Blar i NTNU Open på forfatter "Hansen, Brage Bremset"

Viser treff 21-40 av 59

    • Effects of Experimental Winter Warming on Trade-offs Between Growth and Reproduction in High Arctic shrubs 

      Helløy, Iselin (Master thesis, 2022)
      Arktis varmes fortere enn det globale gjennomsnittet, og frekvensen av ekstremvær om vinteren øker. Bakkeis og tine-fryse episoder er to mulige utfall av ekstreme varmeperioder på vinteren og vinterregn. Disse kan dekke ...

    • Environmental correlates of variation in a holistic analysis of annual offspring production in the high Arctic songbird snow bunting (Plectrophenax nivalis) on Spitsbergen 

      Egil Lillehaug (Master thesis, 2019)
      Klima og vær er viktige abiotiske faktorer som påvirker organismer, spesielt i områder med store værforskjeller, som Arktis. Hvordan været påvirker reproduksjonssuksessen til en fugl som hekker der er spesielt interessant ...

    • Environmental effects on spatial population dynamics and synchrony – lessons from northern ecosystems 

      Herfindal, Ivar; Lee, Aline Magdalena; Marquez, Jonatan; Le Moullec, Mathilde; Peeters, Bart; Hansen, Brage Bremset; Henden, John-André; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)
      Environmental variation in time and space generates complex patterns in the spatial structure of temporally covarying populations. Accounting for spatial population structure is important for sustainable management and ...

    • Experimental icing affects growth, mortality, and flowering in a high Arctic dwarf shrub 

      Milner, Jos M; Varpe, Øystein; van der Wal, René; Hansen, Brage Bremset (Peer reviewed; Journal article, 2016)
      Effects of climate change are predicted to be greatest at high latitudes, with more pronounced warming in winter than summer. Extreme mid-winter warm spells and heavy rain-on-snow events are already increasing in frequency ...

    • Extreme events, trophic chain reactions, and shifts in phenotypic selection 

      Layton-Matthews, Kate; Vriend, Stefan J.G.; Grøtan, Vidar; Loonen, Maarten J. J. E.; Sæther, Bernt-Erik; Fuglei, Eva; Hansen, Brage Bremset (Peer reviewed; Journal article, 2023)
      Demographic consequences of rapid environmental change and extreme climatic events (ECEs) can cascade across trophic levels with evolutionary implications that have rarely been explored. Here, we show how an ECE in high ...

    • Family planning in the high Arctic: earlier spring onset advances age at first successful reproduction in barnacle geese 

      Fjelldal, Mari Aas (Master thesis, 2018)
      I en verden under oppvarming der arter møter nye miljøforandringer er evalueringen av klimaeffekter på individnivå gjennom livshistorie egenskaper viktig for å forstå langtids- utsiktene til naturlige populasjoner. ...

    • Five decades of terrestrial and freshwater research at Ny-Ålesund, Svalbard 

      Pedersen, Åshild Ønvik; Convey, P.; Newsham, Kevin K.; Mosbacher, Jesper Bruun; Fuglei, Eva; Ravolainen, Virve; Hansen, Brage Bremset; Jensen, Thomas Correll; Augusti, A.; Biersma, Elisabeth Mackteld; Cooper, Elisabeth J.; Coulson, S.J.; Gabrielsen, Geir W.; Gallet, Jean-Charles; Karsten, U.; Kristiansen, Silje Marie; Svenning, Mette Marianne; Tveit, Alexander; Uchida, M.; Baneschi, I.; Calizza, E.; Cannone, N.; de Goede, E.M.; Doveri, M.; Elster, J.; Giamberini, M.S.; Hayashi, K.; Lang, Simone; Lee, Y.K.; Nakatsubo, T.; Pasquali, V.; Paulsen, I.M.G.; Pedersen, Christina Alsvik; Peng, F.; Provenzale, A.; Pushkareva, E.; Sandström, C.A.M.; Sklet, Vera; Stach, A.; Tojo, M.; Tytgat, B.; Tømmervik, Hans; Velazquez, D.; Verleyen, E.; Welker, J.M.; Yao, Y.-F.; Loonen, M.J.J.E. (Peer reviewed; Journal article, 2022)
      For more than five decades, research has been conducted at Ny-Ålesund, in Svalbard, Norway, to understand the structure and functioning of High- Arctic ecosystems and the profound impacts on them of environmental change. ...

