Viser treff 476-495 av 1513

    • Facilitation mediates species presence beyond their environmental optimum 

      O'Brien, Michael J; de Menezes, Luis Fernando Tavares; Bråthen, Kari Anne; Losapio, Gianalberto; Pugnaire, Francisco I. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-01)
      Species distributions are driven by abiotic conditions that filter species with specific traits and physiological tolerances and match them with their suitable environment. Plant–plant interactions can constrict (through competition) or loosen (through facilitation) the strength of these environmental filters, which in turn inhibit or enhance establishment and recruitment of plant species at a finer ...
    • Failure of two consecutive annual treatments with ivermectin to eradicate the reindeer parasites (Hypoderma tarandi, Cephenemyia trompe and Linguatula arctica) from an island in northern Norway. 

      Nilssen, Arne C.; Hemmingsen, Willy; Haugerud, Rolf E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2002)
      The highly efficient endectocide ivermectin is used to reduce the burden of parasites in many semidomestic reindeer herds in northern Fennoscandia. In the autumn of 1995 and 1996 all reindeer on the island of Silda (42 km2) were treated with ivermectin in an attempt to eradicate the warble fly (Hypoderma (=Oedemagena) tarandi (L.)), the nose bot fly (Cephenemyia trompe (Modeer)) (Diptera: Oestridae) ...
    • Fangst av kråkeboller med feller ved Hjelmsøy i Finnmark 

      Sivertsen, Knut (Research report; Forskningsrapport, 2004)
    • Fangstrater, oppvandring og fordeling av laks i Altaelva 

      Jensen, Jenny; Rikardsen, Audun H.; Næsje, Tor F.; Thorstad, Eva B.; Halttunen, Elina; Suhr, Amund; Leinan, Ivar (Research report; Forskningsrapport, 2010-06)
      Bakgrunn og formål Gjennom internasjonale avtaler har Norge forpliktet seg til å forvalte den atlantiske laksen i henhold til føre-var tilnærmingen, slik at bestandene ikke reduseres til et nivå hvor rekrutteringen avtar i betydelig grad. For å forvalte laksestammer og vurdere om de har nådd sine gytebestandsmål er det blant annet behov for kunnskap om fangstrater og bestandsstørrelser, noe som ...
    • Farming cod: Putting the pressure on, and turning up the heat? 

      Peruzzi, Stefano; Jobling, Malcolm (Journal article; Tidsskriftartikkel, 2010)
    • Fat storage influences fasting endurance more than body size in an ungulate 

      Trondrud, Liv Monica; Pigeon, Gabriel; Król, Elżbieta; Albon, Steve; Evans, Alina; Arnold, Walter; Hambly, Catherine; Irvine, R. Justin; Ropstad, Erik; Stien, Audun; Veiberg, Vebjørn; Speakman, John R.; Loe, Leif Egil (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-26)
      <ol> <li>The fasting endurance hypothesis (FEH) predicts strong selection for large body size in mammals living in environments where food supply is interrupted over prolonged periods of time. The Arctic is a highly seasonal and food restricted environment, but contrary to predictions from the FEH, empirical evidence shows that Arctic mammals are often smaller than their temperate conspecifics. ...
    • Fauna crime: elucidating the potential source and introduction history of European smelt (Osmerus eperlanus L.) into Lake Storsjøen, Norway 

      Hagenlund, Mari; Østbye, Kjartan; Langdal, Kjell; Hassve, Marius Hagen; Pettersen, Ruben Alexander; Anderson, Eric; Gregersen, Finn; Præbel, Kim (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05-01)
      The ability to accurately determine the original source of invading species offers several powerful applications in invasive species ecology and management and may enable important information on the invading species in its native habitat. Lake Storsjøen in South-Central Norway was recently found to have been subjected to an illegal translocation of the European smelt (Osmerus eperlanus). The ...
    • Feasibility of active handheld NDVI sensors for monitoring of lichen ground cover 

