Viser treff 673-692 av 1506

    • Ice-algal carbon supports harp and ringed seal diets in the European Arctic: evidence from fatty acid and stable isotope markers 

      Kunisch, Erin; Graeve, Martin; Gradinger, Rolf; Haug, Tore; Kovacs, Kit M.; Lydersen, Christian; Varpe, Øystein Heggernes; Bluhm, Bodil (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-30)
      Sea-ice declines in the European Arctic have led to substantial changes in marine food webs. To better understand the biological implications of these changes, we quantified the contributions of ice-associated and pelagic carbon sources to the diets of Arctic harp and ringed seals using compound-specific stable isotope ratios of fatty acids in specific primary producer biomarkers derived from sea-ice ...
    • Ice-Associated Amphipods in a Pan-Arctic Scenario of Declining Sea Ice 

      Hop, Haakon; Vihtakari, Mikko; Bluhm, Bodil; Daase, Malin; Gradinger, Rolf; Melnikov, Igor A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-13)
      Sea-ice macrofauna includes ice amphipods and benthic amphipods, as well as mysids. Amphipods are important components of the sympagic food web, which is fuelled by the production of ice algae. Data on the diversity of sea-ice biota have been collected as a part of scientific expeditions over decades, and here we present a pan-Arctic analysis of data on ice-associated amphipods and mysids assimilated ...
    • An ice-tethered buoy for fish and plankton research 

      Zolich, Artur Piotr; De La Torre, Pedro R.; Rodwell, Shane; Geoffroy, Maxime; Johnsen, Geir; Berge, Jørgen (Journal article; Tidsskriftartikkel, 2019-01-10)
      In this paper the authors present bio-acoustical icetethered platform for optical, physical and ecological sensors (POPE), i.e. an ice-tethered buoy, equipped with an AZFP scientific echosounder for fish and plankton research under the ice in the Arctic. The POPE enables remote transfer of large volume of environmental information using flying vehicles as data-mules. The presented prototype has been ...
    • Identification and characterisation of novel SNP markers in Atlantic cod: evidence for directional selection 

      Fevolden, Svein-Erik; Moen, Thomas; Hayes, Ben; Nilsen, Frank; Delghandi, Madjid; Fjalestad, Kjersti; Berg, Paul R.; Lien, Sigbjørn (Journal article; Tidsskriftartikkel; Peer reviewed, 2008-02-26)
      Background: The Atlantic cod (Gadus morhua) is a groundfish of great economic value in fisheries and an emerging species in aquaculture. Genetic markers are needed to identify wild stocks in order to ensure sustainable management, and for marker-assisted selection and pedigree determination in aquaculture. Here, we report on the development and evaluation of a large number of Single Nucleotide ...
    • Identification and Evaluation of 21 Novel Microsatellite Markers from the Autumnal Moth (Epirrita autumnata) (Lepidoptera: Geometridae) 

      Aarnes, Siv Grethe; Fløystad, Ida; Schregel, Julia; Vindstad, Ole Petter L.; Jepsen, Jane Uhd; Eiken, Hans Geir; Ims, Rolf Anker; Hagen, Snorre (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09-17)
      The autumnal moth (Epirrita autumnata) is a cyclically outbreaking forest Lepidoptera with circumpolar distribution and substantial impact on Northern ecosystems. We have isolated 21 microsatellites from the species to facilitate population genetic studies of population cycles, outbreaks, and crashes. First, PCR primers and PCR conditions were developed to amplify 19 trinucleotide loci and two ...
    • Identification of evolutionary and kinetic drivers of NAD-dependent signaling 

      Bockwoldt, Mathias; Houry, Dorothee; Niere, Marc; Gossmann, Toni I.; Reinartz, Ines; Schug, Alexander; Ziegler, Mathias; Heiland, Ines (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-24)
      Nicotinamide adenine dinucleotide (NAD) is best known as an essential cofactor of biochemical reactions. In addition, it is involved in the regulation of virtually all major cellular events. These NAD-dependent regulatory functions are mediated by enzymes (e.g., sirtuins, poly–adenosine -diphosphate [ADP] ribose polymerases, ADP-ribosyl cyclases) that cleave the molecule to liberate nicotinamide ...
    • Identifying climate-sensitive infectious diseases in animals and humans in Northern regions 

      Omazic, Anna; Bylund, Helena; Boqvist, Sofia; Hogberg, Anne-Marie; Björkman, Camilla; Tryland, Morten; Evengård, Birgitta; Koch, Anders; Berggren, C.; Malogolovkin, A; Kolbasov, D; Pavelko, N; Thierfelder, Tomas; Albihn, Ann (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-14)
      <i>Background</i> - General knowledge on climate change effects and adaptation strategies has increased significantly in recent years. However, there is still a substantial information gap regarding the influence of climate change on infectious diseases and how these diseases should be identified. From a One Health perspective, zoonotic infections are of particular concern. The climate in Northern ...
    • Identifying key needs for the integration of social-ecological outcomes in arctic wildlife monitoring 

      Wheeler, Helen Claire; Berteaux, Dominique; Furgal, Chris; Cazelles, Kevin; Yoccoz, Nigel Gilles; Grémillet, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-24)
      For effective monitoring in social–ecological systems to meet needs for biodiversity, science, and humans, desired outcomes must be clearly defined and routes from direct to derived outcomes understood. The Arctic is undergoing rapid climatic, ecological, social, and economic changes and requires effective wildlife monitoring to meet diverse stakeholder needs. To identify stakeholder priorities ...
    • Identifying seasonal distribution patterns of fin whales across the Scotia Sea and the Antarctic Peninsula region using a novel approach combining habitat suitability models and ensemble learning methods 

