Viser treff 821-840 av 1637

    • Aggregate feeding by the copepods Calanus and Pseudocalanus controls carbon flux attenuation in the Arctic shelf sea during the productive period 

      van der Jagt, Helga; Wiedmann, Ingrid; Hildebrandt, Nicole; Niehoff, Barbara; Iversen, Morten H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-24)
      Up to 95% of the oceanic primary production is recycled within the upper few hundred meters of the water column. Marine snow and zooplankton fecal pellets in the upper water column are often recycled at rates exceeding those measured for microbial degradation, suggesting that zooplankton might be important for flux attenuation of particulate organic carbon in the upper ocean. However, direct evidence ...
    • Changes in the Proanthocyanidin Composition and Related Gene Expression in Bilberry (Vaccinium myrtillus L.) Tissues 

      Suvanto, Jussi; Karppinen, Katja; Riihinen, Kaisu; Jaakola, Laura; Salminen, Juha-Pekka (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-16)
      Berries of genus <i>Vaccinium</i> are rich in flavonoids and proanthocyanidins (PAs). We studied the PA composition and biosynthesis in bilberry (<i>Vaccinium myrtillus L.</i>) tissues and during fruit development. Soluble PAs, analyzed by UHPLC–MS/MS, were most abundant in stem and rhizome with the mean PA polymerization level varying between 4 and 6 in all tissues. Both A- and B-type PAs were ...
    • The Bacterial Microbiome in the Small Intestine of Hooded Seals (Cystophora cristata) 

      Acquarone, Mario; Salgado-Flores, Alejandro; Sundset, Monica Alterskjær (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-27)
      Arctic hooded seals (Cystophora cristata) are monogastric carnivores that go through extreme fasting and re-feeding in early life. They are born isolated on sea ice; suckle high-fat milk for four days and may then fast for up to one month before they start hunting and feeding on small prey (fish and crustaceans). Previous studies of the gut microbiota in pinnipeds have focused on the large intestine, ...
    • Temperature-dependent egg production and egg hatching rates of small egg-carrying and broadcast-spawning copepods Oithona similis, Microsetella norvegica and Microcalanus pusillus 

      Barth-Jensen, Coralie; Koski, Marja; Varpe, Øystein; Glad, Peter; Wangensteen, Owen S.; Præbel, Kim; Svensen, Camilla (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-07)
      Reproductive rates of copepods are temperature-dependent, but poorly known for small copepods at low temperatures, hindering the predictions of population dynamics and secondary production in high-latitude ecosystems. We investigated egg hatching rates, hatching success and egg production of the small copepods <i>Oithona similis</i> and <i>Microsetella norvegica</i> (sac spawners) and <i>Microcalanus ...
    • Spatial and temporal trends of mercury in freshwater fish in Fennoscandia (1965-2015) 

      Braaten, Hans Fredrik Veiteberg; Åkerblom, Staffan; de Wit, Heleen; Skotte, Gunnar; Rask, Martti; Vuorenmaa, Jussi; Kahilainen, Kimmo K.; Malinen, Tommi; Rognerud, Sigurd; Lydersen, Espen; Amundsen, Per-Arne; Kashulin, Nicholas; Kashulina, Tatiana; Terentyev, Petr; Christensen, Guttorm; Jackson-Blake, Leah Amber; Lund, Espen; Rosseland, Bjørn Olav (Research report; Forskningsrapport, 2017-09)
      Mercury (Hg) emissions to the atmosphere cause elevated Hg levels in fish, even in many remote regions of the world. Here we present an extensive database of more than 50 000 measurements of Hg in fish, including 2 775 individual water bodies in Fennoscandia (Norway, Sweden, Finland, Russian part of Kola Peninsula) sampled between 1965 and 2015. The data have been analysed for spatial patterns and ...
    • Weakening of Cold Halocline Layer Exposes Sea Ice to Oceanic Heat in the Eastern Arctic Ocean 

      Polyakov, Igor V.; Rippeth, Tom; Fer, Ilker; Alkire, Matthew B.; Carmack, Eddy; Ingvaldsen, Randi Brunvær; Ivanov, Vladimir V.; Janout, Markus; Lind, Sigrid; Padman, Laurie; Pnyushkov, Andrey V.; Rember, Robert (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-20)
      A 15-yr duration record of mooring observations from the eastern (>70°E) Eurasian Basin (EB) of the Arctic Ocean is used to show and quantify the recently increased oceanic heat flux from intermediate-depth (~150–900 m) warm Atlantic Water (AW) to the surface mixed layer and sea ice. The upward release of AW heat is regulated by the stability of the overlying halocline, which we show has weakened ...
    • Antimicrobial resistance due to the use of biocides and heavy metals: a literature review 

