Now showing items 321-340 of 1521

    • 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 (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-30)
      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, non-resinous shrubs could be more influenced by herbivores than more defended, resinous shrubs. However, sparse field measurements limit our current understanding of how much of the ...
    • Constructs of project programme management supporting open innovation at the strategic level of the organisation 

      Trzeciak, Mateusz; Kopec, Tomasz Piotr; Kwilinski, Aleksy (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-19)
      The main aim of the article is to fill the gap concerning the recognition of constructs of programme management supporting open innovations. Current knowledge on this subject is mainly limited to identifying success factors of open innovation and programme management. In the current literature, there are few publications indicating the use of the programme as a tool supporting innovation. In ...
    • Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model 

      Pedersen, Torstein (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-04)
      The trophic position concept is central in system ecology, and in this study, trophic position (TP) estimates from stable-isotopes and an Ecopath mass-balance food web model for the Barents Sea were compared. Two alternative models for estimating TP from stable isotopes, with fixed or scaled trophic fractionation were applied. The massbalance model was parametrized and balanced for year 2000, was ...
    • Spatial variation in mercury concentrations in polar bear (Ursus maritimus) hair from the Norwegian and Russian Arctic 

      Lippold, Anna; Boltunov, Andrei; Aars, Jon; Andersen, Magnus; Blanchet, Marie-Anne; Dietz, Rune; Eulaers, Igor; Morshina, Tamara N.; Sevastyanov, Vyacheslav S.; Welker, Jeffrey M.; Routti, Heli Anna Irmeli (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-02)
      We examined spatial variation in total mercury (THg) concentrations in 100 hair samples collected between 2008 and 2016 from 87 polar bears (Ursus maritimus) from the Norwegian (Svalbard Archipelago, western Barents Sea) and Russian Arctic (Kara Sea, Laptev Sea, and Chukchi Sea). We used latitude and longitude of home range centroid for the Norwegian bears and capture position for the Russian bears ...
    • What are the effects of herbivore diversity on tundra ecosystems? A systematic review protocol 

      Barrio, Isabel C.; Barbero-Palacios, Laura; Kaarlejärvi, Elina; Speed, James David Mervyn; Heiðmarsson, Starri; Hik, David S.; Soininen, Eeva M (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-31)
      Background: Changes in the diversity of herbivore communities can strongly infuence the functioning of northern ecosystems. Diferent herbivores have diferent impacts on ecosystems because of diferences in their diets, behaviour and energy requirements. The combined efects of diferent herbivores can in some cases compensate each other but lead to stronger directional changes elsewhere. However, ...
    • The importance of turbulent ocean–sea ice nutrient exchanges for simulation of ice algal biomass and production with CICE6.1 and Icepack 1.2 

      Duarte, Pedro; Assmy, Philipp; Campbell, Karley; Sundfjord, Arild (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-31)
      Different sea ice models apply unique approaches in the computation of nutrient diffusion between the ocean and the ice bottom, which are generally decoupled from the calculation of turbulent heat flux. A simple molecular diffusion formulation is often used. We argue that nutrient transfer from the ocean to sea ice should be as consistent as possible with heat transfer, since all of these fluxes ...
    • Small Arctic rivers transport legacy contaminants from thawing catchments to coastal areas in Kongsfjorden, Svalbard 

      Mcgovern, Maeve; Borgå, Katrine; Heimstad, Eldbjørg Sofie; Ruus, Anders; Christensen, Guttorm; Evenset, Anita (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-29)
      Decades of atmospheric and oceanic long-range transport from lower latitudes have resulted in deposition and storage of persistent organic pollutants (POPs) in Arctic regions. With increased temperatures, melting glaciers and thawing permafrost may serve as a secondary source of these stored POPs to freshwater and marine ecosystems. Here, we present concentrations and composition of legacy POPs in ...
    • Down-regulation of the bacterial protein biosynthesis machinery in response to weeks, years, and decades of soil warming 

      Söllinger, Andrea; Séneca, Joana; Mathilde, Borg Dahl; Motleleng, Liabo Lillien; Prommer, Judith; Verbruggen, Erik; Sigurdsson, Bjarni D.; Janssens, Ivan A.; Peñuelas, Josep; Urich, Tim; Richter, Andreas; Tveit, Alexander (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-25)
      How soil microorganisms respond to global warming is key to infer future soil-climate feedbacks, yet poorly understood. Here, we applied metatranscriptomics to investigate microbial physiological responses to mediumterm (8 years) and long-term (>50 years) subarctic grassland soil warming of +6°C. Besides indications for a community-wide up-regulation of centralmetabolic pathways and cell replication, ...
    • Surface aggregations of Calanus finmarchicus during the polar night 

