Blar i NTNU Open på forfatter "Hofgaard, Annika"

Viser treff 1-11 av 11

    • Background invertebrate herbivory on dwarf birch (Betula glandulosa-nana complex) increases with temperature and precipitation across the tundra biome 

      Barrio, Isabel C.; Lindén, Elin; te Beest, Mariska; Olofsson, Johan; Rocha, Adrian; Soininen, Eeva M; Alatalo, Juha M.; Andersson, Tommi; Asmus, Ashley; Boike, Julia; Bråthen, Kari Anne; Bryant, John P.; Buchwal, Agata; Bueno, C. Guillermo; Christie, Katherine S.; Denisova, Yulia V.; Egelkraut, Dagmar; Ehrich, Dorothee; Fishback, LeeAnn; Forbes, Bruce C.; Gartzia, Maite; Grogan, Paul; Hallinger, Martin; Heijmans, Monicque M.P.D.; Hik, David S.; Hofgaard, Annika; Holmgren, Milena; Høye, Toke T.; Huebner, Diane C.; Jonsdottir, Ingibjørg; Kaarlejärvi, Elina; Kumpula, Timo; Lange, Cynthia Y.M.J.G.; Lange, Jelena; Lévesque, Esther; Limpens, Juul; Macias-Fauria, Marc; Myers-Smith, Isla; Van Nieukerken, Erik J.; Normand, Signe; Post, Eric S.; Schmidt, Niels Martin; Sitters, Judith; Skoracka, Anna; Sokolov, Alexander; Sokolova, Natalya; Speed, James David Mervyn; Street, Lorna E.; Sundqvist, Maja K.; Suominen, Otso; Tananaev, Nikita; Tremblay, Jean-Pierre; Urbanowicz, Christine; Uvarov, Sergey A.; Watts, David; Wilmking, Martin; Wookey, Philip A.; Zimmermann, Heike H.; Zverev, Vitali; Kozlov, Mikhail V. (Journal article; Peer reviewed, 2017)
      Chronic, low intensity herbivory by invertebrates, termed background herbivory, has been understudied in tundra, yet its impacts are likely to increase in a warmer Arctic. The magnitude of these changes is however hard to ...

    • Change in vegetation composition and growth in the forest-tundra ecotone – effects of climate warming and herbivory 

      Løkken, Jørn Olav (Doctoral theses at NTNU;2020:321, Doctoral thesis, 2020)
      Overgangen mellom tett skog og fjellområder, skog-tundra-økotonen, er globalt sett i stor grad regulert av temperatur. Økt temperatur som følge av klimaendringer forventes å påvirke økotonen, med høydeforflytning av ...

    • Circum-Arctic distribution of chemical anti-herbivore compounds suggests biome-wide trade-off in defence strategies in Arctic shrubs 

      Lindén, Elin; te Beest, Mariska; Aubreu, Ilka; Moritz, Thomas; Sundqvist, Maja K.; Barrio, Isabel C.; Boike, Julia; Bryant, John P.; Bråthen, Kari Anne; Buchwal, Agata; Bueno, C. Guillermo; Currier, Alain; Egelkraut, Dagmar Dorothea; Forbes, Bruce C.; Hallinger, Martin; Heijmans, Monique; Hermanutz, Luise; Hik, David S.; Hofgaard, Annika; Holmgren, Milena; Huebner, Diane C.; Høye, Toke T.; Jónsdóttir, Ingibjörg S.; Kaarlejärvi, Elina; Kissler, Emilie; Kumpula, Timo; Limpens, Juul; Myers-Smith, Isla H.; Normand, Signe; Post, Eric; Rocha, Adrian V.; Schmidt, Niels Martin; Skarin, Anna; Soininen, Eeva M; Sokolov, Aleksandr; Sokolova, Natalia; Speed, James David Mervyn; Street, Lorna E.; Tananaev, Nikita; Tremblay, Jean-Pierre; Urbanowicz, Christine; Watts, David A.; Zimmermann, Heike H.; Olofsson, Johan (Peer reviewed; Journal article, 2022)
      Spatial variation in plant chemical defence towards herbivores can help us understand variation in herbivore top–down control of shrubs in the Arctic and possibly also shrub responses to global warming. Less defended, ...