      Tronsmo, Arne; Gjøen, Tor; Sørum, Henning; Godfroid, Jacques; Yazdankhah, Siamak Pour; Jelmert, Anders; Klein, Joern; Okoli, Arinze Stanley; Ytrehus, Bjørnar; Skaar, Ida (Research report; Forskningsrapport, 2016-12-09)
      In June 2016,the Norwegian EnvironmentAgencyrequestedthe Norwegian Scientific Committee for Food Safety (VKM) to conducta literature reviewregardingdevelopment of bacterial resistance to biocides and heavy metals and cross-resistance to antimicrobial agents(e.g.,antibiotics)in bacteria, with the following mandate: <br><br>1.List chemical substancesthat may contribute to increased antimicrobial ...
    • CWD in Norway 

      Tranulis, Michael A.; Tryland, Morten; Kapperud, Georg; Skjerve, Eystein; Gudding, Roar; Grahek-Ogden, Danica; Eckner, Karl Fredrich; Lassen, Jørgen Fr; Narvhus, Judith; Nesbakken, Truls; Robertson, Lucy; Rosnes, Jan Thomas; Vold, Line; Yazdankhah, Siamak Pour; Wasteson, Yngvild; Skjerdal, Olaug Taran (Research report; Forskningsrapport, 2016-06-30)
      The Norwegian Food Safety Authority (NFSA) and Norwegian Environmental Authority (NEA) asked the Norwegian Scientific Committee for Food Safety (Vitenskapskomiteen for mattrygghet, VKM) for an opinion on factors associated with the introduction of Chronic Wasting Disease (CWD) to Norway. VKM appointed a working group consisting of two members of the Panel on Biological Hazards, one member of Panel ...
    • Ocular Histopathological Findings in Semi-Domesticated Eurasian Tundra Reindeer (Rangifer tarandus tarandus) with Infectious Keratoconjunctivitis after Experimental Inoculation with Cervid Herpesvirus 2 

      Sanchez Romano, Javier; Sørensen, Karen Kristine; Larsen, Anett Kristin; Mørk, Torill; Tryland, Morten (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-09)
      Infectious keratoconjunctivitis (IKC) is a common transmissible ocular disease in semi-domesticated Eurasian tundra reindeer (<i>Rangifer tarandus tarandus</i>). In large outbreaks, IKC may affect tens of animals in a herd, with the most severe cases often requiring euthanasia due to the destruction of the affected eyes and permanent blindness. An experimental inoculation with cervid herpesvirus 2 ...
    • Life history genomic regions explain differences in Atlantic salmon marine diet specialization 

      Aykanat, Tutku; Rasmussen, Martin; Ozerov, Mikhail; Niemelä, Eero; Paulin, Lars; Vähä, Juha-Pekka; Hindar, Kjetil; Wennevik, Vidar; Pedersen, Torstein; Svenning, Martin; Primmer, Craig R. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-16)
      1. Animals employ various foraging strategies along their ontogeny to acquire energy, and with varying degree of efficiencies, to support growth, maturation and subsequent reproduction events. Individuals that can efficiently acquire energy early are more likely to mature at an earlier age, as a result of faster energy gain which can fuel maturation and reproduction.<p><p> 2. We aimed to test the ...
    • Pan-Arctic analysis of cultural ecosystem services using social media and automated content analysis 

      Runge, Claire Alice; Hausner, Vera Helene; daigle, remi; Monz, Christoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-02)
      In the Arctic, as in many parts of the world, interactions with the natural world are an important part of people's experience and are often recorded in photographs. Emerging methods for automated content analysis of social media data offers opportunities to discover information on cultural ecosystem services from photographs across large samples of people and countries. We analysed over 800 000 ...
    • The Impact of Methane on Microbial Communities at Marine Arctic Gas Hydrate Bearing Sediment 

      Carrier, Vincent; Svenning, Mette Marianne; Gründger, Friederike; Niemann, Helge; Dessandier, Pierre-Antoine; Panieri, Giuliana; Kalenitchenko, Dimitri (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-24)
      Cold seeps are characterized by high biomass, which is supported by the microbial oxidation of the available methane by capable microorganisms. The carbon is subsequently transferred to higher trophic levels. South of Svalbard, five geological mounds shaped by the formation of methane gas hydrates, have been recently located. Methane gas seeping activity has been observed on four of them, ...
    • Research gaps and trends in the Arctic tundra: a topic-modelling approach 

      Ancin Murguzur, Francisco Javier; Hausner, Vera Helene (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-18)
      Climate change is affecting the biodiversity, ecosystem services and the well-being of people that live in the Arctic tundra. Understanding the societal implications and adapting to these changes depend on knowledge produced by multiple disciplines. We analysed peer-reviewed publications to identify the main research themes relating to the Arctic tundra and assessed to what extent current research ...
    • Integrating dispersal along freshwater ecosystems into species distribution models 

      Perrin, Sam Wenaas; Englund, Göran; Blumentrath, Stefan; O'Hara, Robert Brian; Amundsen, Per-Arne; Finstad, Anders Gravbrøt (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-29)
      <i>Aim</i> - Our ability to model species distributions and abundances is a valuable ecological tool in predicting future distributions of species. Effectively incorporating connectivity into these predictions is crucial; however, many connectivity measures utilize metrics which may not have a direct relation to the dispersal capacity of the species they are attempting to model. The identification ...
    • Assessment of risk of introduction of Echinococcus multilocularis to mainland Norway 

