Now showing items 861-880 of 1630

    • RNA profiling identifies novel, photoperiodhistory dependent markers associated with enhanced saltwater performance in juvenile Atlantic salmon 

      Iversen, Marianne; Mulugeta, Teshome Dagne; Blikeng, Børge Gellein; West, Alexander Christopher; Jørgensen, Even Hjalmar; Sandve, Simen Rød; Hazlerigg, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-08)
      Atlantic salmon migrate to sea following completion of a developmental process known as smolting, which establishes a seawater (SW) tolerant phenotype. Smolting is stimulated by exposure to long photoperiod or continuous light (LL) following a period of exposure to short photoperiod (SP), and this leads to major changes in gill ion exchange and osmoregulatory function. Here, we performed an RNAseq ...
    • Storm-driven across-shelf oceanic flows into coastal waters 

      Jones, Sam; Inall, Mark; Porter, Marie; Graham, Jennifer A.; Cottier, Finlo Robert (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-02)
      The North Atlantic Ocean and northwest European shelf experience intense low-pressure systems during the winter months. The effect of strong winds on shelf circulation and water properties is poorly understood as observations during these episodes are rare, and key flow pathways have been poorly resolved by models up to now. We compare the behaviour of a cross-shelf current in a quiescent period in ...
    • Soil chemistry changes beneath decomposing cadavers over a one-year period 

      Szelecz, Ildiko; Koenig, Isabelle; Seppey, Christophe Victor W.; Le Bayon, Renee-Claire; Mitchell, Edward A.D. (Journal article; Tidsskriftartikkel, 2018-03-06)
      Decomposing vertebrate cadavers release large, localized inputs of nutrients. These temporally limited resource patches affect nutrient cycling and soil organisms. The impact of decomposing cadavers on soil chemistry is relevant to soil biology, as a natural disturbance, and forensic science, to estimate the postmortem interval. However, cadaver impacts on soils are rarely studied, making it difficult ...
    • Comparison of budburst phenology trends and precision among participants in a citizen science program 

      Bison, M; Yoccoz, Nigel Gilles; Carlson, BZ; Delestrade, Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-01)
      Quantifying shifts in plant phenology in response to climate change represents an ongoing challenge, particularly in mountain ecosystems. Because climate change and phenological responses vary in space and time, we need long-term observations collected at a broad spatial scale. While data collection by volunteers is a promising approach to achieve this goal, one major concern with citizen science ...
    • Alien species in Norway: results from quantitative ecological impact assessments 

      Sandvik, Hanno; Hilmo, Olga; Henriksen, Snorre; Elven, Reidar; Åsen, Per Arvid; Hegre, Hanne; Pedersen, Oddvar; Pedersen, Per Anker; Solstad, Heidi; Vandvik, Vigdis; Westergaard, Kristine Bakke; Ødegaard, Frode; Åström, Sandra Charlotte Helene; Elven, Hallvard; Endrestøl, Anders; Gammelmo, Øivind; Hatteland, Bjørn Arild; Solheim, Halvor; Nordén, Björn; Sundheim, Leif; Talgø, Venche; Falkenhaug, Tone; Gulliksen, Bjørn; Jelmert, Anders; Oug, Eivind; Sundet, Jan Henry; Forsgren, Elisabet; Finstad, Anders Gravbrøt; Hesthagen, Trygve H.; Nedreaas, Kjell Harald; Wienerroither, Rupert; Husa, Vivian; Fredriksen, Stein; Sjøtun, Kjersti; Steen, Henning; Hansen, Haakon; Hamnes, Inger Sofie; Karlsbakk, Egil; Magnusson, Christer; Ytrehus, Bjørnar; Pedersen, Hans Christian; Swenson, Jon; Syvertsen, Per Ole; Stokke, Bård Gunnar; Gjershaug, Jan Ove; Dolmen, Dag; Kjærstad, Gaute; Johnsen, Stein Ivar; Jensen, Thomas Correll; Hassel, Kristian; Gederaas, Lisbeth (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-20)
      1. Due to globalisation, trade and transport, the spread of alien species is increasing dramatically. Some alien species become ecologically harmful by threatening native biota. This can lead to irreversible changes in local biodiversity and ecosystem functioning, and, ultimately, to biotic homogenisation.<p><p> 2. We risk-assessed all alien plants, animals, fungi and algae, within certain ...
    • Sampling planktonic salmon lice in Norwegian fjords 