    • Generation time and seasonal migration explain variation in spatial population synchrony across European bird species 

      Martin, Ellen Claire; Hansen, Brage Bremset; Lee, Aline Magdalena; Herfindal, Ivar (Peer reviewed; Journal article, 2023)
      Spatial population synchrony is common among populations of the same species and is an important predictor of extinction risk. Despite the potential consequences for metapopulation persistence, we still largely lack ...

    • Genomic consequences of anthropogenic reintroduction in high-arctic Svalbard reindeer 

      Burnett, Hamish (Master thesis, 2020)
      Anthropogenic reintroductions are a commonly used conservation strategy following local extirpations. However, establishing new populations with a small number of founders can result in population bottlenecks causing reduced ...

    • Growth rings show limited evidence for ungulates’ potential to suppress shrubs across the Arctic 

      Vuorinen, Katariina Elsa Maria; Austrheim, Gunnar; Tremblay, Jean-Pierre; Myers-Smith, Isla H.; Hortman, Hans Ivar; Frank, Peter; Barrio, Isabel C.; Dalerum, Fredrik; Björkman, Mats Peter; Björk, Robert G.; Ehrich, Dorothee; Sokolov, Aleksandr; Sokolova, Natalya; Ropars, Pascale; Boudreau, Stephane; Normand, Signe; Prendin, Angela L.; Schmidt, Niels Martin; Pacheco-Solana, Arturo; Post, Eric; John, Christian; Kerby, Jeff; Sullivan, Patrick F.; Le Moullec, Mathilde; Hansen, Brage Bremset; van der Wal, René; Pedersen, Åshild Ønvik; Sandal, Lisa; Gough, Laura; Young, Amanda; Li, Bingxi; Magnusson, Runa I.; Sass-Klaassen, Ute; Buchwal, Agata; Welker, Jeffrey; Grogan, Paul; Andruko, Rhett; Morrissette-Boileau, Clara; Volkovitskiy, Alexander; Terekhina, Alexandra; Speed, James David Mervyn (Peer reviewed; Journal article, 2022)
      Global warming has pronounced effects on tundra vegetation, and rising mean temperatures increase plant growth potential across the Arctic biome. Herbivores may counteract the warming impacts by reducing plant growth, but ...

    • Habituation to humans in a predator-free wild ungulate 

      Hansen, Brage Bremset; Aanes, Ronny (Journal article; Peer reviewed, 2014)
      Arctic caribou and reindeer face an increase in human activity, tourism and infrastructure, which impact may depend on the potential for habituation. Habituation to nonlethal human disturbance in wild animals depends on ...

    • Harvesting can stabilise population fluctuations and buffer the impacts of extreme climatic events 

      Peeters, Bart; Grøtan, Vidar; Gamelon, Marlène; Veiberg, Vebjørn; Lee, Aline Magdalena; Fryxell, John M.; Albon, Steve D.; Sæther, Bernt-Erik; Engen, Steinar; Loe, Leif Egil; Hansen, Brage Bremset (Peer reviewed; Journal article, 2022)
      Harvesting can magnify the destabilising effects of environmental perturbations on population dynamics and, thereby, increase extinction risk. However, population-dynamic theory predicts that impacts of harvesting depend ...

