Now showing items 1370-1389 of 1891

    • Rabies hos flaggermus. En oversiktsrapport. Revidert utgave av NINA Rapport 76 

      Hansen, Trond Willa; Mørk, Torill; Tryland, Morten; Arnemo, Jon M.; Isaksen, Kjell; van der Kooij, Jeroen; Andersen, Reidar (Research report; Forskningsrapport, 2007-07)
      Rabies hos flaggermus er utbredt over store deler av verden og er også registrert i mange områder i Europa. Fjorten av Europas rundt 40 arter er rapportert å ha vært eksponert for rabiesvirus enten ved påvisning av viruset eller ved funn av antistoffer i blod. Rabiesvirus som forekommer hos flaggermus i Europa kalles European Bat Lyssavirus (EBLV) og finnes i to varianter, EBLV1 og EBLV2 (også kalt ...
    • The radiation exposure of fish in the period of the Techa river peak contamination 

      Shishkina, Elena A.; Pryakhin, Evgeny A.; Sharagin, Pavel A.; Osipov, D.I.; Tryapitsina, Galina A.; Atamanyuk, Natalia I.; Egoreichenkov, E.A.; Trapeznikov, A.V.; Rudolfsen, G.; Teien, H.C.; Sneve, M.K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-10)
      Waterborne radioactive releases into the Techa River from the Mayak Production Association in Russia during 1949–1956 resulted in downstream contamination of the river ecosystem. The discharged liquid waste contained both short-lived isotopes (95Zr, 95Nb, 103,106Ru, 141,144Ce, 91Y, 89Sr and 140Ba with half-life from 3 days to 1.02 years) and the long-lived 90Sr and 137Cs (half-life - 28.79 y and ...
    • Radiolaria and Phaeodaria (siliceous Rhizaria) in south-western and northern Norwegian fjords during late summer 2016: dominant species and biomass in shallow-water assemblages 

      Ikenoue, Takahito; Bjørklund, Kjell Rasmus; Krabberød, Anders Kristian; Nishino, Shigeto; Wassmann, Paul (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-21)
      To determine the present-day community composition of siliceous Rhizaria (Radiolaria and Phaeodaria) in Norwegian fjords, plankton tows were conducted in south-western and northern Norwegian fjords in September 2016. The mean total abundance of radiolarians was 306 m<sup>–3</sup> in the Sognefjord complex, which was the southern research site, and, in the north, 945 m<sup>–3</sup> in Malangen and ...
    • Raising offspring increases ageing: Differences in senescence among three populations of a long-lived seabird, the Atlantic puffin 

      Landsem, Terje Lorentzen; Yoccoz, Nigel Gilles; Layton-Matthews, Kate; Hilde, Christoffer Høyvik; Harris, Michael P; Wanless, Sarah; Daunt, Francis; Reiertsen, Tone Kristin; Erikstad, Kjell E.; Anker-Nilssen, Tycho (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-12)
      1. Actuarial senescence, the decline of survival with age, is well documented in the wild. Rates of senescence vary widely between taxa, to some extent also between sexes, with the fastest life histories showing the highest rates of senescence. Few studies have investigated differences in senescence among populations of the same species, although such variation is expected from population-level ...
    • A range-wide synthesis and timeline for phylogeographic events in the red fox (Vulpes vulpes) 

      Kutschera, Verena E.; Lecomte, Nicolas; Janke, Axel; Selva, Nuria; Sokolov, Alexander A.; Haun, Timm; Steyer, Katharina; Nowak, Carsten; Hailer, Frank (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Many boreo-temperate mammals have a Pleistocene fossil record throughout Eurasia and North America, but only few have a contemporary distribution that spans this large area. Examples of Holarctic-distributed carnivores are the brown bear, grey wolf, and red fox, all three ecological generalists with large dispersal capacity and a high adaptive flexibility. While the two former have been examined ...
    • Rangifer management controls a climate-sensitive tundra state transition 

      Bråthen, Kari Anne; Ravolainen, Virve Tuulia; Stien, Audun; Tveraa, Torkild; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-04)
      Rangifer (caribou/reindeer) management has been suggested to mitigate the temperature- driven transition of Arctic tundra into a shrubland state, yet how this happens is uncertain. Here we study this much focused ecosystem state transition in riparian areas, where palatable willows (Salix) are dominant tall shrubs and highly responsive to climate change. For the state transition to take place, ...
    • The Rapid Expansion of the Jumping Snail Ovachlamys fulgens in Brazil 