      Viquerat, Sacha; Waluda, Claire M.; Kennedy, Amy S.; Jackson, Jennifer A.; Hevia, Marta; Carroll, Emma L.; Buss, Danielle L.; Burkhardt, Elke; Thain, Scott; Smith, Patrick; Secchi, Eduardo R.; Santora, Jarrod A.; Reiss, Christian; Lindstrøm, Ulf Ove; Krafft, Bjørn Arne; Gittins, George; Dalla Rosa, Luciano; Biuw, Martin; Herr, Helena (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-16)
      Following their near extirpation by industrial whaling of the 20th century, the population status of Southern Hemisphere fin whales (SHFW) remains unknown. Systematic surveys estimating fin whale abundance in the Southern Ocean are not yet available. Records of fin whale sightings have been collected by a variety of organisations over the past few decades, incorporating both opportunistic data and ...
    • 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 ...
    • Idiosyncratic responses of High Arctic plants to changing snow regimes 

      Rumpf, Sabine Bettina; Semenchuk, Philipp; Dullinger, Stefan; Cooper, Elisabeth J. (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
    • Immobilization of muskoxen (Ovibos moschatus) with etorphine and xylazine 

      Blix, Arnoldus S; Lian, Hans; Ness, john (Journal article; Tidsskriftartikkel; Peer reviewed, 2011-06-27)
      One hundred and thirty three “wild” muskoxen, 81 of which of known body mass, were successfully immobilized using etorphine (M99), and xylazine (Rompun®), delivered by use of a dart gun. A dose of 0.05 mg/kg M99, supplemented by 0.15 mg/kg Rompun was found to be very effective. This dose is much higher than currently recommended e.g. by Handbook of Wildlife Chemical Immobilization.
    • Immunologic Profiling of the Atlantic Salmon Gill by Single Nuclei Transcriptomics 

      West, Alexander Christopher; Mizoro, Yasutaka; Wood, Shona; Ince, Louise M.; Iversen, Marianne; Jørgensen, Even Hjalmar; Nome, Torfinn; Sandve, Simen Rød; Martin, Samuel A. M.; Loudon, Andrew S. I.; Hazlerigg, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-04)
      Anadromous salmonids begin life adapted to the freshwater environments of their natal streams before a developmental transition, known as smoltification, transforms them into marine-adapted fish. In the wild, smoltification is a photoperiod-regulated process, involving radical remodeling of gill function to cope with the profound osmotic and immunological challenges of seawater (SW) migration. While ...
    • Immunological response to Brucella abortus strain 19 vaccination of cattle in a communal area in South Africa 

      Simpson, Gregory; Marcotty, Tanguy; Rouille, Elodie; Chilundo, Abel; Letteson, Jean-Jacques; Godfroid, Jacques (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-29)
      Brucellosis is of worldwide economic and public health importance. Heifer vaccination with live attenuated <i>Brucella abortus</i> strain 19 (S19) is the cornerstone of control in low- and middle-income countries. Antibody persistence induced by S19 is directly correlated with the number of colony-forming units (CFU) per dose. There are two vaccination methods: a ‘high’ dose (5–8 × 10<sup>10</sup> ...
    • Impact of a Dinophysis acuminata Bloom on the Copepod Acartia clausi: First Indications 

      Frangoulis, Constantin; Christou, Epaminondas D.; Varkitzi, Ioanna; Zervoudaki, Soultana; Maneiro, Isabel; Svensen, Camilla; Pagou, Kalliopi; Assimakopoulou, Georgia; Hatzianestis, Ioannis; Granéli, Edna (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-12)
      Faecal pellet production and content along with egg production of the dominant copepod species Acartia clausi were studied in the Thermaikos Gulf (NW Aegean Sea) during a prebloom and a bloom of the toxic dinoflagellate Dinophysis acuminata. Both faecal pellet production (6.8–8.6 ind<sup>−1</sup> d <sup>−1</sup> ) and egg production (15.8–47.6 ind<sup>−1</sup> d <sup>−1</sup> ) appeared unrelated ...
    • The impact of climate sensitive factors on the exposure to organohalogenated contaminants in an aquatic bird exploiting both marine and freshwater habitats 

      Bustnes, Jan Ove; Bårdsen, Bård-Jørgen; Herzke, Dorte; Bangjord, Georg; Bollinger, Eric; Bourgeon, Sophie; Schulz, Ralf; Fritsch, Clémentine; Eulaers, Igor (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-27)
      To assess how climate-sensitive factors may affect the exposure to organochlorines (OCs) and perfluoroalkyl substances (PFASs), we monitored concentrations in eggs of the common goldeneye (<i>Bucephala clangula</i>) over two decades (1999–2019) in central Norway. The goldeneye alternates between marine and freshwater habitats and is sensitive to climate variation, especially due to alterations in ...
    • Impact of climatic change on alpine ecosystems: inference and prediction 

      Yoccoz, Nigel; Delestrade, Anne; Loison, Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2011-01-26)
      Alpine ecosystems will be greatly impacted by climatic change, but other factors, such as land use and invasive species, are likely to play an important role too. Climate can influence ecosystems at several levels. We describe some of them, stressing methodological approaches and available data. Climate can modify species phenology, such as flowering date of plants and hatching date in insects. It ...
    • Impact of local empowerment on conservation practices in a highly developed country 

      Engen, Sigrid; Hausner, Vera Helene (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-17)
      Community-based conservation, where local decision makers are responsible for balancing conservation and development, is often preferred to exclusion- ary conservation that prioritizes use-limitation through strict regulation. Un- raveling the evidence for conservation impact of different governance regimes is challenging. Focusing on conservation practices before and after a reform can provide ...
    • 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, ...