    • High seasonal overlap in habitat suitability in a nonmigratory High Arctic ungulate 

      Pedersen, Åshild Ønvik; Soininen, Eeva M; Hansen, Brage Bremset; Le Moullec, Mathilde; Loe, Leif Egil; Paulsen, I.M.G.; Eischeid, Isabell; Karlsen, Stein Rune; Ropstad, Erik; Stien, Audun; Tarroux, Arnaud; Tømmervik, Hans; Ravolainen, Virve (Peer reviewed; Journal article, 2023)
      Understanding drivers of space use and habitat selection is essential for management and conservation, especially under rapid environmental change. Here, we develop summer and winter habitat suitability models for the ...

    • 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 ...

    • Kelp and seaweed feeding by High-Arctic wild reindeer under extreme winter conditions 

      Hansen, Brage Bremset; Aanes, Ronny (Journal article; Peer reviewed, 2012)
      One challenge in current Arctic ecological research is to understand and predict how wildlife may respond to increased frequencies of “extreme” weather events. Heavy rain-on-snow (ROS) is one such extreme phenomenon ...

    • Long-term herbivore removal experiments reveal how geese and reindeer shape vegetation and ecosystem CO2-fluxes in high-Arctic tundra 

      Petit Bon, Matteo; Hansen, Brage Bremset; Loonen, M. J. J. E; Petraglia, Alessandro; Bråthen, Kari Anne; Böhner, Hanna; Layton-Matthews, Kate; Beard, Karen H.; Le Moullec, Mathilde; Jonsdottir, Ingibjorg Svala; Van der Wal, René (Peer reviewed; Journal article, 2023)
      1. Given the current rates of climate change, with associated shifts in herbivore population densities, understanding the role of different herbivores in ecosystem functioning is critical for predicting ecosystem responses. ...

    • The Moran effect revisited: spatial population synchrony under global warming 

      Hansen, Brage Bremset; Grøtan, Vidar; Herfindal, Ivar; Lee, Aline Magdalena (Peer reviewed; Journal article, 2020)
      The world is spatially autocorrelated. Both abiotic and biotic properties are more similar among neighboring than distant locations, and their temporal co-fluctuations also decrease with distance. P. A. P. Moran realized ...

    • More frequent extreme climate events stabilize reindeer population dynamics 

      Hansen, Brage Bremset; Gamelon, Marlène; Albon, Steve D.; Lee, Aline Magdalena; Stien, Audun; Irvine, Robert Justin; Sæther, Bernt-Erik; Loe, Leif Egil; Ropstad, Erik; Veiberg, Vebjørn; Grøtan, Vidar (Journal article; Peer reviewed, 2019)
      Extreme 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 ...

    • The neglected season: Warmer autumns counteract harsher winters and promote population growth in Arctic reindeer 

      Loe, Leif Egil; Liston, Glen E.; Pigeon, Gabriel; Barker, Kristin; Horvitz, Nir; Stien, Audun; Forchhammer, Mads C.; Getz, Wayne M.; Irvine, Robert Justin; Lee, Aline Magdalena; Movik, Lars K.; Mysterud, Atle; Pedersen, Åshild Ønvik; Reinking, Adele K.; Ropstad, Erik; Trondrud, Liv Monica; Tveraa, Torkild; Veiberg, Vebjørn; Hansen, Brage Bremset; Albon, Steve D. (Peer reviewed; Journal article, 2020)
      Arctic ungulates are experiencing the most rapid climate warming on Earth. While concerns have been raised that more frequent icing events may cause die-offs, and earlier springs may generate a trophic mismatch in phenology, ...

    • No evidence of overall changes in spatial population synchrony across bird species in North America 

      Karlsen, Simen Christen (Master thesis, 2022)
      Populasjoner med sterkt korrelerte årlige fluktuasjoner i populasjonsstørrelse, har høy romlig populasjonssynkronitet. Dette øker ofte risikoen for utryddelse hos en art. Romlig autokorrelasjon i miljøstøy (eks. fluktuasjoner ...