      Robertson, Lucy; Tryland, Morten; Davidson, Rebecca K.; Eckner, Karl Fredrich; Kapperud, Georg; Lunestad, Bjørn Tore; Nesbakken, Truls; Nygård, Karin Maria; Tranulis, Michael A.; Yazdankhah, Siamak Pour; Lassen, Jørgen Fr (Research report; Forskningsrapport, 2012-02-15)
      In the light of the recent findings of the tapeworm Echinococcus multilocularis (EM) in four red foxes from three different locations in Sweden, the Norwegian Scientific Committee for Food Safety (Vitenskapskomiteen; VKM), Panel of Biological Hazards (Faggruppe hygiene og smittestoffer) took the initiative to undertake a risk assessment regarding the probability of this parasite being introduced to ...
    • Development of 14 microsatellite markers for zoonotic tapeworm dibothriocephalus dendriticus (Cestoda: Diphyllobothriidea) 

      Bazsalovicsová, Eva; Minárik, Gabriel; Šoltys, Katarína; Radačovská, Alžbeta; Kuhn, Jesper Andreas; Karlsbakk, Egil; Skírnisson, Karl; Králová-Hromadová, Ivica (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-12)
      <i>Dibothriocephalus dendriticus</i> is one of the causative agents of the fish-borne zoonosis diphyllobothriosis. Polymorphic microsatellite markers were originally developed for future genetic studies using microsatellite library screening and next-generation sequencing (NGS). Out of 128 microsatellite candidates selected after NGS analysis, 126 yielded PCR products of the expected size. A declared ...
    • Selection and validation of reliable reference genes for gene expression studies from Monilinia vaccinii-corymbosi infected wild blueberry phenotypes 

      Jose, Sherin; Abbey, Joel; Jaakola, Laura; Percival, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-16)
      Monilinia blight disease caused by <i>Monilinia vaccinii-corymbosi</i> (Reade) Honey (<i>M.vc</i>) causes severe damage and economic losses in wild blueberry growing regions. Molecular mechanisms regulating defence responses of wild blueberry phenotypes towards this causal fungus are not yet fully known. A reliable quantification of gene expression using quantitative real time PCR (qPCR) is fundamental ...
    • Seasonal dynamics of carbonate chemistry, nutrients and CO2 uptake in a sub-Arctic fjord 

      Jones, Elizabeth Marie; Renner, Angelika; Chierici, Melissa; Wiedmann, Ingrid; Lødemel, Helene; Biuw, Martin (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-17)
      Environmental change can have a significant impact on biogeochemical cycles at high latitudes and be particularly important in ecologically valuable fjord ecosystems. Seasonality in biogeochemical cycling in a sub-Arctic fjord of northern Norway (Kaldfjorden) was investigated from October 2016 to September 2018. Monthly changes in total inorganic carbon (C<sub>T</sub>), alkalinity (A<sub>T</sub>), ...
    • Assessment of benefits and risks of probiotics in processed cereal-based baby foods Lactobacillus paracasei ssp. paracasei F19 

      Halvorsen, Ragnhild; Lassen, Jørgen Fr; Midtvedt, Tore; Narvhus, Judith; Rugtveit, Jarle; Yazdankhah, Siamak Pour; Eckner, Karl Fredrich; Frølich, Wenche; Frøyland, Livar; Iversen, Per Ole; Kapperud, Georg; Lillegaard, Inger Therese L.; Lunestad, Bjørn Tore; Lyche, Jan Ludvig; Mansoor, Mohammad Azam; Meltzer, Helle Margrete; Nesbakken, Truls; Nygård, Karin Maria; Robertson, Lucy; Tranulis, Michael A.; Tryland, Morten; Haugen, Margaretha (Research report; Forskningsrapport, 2011-06-23)
      The Norwegian Scientific Committee for Food Safety (VKM) has appointed an ad hoc-group of experts to answer a request from the Norwegian Food Safety Authority regarding benefit and risk assessment of Lactobacillus paracasei ssp. paracasei F19 (F19) in processed cereal-based baby foods intended for small children 1-3 years. This assessment is based on the literature provided by the notifier as well ...
    • Risk assessment on welfare in turkeys. Opinion of the Panel of Animal Health and Welfare of the Norwegian Scientific Committee for Food Safety 

      Hoel, Kristian; Agdestein, Angelika; Bøe, Knut Egil; Hansen, Magne; Janczak, Andrew M.; Bergh, Øivind; Brun, Edgar; Das Neves, Carlos G; Godfroid, Jacques; Gudding, Roar; Mejdell, Cecilie Marie; Mortensen, Stein; Rimstad, Espen; Hjeltnes, Brit (Research report, 2016-02-15)
      The Norwegian Food Safety Authority (NFSA) asked the Norwegian Scientific Committee for Food Safety (Vitenskapskomiteen for mattrygghet, VKM) for a risk assessment on turkey welfare. The VKM report will be used by NFSA in assessing the need for amending the existing regulations, competence requirements, and guidelines for surveillance and control related to keeping turkeys. Inspectors from NFSA ...