      Rosa, Rafael masson; Salvador, Rodrigo Brincalepe; Teixeira, Larissa; Bornschein, Marcos ricardo; Cavallari, Daniel caracanhas (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-29)
      The exotic Japanese jumping snail, Ovachlamys fulgens, was first recorded in Santa Catarina state, Brazil, in 2013. Based on data gathered from the literature, natural history collections, field samplings, and the iNaturalist platform, we assess its current distribution in the country. Our data show that the jumping snail has had a dramatic range expansion since its introduction, reaching six ...
    • Rapid microbial responses to temperature changes in Arctic anoxic peat soil 

      Bjørdal, Yngvild (Master thesis; Mastergradsoppgave, 2021-05-18)
      Arctic peatlands act as important sources and sinks of carbon. Microbial decomposition takes place in these soils, producing the greenhouse gasses carbon dioxide and methane as end-products. A variety of aerobic and anaerobic microbial pathways are involved in the decomposition of organic material in peat soil. In anoxic soil layers, methane and carbon dioxide is often produced through syntropic ...
    • A rapid preparation procedure for laser microdissection‑mediated harvest of plant tissues for gene expression analysis 

      Olsen, Stian; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-02)
      <p><i>Background - </i>Gene expression changes that govern essential biological processes can occur at the cell-specific level. To gain insight into such events, laser microdissection is applied to cut out specific cells or tissues from which RNA for gene expression analysis is isolated. However, the preparation of plant tissue sections for laser microdissection and subsequent RNA isolation usually ...
    • The rapid spread of the girdled snail Hygromia cinctella in New Zealand (Gastropoda: Helicoidea) 

      Salvador, Rodrigo Brincalepe; Ravalo, Lorenzo G. O.; Tennyson, Alan J. D. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022)
      The girdled snail Hygromia cinctella originates from southern Europe but has been introduced to countries in northern Europe and, more recently, to Aotearoa New Zealand. In the latter country, the girdled snail was first noted in 2015 in Wellington, but it has since spread to other regions of the North Island. We report here the rapid spread of this exotic species in New Zealand and record its ...
    • Rapid, landscape scale responses in riparian tundra vegetation to exclusion of small and large mammalian herbivores 

      Ravolainen, Virve; Bråthen, Kari Anne; Ims, Rolf Anker; Yoccoz, Nigel; Henden, John-André; Killengreen, Siw Turid (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      Productive tundra plant communities composed of a variety of fast growing herbaceous and woody plants are likely to attract mammalian herbivores. Such vegetation is likely to respond to different-sized herbivores more rapidly than currently acknowledged from the tundra. Accentuated by currently changing populations of arctic mammals there is a need to understand impacts of different-sized herbivores ...
    • A raster version of the Circumpolar Arctic Vegetation Map (CAVM) 

      Raynolds, Martha K.; Walker, Donald A.; Balser, Andrew; Bay, Christian; Campbell, Mitch; Cherosov, Mikhail M.; Daniëls, Fred J.A.; Eidesen, Pernille Bronken; Ermokhina, Ksenia A.; Frost, Gerald V.; Jedrzejek, Birgit; Jorgenson, M. Torre; Kennedy, Blair E.; Kholod, Sergei S.; Lavrinenko, Igor A.; Lavrinenko, Olga V.; Magnússon, Borgþór; Matveyeva, Nadezhda V.; Metúsalemsson, Sigmar; Nilsen, Lennart; Olthof, Ian; Pospelov, Igor N.; Pospelova, Elena B.; Pouliot, Darren; Razzhivin, Vladimir; Schaepman-Strub, Gabriela; Šibík, Jozef; Telyatnikov, Mikhail Yu.; Troeva, Elena (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-17)
      Land cover maps are the basic data layer required for understanding and modeling ecological patterns and processes. The Circumpolar Arctic Vegetation Map (CAVM), produced in 2003, has been widely used as a base map for studies in the arctic tundra biome. However, the relatively coarse resolution and vector format of the map were not compatible with many other data sets. We present a new version of ...
    • Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida 

      de Carle, Danielle Božena; Gajda, Lukasz; Bielecki, Aleksander; Cios, Stanisław; Cichocka, Joanna M; Golden, Heidi E; Gryska, Andrew D; Sokolov, Sergey; Shedko, Marina Borisowna; Knudsen, Rune; Utevsky, Serge; Świątek, Piotr; Tessler, Michael (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-16)
      Acanthobdellida gnaw into the sides of salmonid fishes in frigid Arctic lakes and rivers, latching on with fearsome facial hooks. Sister to leeches, they are an ancient lineage with two described species. Unfortunately, Acanthobdellida are rarely collected, leading to a paucity of literature despite their unique morphology. Populations range from Eurasia to Alaska (USA), but few specimens of ...
    • Recent oceanic changes in the Arctic in the context of long-term observations 