      Erlandsson, Rasmus; Arneberg, Marit Klemetsen; Tømmervik, Hans; Finne, Eirik Aasmo; Nilsen, Lennart; Bjerke, Jarle W. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-04)
      Vegetation indices are corner stones in vegetation monitoring. However, previous field studies on lichens and NDVI have been based on passive sensors. Active handheld sensors, with their own light sources, enables high- precision monitoring under variable ambient conditions. We investigated the use of handheld sensor NDVI for monitoring pale lichen cover across three study sites from boreal heathlands ...
    • Feeding at the front line: Interannual variation in the use of glacier fronts by foraging black-legged kittiwakes 

      Bertrand, Philip; Strøm, Hallvard; Bêty, Joël; Steen, Harald; Kohler, Jack; Vihtakari, Mikko; Van Pelt, Ward; Yoccoz, Nigel Gilles; Hop, Haakon; Harris, Stephanie M.; Patrick, Samantha C.; Assmy, Philipp; Wold, Anette; Duarte, Pedro; Moholdt, Geir; Descamps, Sébastien (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-28)
      Tidewater glacier fronts can represent important foraging areas for Arctic predators. Their ecological importance is likely to change in a warmer Arctic. Their profitability and use by consumers are expected to vary in time, but the underlying mechanisms driving such variation remain poorly known. The subglacial plume, originating from meltwater discharge, is responsible for the entrainment and ...
    • Feeding studies take guts - critical review and recommendations of methods for stomach contents analysis in fish 

      Amundsen, Per-Arne; Sanchez-Hernandez, Javier (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-07)
      Studies on the feeding ecology of fish are essential for exploring and contrasting trophic interactions and population and community dynamics within and among aquatic ecosystems. In this respect, many different methods have been adopted for the analysis of fish stomach contents. No consensus has, however, been reached for a standardised methodology despite that for several decades there has been an ...
    • Fifteen research needs for understanding climate change impacts on ecosystems and society in the Norwegian High North 

      Kebir, Zina Asnah; Chambers, Catherine; Frainer, André; Hausner, Vera Helene; Lennert, Ann Eileen; Lento, Jennifer; Poste, Amanda; Ravolainen, Virve; Renner, Angelika; Thomas, David N.; Waylen, Kerry (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-07)
      There is an urgent need to understand and address the risks associated with a warming climate for ecosystems and societies in the Arctic and sub-Arctic regions. There are major gaps in our understanding of the complex effects of climate change—including extreme events, cascading impacts across ecosystems, and the underlying socioecological dynamics and feedbacks—all of which need collaborative efforts ...
    • Finding CreativeVoice: Applying Arts-based Research in the Context of Biodiversity Conservation 

      López, Flor Rivera; Wickson, Fern; Hausner, Vera Helene (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-29)
      The integration of creative arts–based methods into scientific research offers a host of advantages, including the ability to capture the complex texture of lived experience, explore interconnections between nature and culture, support nonhierarchical relations, and communicate insights in engaging and empowering new ways. In this article, we describe a new method—CreativeVoice—integrating the ...
    • Finding the needle in the haystack: Comparison of methods for salmon louse enumeration in plankton samples 

      Bui, Samantha; Dalvin, Sussie; Vågseth, Tone; Oppedal, Frode; Fossøy, Frode; Brandsegg, Hege; Jacobsen, Ása; Nordi, Gunnvør á; Fordyce, Mark; Michelsen, Helena Kling; Finstad, Bengt; Skern-Mauritzen, Rasmus (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-07)
      The economic and social implications of salmon louse (Lepeophtheirus salmonis) epidemics in salmon aquaculture drive focus of the dispersal dynamics of the planktonic larval stages. The vast spatial scale and high connectivity of the marine environment creates difficult conditions to monitor the infective planktonic louse stage, whereby the number of samples required for a representative description ...
    • First analysis of an Arctic sea ice meiofauna food web based on abundance, biomass and stable isotope ratios 

      Gradinger, Rolf; Bluhm, Bodil (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-23)
      Particulate organic carbon (POC) produced in sea ice is often included in stable isotopic food web studies of polar seas as a single value of particulate organic matter (POM), i.e. ‘ice POM’. During 10 field trips to landfast ice off Alaska’s north coast, we examined the seasonal contribution of sea ice-associated meiofauna to total POM and the trophic structure within the sea ice using bulk carbon ...
    • First documentation of plastic ingestion in the arctic glaucous gull (Larus hyperboreus) 

