Browsing Scientific publications by Author "Stien, Audun"
Now showing items 1-20 of 20
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A Century of Conservation: The Ongoing Recovery of Svalbard Reindeer
Le Moullec, Mathilde; Pedersen, Åshild Ønvik; Stien, Audun; Rosvold, Jørgen; Hansen, Brage Bremset (Peer reviewed; Journal article, 2019)Several caribou and reindeer (Rangifer tarandus) populations have experienced recent population declines, often attributed to anthropogenic stressors such as harvesting, landscape fragmentation, and climate change. Svalbard ... -
A stage-structured Bayesian hierarchical model for salmon lice populations at individual salmon farms – Estimated from multiple farm data sets
Aldrin, Magne Tommy; Huseby, Ragnar Bang; Stien, Audun; Grøntvedt, Randi Nygaard; Viljugrein, Hildegunn; Jansen, Peder A (Journal article; Peer reviewed, 2017)Salmon farming has become a prosperous international industry over the last decades. Along with growth in the production farmed salmon, however, an increasing threat by pathogens has emerged. Of special concern is the ... -
Behavioral buffering of extreme weather events in a high-Arctic herbivore
Loe, Leif Egil; Hansen, Brage Bremset; Stien, Audun; Albon, Steve D.; Bischof, Richard; Carlsson, Anja M.; Irvine, Justin; Meland, Morten; Rivrud, Inger Maren; Ropstad, Erik; Veiberg, Vebjørn; Mysterud, Atle (Journal article; Peer reviewed, 2016)As global warming advances, there is a growing concern about the impact of extreme weather events on ecosystems. In the Arctic, more frequent unseasonal warm spells and rain-on- snow events in winter cause changes in ... -
Blood may buy goodwill: no evidence for a positive relationship between legal culling and poaching in Wisconsin
Stien, Audun (Journal article; Peer reviewed, 2017)ecology, environmental science -
Climate and density-dependence cause changes in adult sex ratio in a large Arctic herbivore
Peeters, Bart; Veiberg, Vebjørn; Pedersen, Åshild Ønvik; Stien, Audun; Irvine, Robert Justin; Aanes, Ronny; Sæther, Bernt-Erik; Strand, Olav; Hansen, Brage Bremset (Journal article; Peer reviewed, 2017)Peeters, B., V. Veiberg, A. Ø. Pedersen, A. Stien, R. J. Irvine, R. Aanes, B.-E. Sæther, O. Strand, and B. B. Hansen. 2017. Climate and density dependence cause changes in adult sex ratio in a large Arctic herbivore. ... -
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 ... -
Effects of human-induced disturbances and weather on herbivore movement
Leclerc, Martin; Tarroux, Arnaud; Fauchald, Per; Stien, Audun; Tveraa, Torkild; St-Laurent, Martin-Hugues (Journal article, 2019)Human-caused habitat disturbances and climate change are leading threats to biodiversity. Studying the impacts of human activities on wildlife from a behavioral perspective is a relevant starting point to understand the ... -
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 scale modelling of salmon lice (Lepeophtheirus salmonis)infection pressure based on lice monitoring data from Norwegian salmonid farms
Kristoffersen, Anja Bråthen; Jimenez, Daniel Delgado; Viljugrein, Hildegunn; Grøntvedt, Randi; Stien, Audun; Jansen, Peder A (Peer reviewed; Journal article, 2014)Infection by parasitic sea lice is a substantial problem in industrial scale salmon farming. To controlthe problem, Norwegian salmonid farms are not permitted to exceed a threshold level of infection ontheir fish, and farms ... -
Little impact of over-winter parasitism on a free-ranging ungulate in the high Arctic
Carlsson, Anja M.; Albon, Steve D.; Coulson, Stephen J.; Ropstad, Erik; Stien, Audun; Wilson, Kenneth; Loe, Leif Egil; Veiberg, Vebjørn; Irvine, Robert Justin (Journal article; Peer reviewed, 2018)1. Macroparasites have a central place in wildlife ecology because they have the potential to regulate host populations through effects on reproduction and/or survival. However, there remains a paucity of studies that have ... -
More frequent extreme climate events stabilize reindeer population dynamics
Hansen, Brage B.; Gamelon, Marlène; Albon, Steve D.; Lee, Aline M.; Stien, Audun; Irvine, R. Justine; Sæther, Bernt-Erik; Loe, Leif E.; Ropstad, Erik; Veiberg, Vebjørn; Grøtan, Vidar (Journal article, 2019)treme climate events often cause population crashes but are difficult to account for in population-dynamic studies. Especially in long-lived animals, density dependence and demography may induce lagged impacts of ... -
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 ... -
Retrospective growth analysis of the dwarf shrub Cassiope tetragona allows local estimation of vascular plant productivity in high arctic Svalbard
Milner, Jos M.; Stien, Audun; Wal, Rene van der (Journal article; Peer reviewed, 2018)Question: Vascular plant productivity of arctic tundra has often been viewed as varying little between years and thus being largely insensitive to the high inter-annual variation in summer weather conditions. Yet, ... -
The cost of migratory prey: seasonal changes in semi-domesticreindeer distribution influences breeding success of Eurasian lynx in northern Norway
Walton, Zea; Mattisson, Jenny; Linnell, John Durrus; Stien, Audun; Odden, John (Peer reviewed; Journal article, 2016)Migratory prey is a widespread phenomenon that has implications for predator – prey interactions. By creating large temporal variation in resource availability between seasons it becomes challenging for carnivores to ... -
The influence of weather conditions during gestation on life histories in a wild Arctic ungulate
Douhard, Mathieu; Loe, Leif Egil; Stien, Audun; Bonenfant, Christophe; Irvine, R. Justin; Veiberg, Vebjørn; Ropstad, Erik; Albon, Steve D. (Journal article; Peer reviewed, 2016)The internal predictive adaptive response (internal PAR) hypothesis predicts that individuals born in poor conditions should start to reproduce earlier if they are likely to have reduced performance in later life. However, ...