      Skardhamar, Jofrid; Fagerli, Margrethe Nilsen; Reigstad, Marit; Sandvik, Anne Dagrun; Bjørn, Pål Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-19)
      Risk of mortality of wild salmon caused by salmon lice is used as an index for managing aquaculture production in Norway and is based on monitoring of lice attached to wild salmonids and modelled concentrations of lice larvae in fjords. Direct sampling of lice from Norwegian waters to determine concentrations has never been published scientifically and has been considered non-feasible for monitoring ...
    • 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 (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-11)
      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 Protocol (SFP) involving stakeholders to decide the purpose and structure of a dynamic state-space model for the population dynamics of the Willow Ptarmigan, a popular game species ...
    • Salmon louse (Lepeophtheirus salmonis (Krøyer)) control methods and efficacy in atlantic salmon (Salmo salar (Linnaeus)) aquaculture: A literature review 

      Cerbule, Kristine; Godfroid, Jacques (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-31)
      The salmon louse (<i>Lepeophtheirus salmonis</i>) causes problems in Atlantic salmon (<i>Salmo salar</i>) aquaculture in the Northern Hemisphere, because infestations can result in both a loss of production and in fish mortality. Several types of treatment have been used to control louse infestations, but these have seen varying success. The aim of this review is to examine the efficacy and safety ...
    • Migration and habitat use of the landlocked riverine Atlantic salmon Salmo salar småblank 

      Davidsen, Jan Grimsrud; Eikås, Linda; Hedger, Richard David; Thorstad, Eva Bonsak; Rønning, Lars; Sjursen, Aslak Darre; Berg, Ole Kristian; Bremset, Gunnbjørn; Karlsson, Sten; Sundt-Hansen, Line Elisabeth Breivik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-18)
      “Småblank” is the only population of Atlantic salmon in Europe living its entire life in the river habitat without performing migrations to the sea or lakes. Home range size and habitat use were compared between an unregulated tributary and hydro-power regulated parts of the main river during 2014–2017. In total, 140 småblank were tagged with radio transmitters and tracked for 4–5 months. Tagged ...
    • Populasjonssykluser hos rype – stor variasjon i rom og tid 

      Henden, John-André; Fuglei, Eva; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-27)
      Fjellrype og lirype har en vid sirkumpolar utbredelse, med populasjoner som ofte har store, sykliske svingninger. Disse rypesyklusenes periodelengde og amplitude varierer imidlertid svært mye i tid og rom. Mens norske rypepopulasjoner har hatt en 3–4-års syklus koplet til smågnagersyklusen, kan rype andre steder i verden ha 9–11-års sykluser koplet til andre arter i økosystemet. Rypedynamikken kan ...
    • Quantifying tourism booms and the increasing footprint in the Arctic with social media data 

      Runge, Claire Alice; Remi, Daigle; Hausner, Vera Helene (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-16)
      Arctic tourism has rapidly increased in the past two decades. We used social media data to examine localized tourism booms and quantify the spatial expansion of the Arctic tourism footprint. We extracted geotagged locations from over 800,000 photos on Flickr and mapped these across space and time. We critically examine the use of social media as a data source in data-poor regions, and find that while ...
    • Kesälaidunnus ei ole ylilaidunnusta 

      Oksanen, Lauri (Journal article; Tidsskriftartikkel, 2019)
    • Tunturit, laidunnus ja kukat: näköaloja Jotunheimilta Pohjoiskalotille 

      Oksanen, Lauri (Journal article; Tidsskriftartikkel, 2019)
    • Mapping the Historical Shipwreck Figaro in the High Arctic Using Underwater Sensor-Carrying Robots 

