

      Bårdsen, Bård-Jørgen (Journal article; Peer reviewed, 2017)
      If we want to understand how climate change affects long-lived organisms, we must know how individuals allocate resources between current reproduction and survival. This trade-off is affected by expected environmental ...

    • Hunting for ecological indicators: are large herbivore skeleton measures from harvest data useful proxies for monitoring? 

      Pedersen, Åshild Ønvik; Bårdsen, Bård-Jørgen; Veiberg, Vebjørn; Irvine, Justin R; Hansen, Brage Bremset (Peer reviewed; Journal article, 2023)
      Hunter-collected data and samples are used as indices of population performance, and monitoring programs often take advantage of such data as ecological indicators. Here, we establish the relationships between measures of ...

    • Impacts of a warming climate on concentrations of organochlorines in a fasting high arctic marine bird: Direct vs. indirect effects? 

      Bustnes, Jan Ove; Bårdsen, Bård-Jørgen; Moe, Børge; Herzke, Dorte; Ballesteros, Manuel; Fenstad, Anette; Borgå, Katrine; Krogseth, Ingjerd Sunde; Eulaers, Igor; Skogeng, Lovise Pedersen; Gabrielsen, Geir Wing; Hanssen, Sveinn Are (Peer reviewed; Journal article, 2023)
      The present study examined how climate changes may impact the concentrations of lipophilic organochlorines (OCs) in the blood of fasting High Arctic common eiders (Somateria mollissima) during incubation. Polychlorinated ...

    • Isbjørnens effekt på fugl i et arktisk klima i endring. Sluttrapport for Svalbards miljøvernfond 

      Moe, Børge; Prop, Jouke; Aars, Jon; Bårdsen, Bård-Jørgen; Hanssen, Sveinn Are; Bech, Claus; Bourgeon, Sophie; Fouw, Jimmy de; Gabrielsen, Geir Wing; Lang, Johannes; Noreen, Elin; Oudman, Thomas; Sittler, Benoit; Stempniewicz, Lech; Tombre, Ingunn; Wolters, Eva (NINA Rapport;1163, Research report, 2015)
      Arktis blir stadig varmere og utbredelsen av havis blir mindre. Det forandrer leveområdet til de mange artene som er avhengige av havis. Isbjørnen er avhengig av havis for å jakte på sel, og økende lengde på den isfrie ...

    • Kartlegging av mulige effekter av vårjakt på ender i Kautokeino. Et pilotprosjekt 

      Bustnes, Jan Ove; Bårdsen, Bård-Jørgen; Jacobsen, Karl-Otto (NINA Rapport;2337, Research report, 2023)
      Bustnes, J.O., Bårdsen, B.-J. & Jacobsen, K.-O. 2023. Kartlegging av mulige effekter av vårjakt på ender i Kautokeino. Et pilotprosjekt. NINA Rapport 2337. Norsk institutt for naturforskning. Vårjakten på ender i Kautokeino ...

    • Multiple stressors: modeling the effect of pollution, climate, and predation on viability of a sub-arctic marine bird 

      Bårdsen, Bård-Jørgen; Hanssen, Sveinn Are; Bustnes, Jan Ove (Journal article; Peer reviewed, 2018)
      Negative effects of long-transported pollutants, such as many persistent organic pollutants (POPs), on seabirds and other top predators have been documented for decades. Yet, the concentrations, and hence, the negative ...

    • Multiple stressors: negative effects of nest predation on the viability of a threatened gull in different environmental conditions 

      Bårdsen, Bård-Jørgen; Bustnes, Jan Ove (Peer reviewed; Journal article, 2022)
      The majority of the world's seabirds show substantial population declines, but a detailed understanding of the phenomenon is lacking. A potentially important mechanism that has received momentum lately is nest predation. ...

    • A natural antipredation experiment: predator control and reduced sea ice increases colony size in a long-lived duck 

      Hanssen, Sveinn Are; Moe, Børge; Bårdsen, Bård-Jørgen; Hanssen, Frank Ole; Gabrielsen, Geir W. (Peer reviewed; Journal article, 2013)
      Anthropogenic impact on the environment and wildlife are multifaceted and far-reaching. On a smaller scale, controlling for predators has been increasing the yield from local natural prey resources. Globally, human-induced ...

    • 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 ...

    • 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 ...

    • Shifts in risk sensitivity and resource availability alter fat stores for a large mammal following extreme winter conditions 

      LaSharr, Tayler N.; Jakopak, Rhiannon P.; Bårdsen, Bård-Jørgen; Robinson, Timothy J.; Dwinnell, Samantha Paige; Randall, Jill; Kaiser, Rusty C.; Thonhoff, Mark; Scurlock, Brandon; Fieseler, Troy; Hymas, Neil; Monteith, Kevin L. (Peer reviewed; Journal article, 2023)
      For species that inhabit environments where resource availability may be unpredictable, balance of resource allocation to life-history traits can have heightened consequences for survival, reproduction, and ultimately, ...

    • Smaller saami herding groups cooperate more in a public goods experiment 

      Thomas, Matthew Gwynfryn; Næss, Marius Warg; Bårdsen, Bård-Jørgen (Journal article; Peer reviewed, 2016)
      Group living often entails a balance between individual selfinterest and benefits to the group as a whole. Situations in which an individual’s vested interests conflict with collective interests are known as social ...

    • Temporal changes in the relative abundance of anadromous Arctic charr, brown trout, and Atlantic salmon in northern Europe: Do they reflect changing climates? 

      Svenning, Martin; Falkegård, Morten; Dempson, J. Brian; Power, Michael; Bårdsen, Bård-Jørgen; Guðbergsson, Gudni; Fauchald, Per (Peer reviewed; Journal article, 2021)
      1. Warming temperatures resulting from climate change may alter the distribution and abundance of many freshwater fish species, especially those in northern latitudes. Owing to interspecific differences in temperature ...