Now showing items 160-179 of 372

    • Harvest control rules in modern fisheries management 

      Kvamsdal, Sturla F; Eide, Arne; Ekerhovd, Nils-Arne; Enberg, Katja; Gudmundsdottir, Asta; Hoel, Alf Håkon; Mills, Katherine E.; Mueter, Franz J.; Ravn-Jonsen, Lars; Sandal, Leif Kristoffer; Stiansen, Jan Erik; Vestergaard, Niels (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-20)
      Harvest control rules have become an important tool in modern fisheries management, and are increasingly adopted to provide continuity in management practices, to deal with uncertainty and ecosystem considerations, and to relieve management decisions from short-term political pressure. We provide the conceptual and institutional background for harvest control rules, a discussion of the structure of ...
    • A head start for an invasive species in a strongly seasonal environment? Growth of Elodea canadensis in boreal lakes 

      Tattersdill, Kristina; Ecke, Frauke; Frainer, André; McKie, Brendan G. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-20)
      Many invasive species are expanding northwards into boreal and subarctic habitats, but research on the factors favoring their establishment in these regions remains limited. In three Swedish lakes we investigated the growth of Elodea canadensis Michx, a highly invasive macrophyte that is spreading northwards in Europe and Alaska. We conducted an in situ growth experiment, maintained for ten months, ...
    • Heat treatment increases the protein bioaccessibility in the red seaweed dulse (Palmaria palmata), but not in the brown seaweed winged kelp (Alaria esculenta) 

      Mæhre, Hanne K; Edvinsen, Guro Kristine; Eilertsen, Karl-Erik; Elvevoll, Edel Oddny (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-04-25)
      Bioaccessibility of plant proteins has been shown to be inferior to that of proteins of animal origin. Heat treatment has been shown to positively affect this in some plants. The aim of this study was to investigate the effect of heat treatment on bioaccessibility of seaweed proteins. An in vitro gastrointestinal digestion model was used for evaluation of potential effects on the brown seaweed Alaria ...
    • Histological and bacteriological changes in intestine of beluga (Huso huso) following ex vivo exposure to bacterial strains 

      Salma, Wahida; Zhou, Zhigang; Wang, Wenwan; Askarian, Fatemeh; Kousha, Armin; Ebrahimi, Maryam Tajabadi; Myklebust, Reidar; Ringø, Einar (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      In the present study the intestinal sac method (ex vivo) was used to evaluate the interactions between lactic acid bacteria and staphylococci in the gastrointestinal (GI) tract of beluga (Huso huso). The distal intestine (DI) of beluga was exposed ex vivo to Staphylococcus aureus, Leuconostoc mesenteroides and Lactobacillus plantarum. Histological changes following bacterial exposure were assessed ...
    • Homing of Antigen-Presenting Cells in Head Kidney and Spleen – Salmon Head Kidney Hosts Diverse APC Types 

      Iliev, Dimitri Borisov; Thim, Hanna Leena; Lagos, Leidy; Olsen, randi; Jørgensen, Jorunn B (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Lymph nodes and spleen are major organs where mammalian antigen-presenting cells (APCs) initiate and orchestrate Ag-specific immune responses. Unlike mammals, teleosts lack lymph nodes and an interesting question is whether alternative organs may serve as sites for antigen presentation in teleosts. In the current study, fluorescent ovalbumin (Ova) and CpG oligonucleotides (ODNs) injected intra-abdominally ...
    • How many fish need to be measured to effectively evaluate trawl selectivity? 

      Herrmann, Bent; Sistiaga, Manu Berrondo; Santos, Juan; Sala, Antonello (Journal article; Tidsskriftartikkel; Peer reviewed, 2016)
      The aim of this study was to provide practitioners working with trawl selectivity with general and easily understandable guidelines regarding the fish sampling effort necessary during sea trials. In particular, we focused on how many fish would need to be caught and length measured in a trawl haul in order to assess the selectivity parameters of the trawl at a designated uncertainty level. We also ...
    • How vulnerable is the European seafood production to climate warming? 

