Blar i tittel Artikler, rapporter og annet (arktisk og marin biologi)

Viser treff 496-515 av 1515

    • First record of plastic debris in the stomach of a hooded seal pup from the Greenland Sea 

      Pinzone, Marianna; Nordøy, Erling Sverre; Eppe, Gauthier; Malherbe, Cédric; Das, Krishna; Collard, France (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-14)
      Plastic debris is globally found around the world and the remote Arctic is no exception. Arctic true seals are sentinel species of marine pollution and represent the link between marine food webs and Arctic apex predators like polar bears and humans. With regard to true seals, ingested macroplastics have never been reported in an Arctic species. We harvested 10 harp seals Pagophilus groenlandicus ...

    • First records of Atlantic mackerel (Scomber scombrus) from the Svalbard archipelago, Norway, with possible explanations for the extension of its distribution 

      Berge, Jørgen; Heggland, Kristin N.; Lønne, Ole Jørgen; Cottier, Finlo R.; Hop, Haakon; Gabrielsen, Geir W.; Nøttestad, Leif; Misund, Ole Arve (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-03)
      Atlantic mackerel (Scomber scombrus) were recorded in Isfjorden, Svalbard (78˚15ʹ N, 15˚11ʹ E) in late September 2013. This record is the northernmost known occurrence of mackerel in the Arctic and represents a possible northward expansion (of ca. 5˚ latitude) of its distributional range. The examined specimens of mackerel were between 7 and 11 years old, with a mean size of 39 cm and a mean ...

    • First report of freshwater atyid shrimp, Caridina formosae (Decapoda: Caridea) as a host of ectosymbiotic branchiobdellidan, Holtodrilus truncatus (Annelida, Citellata) 

      Maciaszek, Rafał; Jabłońska, Aleksandra; Prati, Sebastian; Świderek, Wiesław (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-20)
      In recent years, ornamental shrimps gained increasing popularity in the aquarium trade. Unfortunately, they are potential vectors of epibionts, which may be unintentionally introduced to aquaria with imported shrimps. This contribution presents the first report of the occurrence of Holtodrilus truncatus on aquarium freshwater shrimp Caridina formosae. A total of 120 shrimp imported from Taiwan as ...

    • First trait-based characterization of Arctic ice meiofauna taxa 

      Patrohay, Evan; Gradinger, Rolf Rudolf; Marquardt, Miriam; Bluhm, Bodil (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-18)
      Trait-based approaches connect the traits of species to ecosystem functions to estimate the functional diversity of communities and how they may respond to environmental change. For the first time, we compiled a traits matrix across 11 traits for 28 species of Arctic ice meiofauna, including Copepoda (Subclass), Nematoda (Phylum), Acoela (Order), Rotifera (Phylum), and Cnidaria (Phylum). Over 50 years ...

    • Fish culling reduces tapeworm burden in Arctic charr by increasing parasite mortality rather than by reducing density-dependent transmission 

      Henriksen, Eirik Haugstvedt; Frainer, André; Knudsen, Rune; Kristoffersen, Roar; Kuris, Armand M.; Lafferty, Kevin D.; Amundsen, Per-Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-25)
      <ol> <li>Two common <i>Dibothriocephalus</i> (formerly <i>Diphyllobothrium</i>) tapeworm species were significantly reduced by experimental culling of their fish host Arctic charr (<i>Salvelinus alpinus</i>) in a subarctic lake.</li><p> <p><li>Between 1984 and 1991, funnel traps were used to cull ~35 metric tons of Arctic charr, reducing charr density by ~80%. As charr densities decreased, ...

    • Fish populations, gill net catches and gill net selectivity in the Lower Orange River, Namibia, from 1995 to 2001 

      Næsje, Tor; Hay, Clinton J.; Nickanor, Nande; Koekemoer, Johan; Strand, Rita; Thorstad, Eva Bonsak (Research report; Forskningsrapport, 2007-01)
      The Orange River: The lower part of the Orange River forms the border between Namibia and South Africa from the mouth of the river and 580 km upstream. The river origins in the Lesotho Highlands, and runs for approximately 2300 km from the source to the Orange River Mouth at Oranjemund (Namibia) and Alexander Bay (South Africa), where it discharges into the Atlantic Ocean. The total Orange ...