      Polyakov, Igor V; Bhatt, Uma; Walsh, John E.; Abrahamsen, Einar Povl; Pnyushkov, A.V.; Wassmann, Paul (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      This synthesis study assesses recent changes of Arctic Ocean physical parameters using a unique collection of observations from the 2000s and places them in the context of long-term climate trends and variability. Our analysis demonstrates that the 2000s were an exceptional decade with extraordinary upper Arctic Ocean freshening and intermediate Atlantic water warming. We note that the Arctic ...
    • Recent Salmon Declines : A Result of Lost Feeding Opportunities Due to Bad Timing? 

      Ewart, David; Chittenden, Cedar Marget; Jensen, Jenny Lovisa Alexandra; Anderson, Shannon; Balfry, Shannon; Downey, Elan; Eaves, Alexandra; Saksida, Sonja; Smith, Brian; Vincent, Stephen; Welch, David; McKinley, Scott (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)
    • Recognition of candidate transcription factors related to bilberry fruit ripening by de novo transcriptome and qRT-PCR analyses 

      Nguyen, Nga; Suokas, Marko; Karppinen, Katja; Vuosku, Jaana; Jaakola, Laura; Häggman, Hely (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-02)
      Bilberry (<i>Vaccinium myrtillus</i> L.) fruits are an excellent natural resource for human diet because of their special flavor, taste and nutritional value as well as medical properties. Bilberries are recognized for their high anthocyanin content and many of the genes involved in the anthocyanin biosynthesis have been characterized. So far, neither genomic nor RNA-seq data have been available for ...
    • Recolonization and succession of a subtidal hard-bottom epibenthic community in Smeerenburgfjorden, NW Svalbard. 

      Keck, Amalia (Master thesis; Mastergradsoppgave, 2018-05-15)
      Rapid changes to the physical environment of Arctic marine systems in recent years impact the structure and function of benthic ecosystems. Exploring the resilience of these systems to perturbations requires a solid understanding of key ecological processes and must be conducted over appropriate time scales due to the slow growth and recruitment of many Arctic benthic organisms. This study addresses ...
    • Recovery potential of Arctic wetland tundra on Svalbard. Long-term impacts of grazing by barnacle geese (Branta leucopsis) within the context of climate change 

      Paquin, Karolina (Master thesis; Mastergradsoppgave, 2014-05-19)
      The substantial increase of the migratory Svalbard population of Barnacle geese Branta leucopsis during the past 50 years has been attributed to a warming climate, changes in agricultural land use, and conservation measures. The geese are likely to continue to forage and reproduce in Arctic wetlands in increasing numbers. This project revisited the experimental plots from an earlier experiment ...
    • Recreational fisheries target declining populations of brown trout (Salmo trutta L.) in Northern Norway as revealed by a genome wide array of SNP markers 

      Schmidt, Simon Nordblad (Master thesis; Mastergradsoppgave, 2019-11-15)
      Marine recreational and commercial exploitation of salmonids often target a mixed stock consisting of genetically distinct and independent populations with varying abundances, life histories, standing genetic variation, and conservation status. In this study we use SNP markers to investigate the genetic population structure of juvenile brown trout (Salmo trutta L.) from five distinct watercourses ...
    • Recruitment of benthic invertebrates in high Arctic fjords: Relation to temperature, depth, and season 

      Meyer, Kirstin S.; Sweetman, Andrew K; Kuklinski, Piotr; Leopold, Peter; Vogedes, Daniel Ludwig; Berge, Jørgen; Griffith, Colin; Young, Craig M; Renaud, Paul (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-30)
      In the high Arctic, recruitment of hard-bottom benthic organisms has been studied at single locations, but little is known about how it varies spatially or temporally, or how it is influenced by abiotic factors. In this study, settlement plates were simultaneously deployed at five locations in three Svalbard (Norway) fjords at depths ranging from 7 m to 215 m. Recruitment was significantly different ...