      Espinasse, Boris Dristan; Daase, Malin; Halvorsen, Elisabeth; Reigstad, Marit; Berge, Jørgen; Basedow, Sünnje Linnéa (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-16)
      While marine ecosystems in polar areas were thought to be mostly inactive during the polar night, recent observations in the Arctic highlight that dynamic biological interactions occur across all trophic levels. One particularly interesting observation made repeatedly is the occurrence of Calanus finmarchicus, a key species at the base of the food web, in the upper part of the water column in early ...
    • International megabenthic long-term monitoring of a changing arctic ecosystem: Baseline results 

      Jørgensen, Lis Lindal; Logerwell, Elizabeth A.; Strelkova, Natalia; Zakharov, Denis; Roy, Virginie; Nozères, Claude; Bluhm, Bodil; Hilma Ólafsdóttir, Steinunn; Burgos, Julian M.; Sørensen, Jan; Zimina, Olga; Rand, Kimberly (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-24)
      The sustainable development and environmental protection of the Arctic ecosystem is on the agenda globally. The Convention of Biological Diversity (CBD) and the UN Sustainable Development Goals call for conserving at least 10 per cent of coastal and marine areas globally. Management tools to achieve this goal include marine protected areas (MPAs) and “other effective area-based conservation ...
    • Reindeer behavioural ecology and use of pastures in pastoral livelihoods 

      Skarin, Anna; Kumpula, Jouko; Tveraa, Torkild; Åhman, Birgitta (Chapter; Bokkapittel, 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. Today, environmental conditions are changing rapidly with climate and land use change. Local history, migration and pasture use strategies of reindeer herding, and also the biogeography ...
    • Academic development through a collective approach – introducing peer observation of teaching in a multidisciplinary faculty 

      Sundset, Monica Alterskjær; Sandvoll, Ragnhild (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-03)
      Peer observation of teaching is seen as a significant feature of professional development in higher education, aiming to improve teaching and learning. This qualitative case study explores how peer observation can be introduced at a multidisciplinary faculty with STEM and business educations, identifying opportunities and challenges experienced when colleagues participate in peer observation. A peer ...
    • Inkoo and Sindbis viruses in blood sucking insects, and a serological study for Inkoo virus in semi-domesticated Eurasian tundra reindeer in Norway 

      Shakya, Ruchika; Tryland, Morten; Vikse, Rose; Romano, Javier Sánchez; Åsbakk, Kjetil; Nymo, Ingebjørg Helena; Mehl, Reidar Arne; Evander, Magnus; Ahlm, Clas; Vapalahti, Olli; Lwande, Olivia Wesula; Putkuri, Niina; Johansen, Wenche; Soleng, Arnulf; Edgar, Kristin Skarsfjord; Andreassen, Åshild Kristine (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-03)
      Background: Mosquito-borne viruses pose a serious threat to humans worldwide. There has been an upsurge in the number of mosquito-borne viruses in Europe, mostly belonging to the families Togaviridae, genus Alphavirus (Sindbis, Chikungunya), Flaviviridae (West Nile, Usutu, Dengue), and Peribunyaviridae, genus Orthobunyavirus, California serogroup (Inkoo, Batai, Tahyna). The principal focus of this ...
    • Micro- and macro-habitat selection of Atlantic salmon, (Salmo salar), post-smolts in relation to marine environmental cues 

      Jensen, Jenny Lovisa Alexandra; Strøm, John Fredrik; Nikolopoulos, Anna; Primicerio, Raul; Skardhamar, Jofrid; Atencio, Benjamin J.; Strand, Jo Espen Tau; Bjørn, Pål Arne; Bøhn, Thomas (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-20)
      Atlantic salmon is an economically and culturally important species. The species encounters several natural and man-made threats during its migration between fresh water and the ocean, which in combination may explain its ongoing decline. With the aim to better understand whether post-smolt behaviour is influenced by physical oceanographic conditions, the migratory behaviour of 173 post-smolts in a ...
    • Cercariae of a Bird Schistosome Follow a Similar Emergence Pattern under Different Subarctic Conditions: First Experimental Study 