      Blanchet, Marie-Anne; Primicerio, Raul; Smalås, Aslak; Arias-Hansen, Juliana; Aschan, Michaela (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-16)
      The main challenge for the European seafood industry is to ensure sustainable production volume while adapting to climate warming. Marine fisheries mainly target 41 species which account for 80% of the seafood production in Europe. The remaining 20% comes from marine and freshwater aquaculture, which harvest mainly 5 and 11 species, respectively. European seafood production volume (2004–2014) recorded ...
    • Hundreds of species observations and four ascomycetes new to Norway during a mycology field course 

      Rämä, Teppo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018)
      During a mycology field course in Drøbak 29th August – 2nd September 2011 several interesting and some new taxa to Norway were found. Species not previously recorded in Norway include <i>Tatraea dumbirensis, Corollospora maritima, Nectriopsis candicans</i> and <i>Ombrophila juniperinella</i>. A list of 413 taxa, including records of three threatened species, is given and the ecology and distribution ...
    • Hva begrenser tilgangen på sjøareal til havbruksnæringen? 

      Hersoug, Bjørn; Andreassen, Otto; Johnsen, Jahn Petter; Robertsen, Roy (Research report; Forskningsrapport, 2014-08-13)
      Prosjektet har hovedfokus på havbruksnæringens lokalitetstilgang sett i lys av økt arealbehov ut fra havbruknæringens ønske om vekst. Denne veksten er ikke uproblematisk, for bruk av kystsonen utfordres av mange interesser og brukerere. De siste årene har bærekraftig utvikling av næringen hatt sterkt fokus, hvor klare miljøutfordringer relatert til påvirkning av villaks, luseproblematikk, forurensing, ...
    • Hvordan planlegges kystsonen? Kartlegging av gjeldende planpraksis etter plan- og bygningsloven i sjøområdene 

      Sørdahl, Patrick Berg; Solås, Ann-Magnhild; Kvalvik, Ingrid; Hersoug, Bjørn (Research report; Forskningsrapport, 2017-06)
      Planlegging i kystsonen har de senere år blitt bedre, og det gjøres mye godt planarbeid ute i kommunene. Flere og flere kommuner har vedtatte planer som dekker sjøarealet, antall interessenter som involveres øker, og omfanget og kvaliteten av datagrunnlaget blir stadig bedre. Flere kommuner tar også initiativ til interkommunale samarbeid hvor større sjøarealer planlegges på tvers av kommunegrensene. ...
    • The impact of coastal grabbing on community conservation – a global reconnaissance 

      Bavinck, Jan Maarten; Berkes, Fikret; Charles, Anthony; Dias, Ana Carolina Esteves; Doubleday, Nancy; Nayak, Prateep; Sowman, Merle (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-14)
      "Coastal grab" refers to the contested appropriation of coastal (shore and inshore) space and resources by outside interests. This paper explores the phenomenon of coastal grabbing and the effects of such appropriation on community-based conservation of local resources and environment. The approach combines social-ecological systems analysis with socio-legal property rights studies. Evidence of ...
    • Impact of Multiple Ecological Stressors on a Sub-Arctic Ecosystem: No Interaction Between Extreme Winter Warming Events, Nitrogen Addition and Grazing 

      Bokhorst, Stef; Berg, Matty P.; Edvinsen, Guro Kristine; Ellers, Jacintha; Heitman, Amber; Jaakola, Laura; Mæhre, Hanne K; Phoenix, Gareth K.; Tømmervik, Hans; Bjerke, Jarle W. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-30)
      Climate change is one of many ongoing human-induced environmental changes, but few studies consider interactive effects between multiple anthropogenic disturbances. In coastal sub-arctic heathland, we quantified the impact of a factorial design simulating extreme winter warming (WW) events (7 days at 6–7∘C) combined with episodic summer nitrogen (+N) depositions (5 kg N ha-1) on plant winter physiology, ...
    • The importance of ecological networks in multiple-stressor research and management 

      Bruder, Andreas; Frainer, André; Rota, Thibaut; Primicerio, Raul (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-07)
      Multiple stressors are increasingly affecting organisms and communities, thereby modifying ecosystems' state and functioning. Raising awareness about the threat from multiple stressors has increased the number of experimental and observational studies specifically addressing consequences of stressor interactions on biota. Most studies measure the direct effects of multiple stressors and their ...
    • Industry-led fishing gear development: Can it facilitate the process? 