      Benjaminsen, Stine Charlotte; Bourgeon, Sophie; Herzke, Dorte; Ask, Amalie; Collard, France; Gabrielsen, Geir Wing (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-20)
      Arctic wildlife is facing multiple stressors, including increasing plastic pollution. Seabirds are intrinsic to marine ecosystems, but most seabird populations are declining. We lack knowledge on plastic ingestion in many arctic seabird species, and there is an urgent need for more information to enable risk assessment and monitoring. Our study aimed to investigate the occurrence of plastics in ...
    • A first fecundity study of the female snow crab Chionoecetes opilio Fabricius, 1788 (Decapoda: Brachyura: Oregoniidae) of the newly established population in the Barents Sea 

      Danielsen, Hanna Ellerine Helle; Hjelset, Ann Merete; Bluhm, Bodil; Hvingel, Carsten; Agnalt, Ann-Lisbeth (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-11)
      The snow crab <i>Chionoecetes opilio</i> Fabricius, 1788 is a newly established species in the Barents Sea. Since the first individuals were recorded in 1996, the population has increased and a fishery was initiated in 2012. Mature female snow crab caught in the central Barents Sea were investigated with regards to fecundity. Ovigerous females (<i>N</i> = 185) ranged from 48 to 100 mm carapace width ...
    • A first insight into the fecal microbiota of the high Arctic muskoxen (Ovibos moschatus) 

      Salgado, Alejandro Flores; Bockwoldt, Mathias; Hagen, Live Heldal; Pope, Phillip; Sundset, Monica Alterskjær (Journal article; Tidsskriftartikkel, 2016-07-11)
      The faecal microbiota of muskoxen (n=3) pasturing on Ryøya (69° 33′ N 18° 43′ E), Norway, in late September was characterized using high-throughput sequencing of partial 16S rRNA gene regions. A total of 16 209 high-quality sequence reads from bacterial domains and 19 462 from archaea were generated. Preliminary taxonomic classifications of 806 bacterial operational taxonomic units (OTUs) resulted ...
    • First isolation, identification, phenotypic and genotypic characterization of Brucella abortus biovar 3 from dairy cattle in Tanzania 

      Mtenga, Coletha Mathew; Stokstad, Maria; Johansen, Tone Kristin Bjordal; Klevar, Siv; Mdgela, Robinson H.; Mwamengele, G.L.; Michel, P; Escobar, L.; Fretin, D.; Godfroid, Jacques (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-07-21)
      Background: Brucellosis is a disease of worldwide public health and economic importance. Successful control is based on knowledge of epidemiology and strains present in an area. In developing countries, most investigations are based on serological assays. This study aimed at investigating a dairy herd experiencing abortions in order to establish within-herd seroprevalence to Brucella spp., identify, ...
    • First record of a rare species, Polyasterias problematica (Prasinophyceae), in Balsfjord, northern Norway 

      Kubiszyn, Anna M; Svensen, Camilla (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-13)
      <i>Polyasterias problematica</i> is a poorly investigated prasinophyte species, practically known only from a few, primarily historical studies. Fragmentary information on the species indicates that <i>P. problematica</i> is mainly distributed in the euphotic zone of the Canadian and Russian Arctic, Atlantic Canada, the mid-Atlantic and some European seas. Here, we present the first record of this ...
    • First record of cuticle bands in the stomach ossicles of the red king crab Paralithodes camtschaticus (Tilesius, 1815) (Decapoda: Anomura: Lithodidae) from Norway. 

      Bluhm, Bodil; Kilada, Raouf; Ambrose, William; Renaud, Paul Eric; Sundet, Jan Henry (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-09)
      The red king crab Paralithodes camtschaticus (Tilesius, 1815) is a large predator intentionally introduced to the Barents Sea and adjacent fjords in the 1960s. Its establishment has given rise to both a high-value fishery and destructive effects on seafloor habitats and communities. Given the need for accurate information on age, growth, and longevity that could improve management and mitigation ...