    • Fiskebiologiske undersøkelser i Altaelva 2009 

      Ugedal, Ola; Næsje, Tor F.; Thorstad, Eva B.; Saksgård, Laila; Jensen, Jenny; Chittenden, Cedar; Cowley, Paul; Rikardsen, Audun H. (Research report; Forskningsrapport, 2010-06)
      Altaelva er ei av Norges beste elver for sportsfiske etter laks. Stortinget vedtok i 1978 å utbygge og regulere elva for kraftproduksjon. Byggingen av kraftverksdammen ble igangsatt i 1983, og Alta kraftverk ble satt i drift i 1987. Omfattende fiskebiologiske undersøkelser er gjennomført i vassdraget siden 1981. Formålet har vært å dokumentere eventuelle endringer i laksebestanden, finne årsaker ...

    • Fiskebiologiske undersøkelser i Altaelva 2010 

      Ugedal, Ola; Næsje, Tor; Saksgård, Laila M.; Thorstad, Eva Bonsak; Jensen, Jenny; Chittenden, Cedar; Cowley, Paul D.; Rikardsen, Audun H. (Research report; Forskningsrapport, 2011)
      Altaelva er ei av Norges beste elver for sportsfiske etter laks. Stortinget vedtok i 1978 å utbygge og regulere elva for kraftproduksjon. Byggingen av kraftverksdammen ble igangsatt i 1983, og Alta kraftverk ble satt i drift i 1987. Omfattende fiskebiologiske undersøkelser er gjennomført i vassdraget siden 1981. Formålet har vært å dokumentere eventuelle endringer i laksebestanden, finne årsakene ...

    • Five decades of terrestrial and freshwater research at Ny-Ålesund, Svalbard 

      Pedersen, Åshild Ønvik; Convey, P.; Newsham, Kevin K.; Mosbacher, Jesper Bruun; Fuglei, Eva; Ravolainen, Virve; Hansen, Brage Bremset; Jensen, Thomas Correll; Augusti, A.; Biersma, Elisabeth Mackteld; Cooper, Elisabeth J.; Coulson, S.J.; Gabrielsen, Geir W.; Gallet, Jean-Charles; Karsten, U.; Kristiansen, Silje Marie; Svenning, Mette Marianne; Tveit, Alexander; Uchida, M.; Baneschi, I.; Calizza, E.; Cannone, N.; de Goede, E.M.; Doveri, M.; Elster, J.; Giamberini, M.S.; Hayashi, K.; Lang, Simone; Lee, Y.K.; Nakatsubo, T.; Pasquali, V.; Paulsen, I.M.G.; Pedersen, Christina Alsvik; Peng, F.; Provenzale, A.; Pushkareva, E.; Sandström, C.A.M.; Sklet, Vera; Stach, A.; Tojo, M.; Tytgat, B.; Tømmervik, Hans; Velazquez, D.; Verleyen, E.; Welker, J.M.; Yao, Y.-F.; Loonen, M.J.J.E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-19)
      For more than five decades, research has been conducted at Ny-Ålesund, in Svalbard, Norway, to understand the structure and functioning of High-Arctic ecosystems and the profound impacts on them of environmental change. Terrestrial, freshwater, glacial and marine ecosystems are accessible year-round from Ny-Ålesund, providing unique opportunities for interdisciplinary observational and experimental ...

    • Fjellrev i Finnmark : årsrapport 2011 

      Killengreen, Siw Turid; Jensvoll, Ingrid; Henden, John-André; Hamel, Sandra; Ims, Rolf Anker; Mørk, Torill; Sarre, Arne Petter; Ørjebu, Alfred; Bye, Åshild; Knutsen, Kjartan (Research report; Forskningsrapport, 2012)

    • Fjellrev i Finnmark : Årsrapport 2013 

      Ims, Rolf Anker; Killengreen, Siw Turid; Jensvoll, Ingrid; Yoccoz, Nigel Gilles; Henden, John-André; Arriola, Aline; Mørk, Torill; Sarre, Arne Petter; Ørjebu, Alfred; Kristoffersen, Bjørn Hugo; Bye, Åshild (Research report; Forskningsrapport, 2013)
      Prosjekt Fjellrev i Finnmark har pågått siden 2004. Prosjektet har fra starten av hatt to målsetninger: Å gjøre grunnleggende forskning på økosystembetingelser som begrenser fjellrevenbestandens nåværende utbredelse og bestandsvekst i Øst-Finnmark spesielt, og i sub- og lav-Arktis generelt, med fokus på to hypoteser; a) mer uregelmessige og dempede smågnagersykler og b) øket konkurranse med ...