      Mogstad, Aksel Alstad; Ødegård, Øyvind; Nornes, Stein Melvær; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-19)
      In 2007, a possible wreck site was discovered in Trygghamna, Isfjorden, Svalbard by the Norwegian Hydrographic Service. Using (1) a REMUS 100 autonomous underwater vehicle (AUV) equipped with a sidescan sonar (SSS) and (2) a Seabotix LBV 200 mini-remotely operated vehicle (ROV) with a high-definition (HD) camera, the wreck was in 2015 identified as the Figaro: a floating whalery that sank in 1908. ...
    • Advantages and Limitations of Using Mobile Apps for Protected Area Monitoring and Management 

      Muñoz, Lorena; Hausner, Vera Helene; Monz, Christopher (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-18)
      Digital technologies, including participatory Internet mapping, social media and smartphones, provide new avenues for research in outdoor recreation and tourism. The potential to reach a greater audience and collect visitation data on a broader scale, with less costs than traditional paper surveys, are key advantages that have increased the use of these novel technologies. Using of mobile apps for ...
    • Compositional and morphological analyses of wax in northern wild berry species 

      Trivedi, Priyanka; Karppinen, Katja; Klavins, Linards; Kviesis, Jorens; Sundqvist, Petri; Nguyen, Nga; Heinonen, Esa; Klavins, Maris; Jaakola, Laura; Väänänen, Juha; Remes, Janne; Häggman, Hely (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-21)
      Aerial surfaces of plants are covered by a waxy cuticle protecting plants from excessive water loss and UV light. In the present study, composition and morphology of cuticular waxes of northern wild berry species bilberry (<i>Vaccinium myrtillus</i> L.), lingonberry (V. <i>vitis-idaea</i> L.), bog bilberry (V. <i>uliginosum</i> L.) and crowberry (<i>Empetrum nigrum</i> L.) were investigated. Scanning ...
    • The genetic legacy of extreme exploitation in a polar vertebrate 

      Paijmans, Anneke; Stoffel, Martin A.; Bester, Marthán N.; Cleary, Alison Clare; de Bruyn, P.J. Nico; Forcada, Jaume; Goebel, M; Goldsworthy, S.D.; Guinet, Christophe; Lydersen, Christian; Kovacs, Kit M.; Lowther, Andrew; Hoffman, Joseph I. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-20)
      Understanding the effects of human exploitation on the genetic composition of wild populations is important for predicting species persistence and adaptive potential. We therefore investigated the genetic legacy of large-scale commercial harvesting by reconstructing, on a global scale, the recent demographic history of the Antarctic fur seal (Arctocephalus gazella), a species that was hunted to the ...
    • Sami knowledge and ecosystem-based adaptation strategies for managing pastures under threat from multiple land uses 

      Hausner, Vera Helene; Engen, Sigrid; Brattland, Camilla; Fauchald, Per (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-13)
      <ol><li>Ecosystem‐based adaptation (EbA) relies upon the capacity of ecosystems to buffer communities against the adverse impacts of climate change. Maintaining ecosystems that deliver critical services to communities can also provide co‐benefits beyond adaptation, such as climate mitigation and protection of biological diversity and livelihoods. EbA has, to a limited extent, drawn upon indigenous ...
    • Identifying spatial overlap in the values of locals, domestic- and international tourists to protected areas 

      Muñoz, Lorena; Hausner, Vera Helene; Brown, Greg; Runge, Claire Alice; Fauchald, Per (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-22)
      Nature-based tourism is increasingly encouraged to support local socioeconomic development in and around protected areas, but managing protected areas for tourism could challenge existing park uses associated with self-organized outdoor recreation and local resource use. We used a web-based Public Participatory Geographic Information System (PPGIS) to identify the most important places and values ...
    • Marine CO2 system variability in a high arctic tidewater-glacier fjord system, Tempelfjorden, Svalbard 

      Ericson, Ylva; Falck, Eva; Chierici, Melissa; Fransson, Agneta Ingrid; Kristiansen, Svein (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-04)
      The marine CO<sub>2</sub> system in Tempelfjorden (Svalbard) was investigated between August 2015 and December 2017 using total alkalinity, pH, temperature, salinity, oxygen isotopic ratio, and nutrient data. Primary production resulted in the largest changes that were observed in the partial pressure of CO<sub>2</sub> (<i>p</i>CO<sub>2</sub>, 140 μatm) and the saturation state of aragonite ...