      Veiga-Malta, Tiago; Feekings, Jordan; Herrmann, Bent; Krag, Ludvig A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-16)
      In the reformed technical measures regulation, the European Union proposed a greater involvement of the fishing industry in the different managerial aspects of fisheries. However, having the industry as a main actor in gear development presents a new suite of challenges. The industry, while addressing an issue in the fishery, can modify several aspects of a fishing gear simultaneously, without ...
    • Infectious pancreatic necrosis virus proteins VP2, VP3, VP4 and VP5 antagonize IFNa1 promoter activation while VP1 induces IFNa1 

      Lauksund, Reidunn Silje; Greiner-Tollersrud, Linn; Chang, Chia Jung; Robertsen, Børre (Journal article; Tidsskriftartikkel; Peer reviewed, 2015)
      Infectious pancreatic necrosis virus (IPNV) is one of the major viral pathogens causing disease in farmed Atlantic salmon worldwide. In the present work we show that several of the IPN proteins have powerful antagonistic properties against type I IFN induction in Atlantic salmon. Each of the five IPNV genes cloned into an expression vector were tested for the ability to influence activation of the ...
    • Influence of preservation methods, sample medium and sampling time on eDNA recovery in a neotropical river 

      Sales, Naiara Guimaraes; Wangensteen Fuentes, Owen Simon; Carvalho, Daniel C.; Mariani, Stefano (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-31)
      Environmental DNA (eDNA) has rapidly emerged as a promising biodiversity monitoring technique, proving to be a sensitive and cost‐effective method for species detection. Despite the increasing popularity of eDNA, several questions regarding its limitations remain to be addressed. We investigated the effect of sampling medium and time, and preservation methods, on fish detection performance based on ...
    • Influence of soak time on catch performance of commercial creels targeting Norway lobster (Nephrops norvegicus) in the Mediterranean Sea 

      Brčić, Jure; Herrmann, Bent; Mašanović, Marina; Šifner, Svjetlana Krstulović; Škeljo, Frane (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-13)
      Creel catch performance is known to be affected by the soak time in many fisheries. If creels maintained their efficiency over longer periods, increase in soak time should lead to proportional increase in catch quantity. However, the exact shape of this relationship is unknown for creel fisheries targeting Norway lobster (Nephrops norvegicus). If it was known fishermen could adjust their fishing ...
    • The influence of weight and gender on intestinal bacterial community of wild largemouth bronze gudgeon (Coreius guichenoti, 1874) 

      Li, Xuemei; Yan, Qingyun; Ringø, Einar; Wu, Xingbing; He, Yongfeng; Yang, Deguo (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08-22)
      Background: Largemouth bronze gudgeon (Coreius guichenoti) is of economic importance in China, distributed in upstream regions of the Yangtze River in China. But it has recently dramatically declined and is close to elimination. However, there is little knowing about the character of its intestinal microbiota. This study was conducted to elucidate the intestinal microbiota of wild largemouth bronze ...
    • Informing management strategies for a reserve: Results from a discrete choice experiment survey 

      Bui, Bich Xuan; Sandorf, Erlend Dancke; Aanesen, Margrethe (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-18)
      It is well-known that operating within the boundaries of a national park provides commercial actors with the opportunity to charge a price premium, though this has to a lesser degree been demonstrated for marine protected areas. We estimate national tourists' willingness-to-pay a price premium for boat trips in the Nha Trang Bay Marine Protected Are, Vietnam, using a discrete choice experiment. Our ...
    • Institutional challenges for effective governance of consumptive wildlife tourism: case studies of marine angling tourism in Iceland and Norway 

      Solstrand, Maria-Victoria (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-04-08)
      Good governance of consumptive wildlife tourism, a complex socio-ecological system, requires finding the right balance between natural resource and tourism management. Fishing takes the lead globally as the most popular product offering within consumptive wildlife tourism, and both Iceland and Norway offer a marine angling tourism product. The two countries offer similar pristine Arctic fjord ...