    • Fjellrev i Finnmark : årsrapport for 2008 

      Ims, Rolf Anker; Knutsen, Kjartan; Mørk, T.; Killengreen, Siw Turid; Yoccoz, Nigel Gilles; Sarre, Arne Petter; Ørjebu, Alfred; Henden, John-André (Research report; Forskningsrapport, 2008)

    • Fjellrev i Finnmark : forskning og tiltak 2004 

      Langeland, K.; Ims, Rolf Anker; Killengreen, Siw Turid; Skog, E.; Scheie, J.O.; Yoccoz, Nigel Gilles; Bråthen, Kari Anne (Research report; Forskningsrapport, 2004)

    • Fjellrev i Finnmark : forskning og tiltak 2005 

      Skog, E.; Ims, Rolf Anker; Killengreen, Siw Turid; Scheie, J. O.; Mørk, T.; Yoccoz, Nigel Gilles; Henden, John-André; Langeland, K.; Ravolainen, Virve (Research report; Forskningsrapport, 2005)

    • Fjellrev i Finnmark : forskning og tiltak 2006 

      Knutsen, Kjartan; Ims, Rolf Anker; Mørk, T.; Killengreen, Siw Turid; Langeland, K.; Yoccoz, Nigel Gilles; Henden, John-André; Ravolainen, Virve (Research report; Forskningsrapport, 2006)

    • Fjellrev i Finnmark: Årsrapport 2009 

      Ims, Rolf Anker; Mørk, Torill; Sarre, Arne Petter; Killengreen, Siw Turid; Knutsen, Kjartan; Jensvoll, Ingrid; Yoccoz, Nigel Gilles; Ørjebu, Alfred; Henden, John-André (Research report; Forskningsrapport, 2009)

    • Fjellrev i Finnmark” - Rapport for perioden 2008-2012. 

      Killengreen, Siw Turid; Ims, Rolf Anker; Henden, John-André; Yoccoz, Nigel; Ehrich, Dorothee (Research report; Forskningsrapport, 2013)
      Som et av to prosjekter i en stor nasjonal satsning for å redde den utrydningstruede fjellreven, ble «Fjellrev i Finnmark» startet opp våren 2004. Prosjektet har fra starten av hatt to hovedmålsettinger. 1)Å gjøre grunnleggende forskning på økosystembetingelser som begrenser fjellrevenbestandens nåværende utbredelse og bestandsvekst i Øst-Finnmark spesielt, og i sub- & lav-Arktis generelt, med ...

    • Flavonoid biosynthesis is differentially altered in detached and attached ripening bilberries in response to spectral light quality 

      Samkumar, Amos; Karppinen, Katja; McGhie, Tony K.; Espley, Richard V.; Martinussen, Inger; Jaakola, Laura (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-22)
      Light spectral quality is known to affect flavonoid biosynthesis during fruit ripening. However, the response of fruits to different light conditions, when ripening autonomously from the parent plant (detached), has been less explored. In this study, we analyzed the effect of light quality on detached and naturally ripening (attached) non-climacteric wild bilberry (Vaccinium myrtillus L.) fruits ...

    • Flexibility in a changing arctic food web: Can rough-legged buzzards cope with changing small rodent communities? 

      Fufachev, Ivan A.; Ehrich, Dorothee; Sokolova, Natalia; Sokolov, Vasiliy A; Sokolov, Aleksandr A (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-07)
      Indirect effects of climate change are often mediated by trophic interactions and consequences for individual species depend on how they are tied into the local food web. Here we show how the response of demographic rates of an arctic bird of prey to fluctuations in small rodent abundance changed when small rodent community composition and dynamics changed, possibly under the effect of climate ...

    • Floating Ice-Algal Aggregates below melting Arctic Sea Ice 

      Assmy, P; Ehn, Jens K.; Fernandez-Mendez, M; Hop, H; Katlein, C; Sundfjord, Arild; Bluhm, K; Daase, Malin; Engel, A.; Fransson, A.; Granskog, M.A.; Hudson, SR; Kristiansen, Svein; Nicolaus, M.; Peeken, I.; Renner, AHH; Spreen, Gunnar; Tatarek, Agnieszka; Wiktor, Josef (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      During two consecutive cruises to the Eastern Central Arctic in late summer 2012, we observed floating algal aggregates in the melt-water layer below and between melting ice floes of first-year pack ice. The macroscopic (1-15 cm in diameter) aggregates had a mucous consistency and were dominated by typical ice-associated pennate diatoms embedded within the mucous matrix. Aggregates maintained ...