      Soldánová, Miroslava; Born-Torrijos, Ana; Kristoffersen, Roar; Knudsen, Rune; Amundsen, Per-Arne; Scholz, Tomas (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-03)
      The emergence of cercariae from infected mollusks is considered one of the most important adaptive strategies for maintaining the trematode life cycle. Short transmission opportunities of cercariae are often compensated by periodic daily rhythms in the cercarial release. However, there are virtually no data on the cercarial emergence of bird schistosomes from freshwater ecosystems in northern ...
    • The Sub-Ice Algal Communities of the Barents Sea Pack Ice: Temporal and Spatial Distribution of Biomass and Species 

      Hegseth, Else Nøst; von Quillfeldt, Cecilie (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-27)
      This work summarizes ice algal studies, presented as biomass and species temporal and spatial distribution, during 11 cruises conducted between 1986 and 2012. The majority of the biomass was found as loosely attached sub-ice algal layers, and sampling required diving. A maximum of 40 mg chlorophyll m<sup>−2</sup> and 15.4 × 10<sup>9</sup> cells m<sup>−2</sup> was measured in May. The species ...
    • Contributions and perspectives of Indigenous Peoples to the study of mercury in the Arctic 

      Lennert, Ann Eileen; Houde, Magali; Krümmel, Eva M.; Mustonen, tero; Brammer, Jeremy; Brown, Tanya M.; Chételat, John; Dahl, Parnuna Egede; Dietz, Rune; Evans, Marlene; Gamberg, Mary; Gauthier, Marie-Josée; Gérin-Lajoie, José; Hauptmann, Aviaja Lyberth; Heath, Joel P.; Henri, Dominique A.; Kirk, Jane; Laird, Brian; Lemire, Mélanie; Letcher, Robert J.; Lord, Sarah; Loseto, Lisa; MacMillan, Gwyneth A.; Mikaelsson, Stefan; Mutter, Edda A.; O'Hara, Todd; Ostertag, Sonja; Robards, Martin; Shadrin, Vyacheslav; Smith, Merran; Stimmelmayr, Raphaela; Sudlovenick, Enooyaq; Swanson, Heidi; Thomas, Philippe J.; Walker, Virginia K.; Whiting, Alex (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-11)
      Arctic Indigenous Peoples are among the most exposed humans when it comes to foodborne mercury (Hg). In response, Hg monitoring and research have been on-going in the circumpolar Arctic since about 1991; this work has been mainly possible through the involvement of Arctic Indigenous Peoples. The present overview was initially conducted in the context of a broader assessment of Hg research organized ...
    • Modelling the effect of submarine iceberg melting on glacier-adjacent water properties 

      Davison, Benjamin Joseph; Cowton, Tom; Sole, Andrew; Cottier, Finlo Robert; Nienow, Pete (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-07)
      The rate of ocean-driven retreat of Greenland’s tidewater glaciers remains highly uncertain in predictions of future sea level rise, in part due to poorly constrained glacier-adjacent water properties. Icebergs and their meltwater contributions are likely important modifiers of fjord water properties, yet their effect is poorly understood. Here, we use a 3-D ocean circulation model, coupled to ...
    • Sustainable management of populations impacted by harvesting and climate change 

      Stenseth, Nils Christian; Ims, Rolf Anker; Sæther, Bernt-Erik; Cadahia, Luis; Herfindal, Ivar; Lee, Aline Magdalena; Whittington, Jason D; Yoccoz, Nigel (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-13)
      The sustainable use of natural resources is critical for addressing the global challenges of today. Strategies for sustainable harvesting need to consider not only harvested species, but also other non-harvested species interacting with them in the same ecosystem. In addition, environmental variation needs to be considered, with climate change currently being one of the main sources of this ...
    • Somatic Dimorphism in Cercariae of a Bird Schistosome 

      Soldánová, Miroslava; Kundid, Petra; Scholz, Tomas; Kristoffersen, Roar; Knudsen, Rune (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-24)
      Phenotypic polymorphism is a commonly observed phenomenon in nature, but extremely rare in free-living stages of parasites. We describe a unique case of somatic polymorphism in conspecific cercariae of the bird schistosome Trichobilharzia sp. “peregra”, in which two morphs, conspicuously different in their size, were released from a single Radix balthica snail. A detailed morphometric analysis ...