    • Limited decadal growth of mountain birch saplings has minor impact on surrounding tundra vegetation 

      Scharn, Ruud; Negri, Isabel S.; Sundqvist, Maja K.; Løkken, Jørn Olav; Bacon, Christine D.; Antonelli, Alexandre; Hofgaard, Annika; Nilsson, R. Henrik; Björk, Robert G. (Peer reviewed; Journal article, 2022)
      Temperatures over the Arctic region are increasing at three times the rate of the global average. Consequently, Arctic vegetation is changing and trees are encroaching into the tundra. In this study, we examine the ...

    • Non-stationary Response of Tree Growth to Climate Trends Along the Arctic Margin 

      Hofgaard, Annika; Ols, Clementine; Drobyshev, Igor; Kirchhefer, Andreas J.; Sandberg, Staffan; Söderström, Lars (Journal article; Peer reviewed, 2018)
      Climate change modulates cold-marginal forest ecosystems through changing growth constraints. Understanding spatiotemporal variations in climate– growth relationships is essential to project forest ecosystem dynamics, and ...

    • Plant functional trait change across a warming tundra biome 

      Bjorkman, Anne D.; Myers-Smith, Isla H.; Elmendorf, Sarah C.; Normand, Signe; Rüger, Nadja; Beck, Pieter S. A.; Blach-Overgaard, Anne; Blok, Daan; Cornelissen, J. Hans C.; Forbes, Bruce C.; Georges, Damien; Goetz, Scott J.; Guay, Kevin C.; Henry, Gregory H.R.; HilleRisLambers, Janneke; Hollister, Robert D.; Karger, Dirk N.; Kattge, Jens; Manning, Peter; Prevéy, Janet S.; Rixen, Christian; Schaepman-Strub, Gabriela; Thomas, Haydn J.D.; Vellend, Mark; Wilmking, Martin; Wipf, Sonja; Carbognani, Michele; Hermanutz, Luise; Lévesque, Esther; Molau, Ulf; Petraglia, Alessandro; Soudzilovskaia, Nadejda A.; Spasojevic, Marko J.; Tomaselli, Marcello; Vowles, Tage; Alatalo, Juha M.; Alexander, Heather D.; Anadon-Rosell, Alba; Angers-Blondin, Sandra; te Beest, Mariska; Berner, Logan; Björk, Robert G.; Buchwal, Agata; Buras, Allan; Christie, Katherine; Cooper, Elisabeth J.; Dullinger, Stefan; Elberling, Bo; Eskelinen, Anu; Frei, Esther R.; Grau, Oriol; Grogan, Paul; Hallinger, Martin; Semenschuk, Philipp; Speed, James David Mervyn; Hofgaard, Annika (Journal article; Peer reviewed, 2018)
      The tundra is warming more rapidly than any other biome on Earth, and the potential ramifications are far-reaching because of global feedback effects between vegetation and climate. A better understanding of how environmental ...

    • Snow Depth Alteration and Vegetation Cover Effects on Invertebrate Communities in Headwater Streams. 

      Aspaas, Aina Mærk (Master thesis, 2014)
      Climate change is expected to influence both snow cover and vegetation cover in the boreal zone. The length, duration and continuity of the snow cover during winter is expected to be altered, leading to increased occurrence ...

    • Snow Depth and Vegetation Cover Effects on Ecological Functioning in Headwater Streams 

      Eikland, Knut Andreas (Master thesis, 2014)
      I studied the possible effects of reduced snow depth on ecological functioning including ecological processes like algal growth and the rates of grazing and decomposition in boreal headwater streams in the Dovre Mountains ...

    • Spatiotemporal variation in the relationship between boreal forest productivity proxies and climate data 

      Ols, Clementine; Kålås, Ingvil Henden; Drobyshev, Igor; Söderström, Lars; Hofgaard, Annika (Peer reviewed; Journal article, 2019)
      The impacts of climate change on high-latitude forest ecosystems are still uncertain. Divergent forest productivity trends have recently been reported both at the local and regional level challenging the projections of ...

    • Temporal and Spatial Variation in Correspondence between Climate Proxies and Recorded Climate Data 

      Kålås, Ingvil Henden (Master thesis, 2015)
      Knowledge about effects of regional climate variation on the vegetation is important and will provide more insight into the impacts of global climate change. Tree growth and Normalized Difference Vegetation Index (NDVI) ...

    • Tree recruitment in the Forest-tundra Ecotone: Limitation and facilitation processes in contrasting climatic Regions 

      Albertsen, Elena (Master thesis, 2012)
      Aim: The aim of this study was to analyse how abiotic and biotic constraint and facilitation agents determine tree recruitment in the alpine zone in climatically different regions as well as across species; Birch, pine and ...