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  • Quantifying individual heterogeneity and its influence on life-history trajectories: different methods for different questions and contexts 

    Hamel, Sandra; Gaillard, Jean-Michel; Douhard, Mathieu; Festa-Bianchet, Marco; Pelletier, Fanie; Yoccoz, Nigel Gilles (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-25)
    Heterogeneity among individuals influences the life‐history trajectories we observe at the population level because viability selection, selective immigration and emigration processes, and ontogeny change the proportion of individuals with specific trait values with increasing age. Here, we review the two main approaches that have been proposed to account for these processes in life‐history trajectories, ...
  • Data on European seafood biomass production by country, sectors, and species in 2004–2014 and on ecological characteristics of the main species produced 

    Blanchet, Marie-Anne; Primicerio, Raul; Smalås, Aslak; Arias-Hansen, Juliana; Aschan, Michaela (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-30)
    In this data article, we present the 2004–2014 average European seafood production volume by production sector, country, and species. The production data originates from the Food and Agriculture Organisation of the United Nations (FAO) and covers three production sectors: Marine fisheries, marine aquaculture, and freshwater production. We present the main ecological characteristics of each species ...
  • Effects of inconsistent reporting, regulation changes and market demand on abundance indices of sharks caught by pelagic longliners off southern Africa 

    Jordaan, Gareth L.; Santos, Jorge; Groeneveld, Johan C. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-24)
    The assumption of a proportional relationship between catch-per-unit-effort (CPUE) and the abundance of sharks caught by pelagic longliners is tenuous when based on fisher logbooks that report only retained specimens. Nevertheless, commercial logbooks and landings statistics are often the only data available for stock status assessments. Logbook data collected from local and foreign pelagic longline ...
  • Trait-based approaches in rapidly changing ecosystems: A roadmap to the future polar oceans 

    Degen, Renate; Aune, Magnus; Bluhm, Bodil; Cassidy, Camilla; Kędra, Monika; Kraan, Casper; Vandepitte, Leen; Włodarska-Kowalczuk, Maria; Zhulay, Irina; Albano, Paolo G.; Bremner, Julie; Grebmeier, Jacqueline M.; Link, Heike; Morata, Nathalie; Nordström, Marie C.; Shojaei, Mehdi Ghodrati; Sutton, Lauren; Zuschin, Martin (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-30)
    Polar marine regions are facing rapid changes induced by climate change, with consequences for local faunal populations, but also for overall ecosystem functioning, goods and services. Yet given the complexity of polar marine ecosystems, predicting the mode, direction and extent of these consequences remains challenging. Trait-based approaches are increasingly adopted as a tool by which to explore ...
  • Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse 

    Jensen, Hallvard; Bøhn, Thomas; Amundsen, Per-Arne; Aspholm, Paul Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2004-02)
    Feeding ecology of piscivorous brown trout was studied in the Pasvik watercourse, Norway and Russia. The watercourse is heavily regulated for hydroelectric purposes, and 5000 brown trout > 25 cm are stocked annually to compensate the negative impacts of the impoundments. Stocked and wild trout had almost identical diets consisting mainly of vendace Coregonus albula and partly of whitefish Coregonus ...
  • Ecological stoichiometry and nutrient partitioning in two insect herbivores responsible for large-scale forest disturbance in the Fennoscandian subarctic 

    Metcalfe, Daniel B.; Cherif, Mehdi; Jepsen, Jane Uhd; Vindstad, Ole Petter Laksforsmo; Kristensen, Jeppe Å.; Belsing, Ulrika (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-04)
    <p>1. Outbreaks of herbivorous insects can have large impacts on regional soil carbon (C) storage and nutrient cycling. In northernmost Europe, population outbreaks of several geometrid moth species regularly cause large‐scale defoliation in subarctic birch forests. An improved understanding is required of how leaf C and nutrients are processed after ingestion by herbivores and what this means for ...
  • Haul-out behaviour of Arctic ringed seals (Pusa hispida): inter-annual patterns and impacts of current environmental change 

    Hamilton, Charmain Danielle; Kovacs, Kit M.; Ims, Rolf Anker; Lydersen, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-27)
    Hauling out onto a solid substrate is an integral part of most pinnipeds’ activity budgets. Ringed seals (<i>Pusa hispida</i>) are an Arctic species that hauls out on sea ice routinely throughout the year. In 2006, a sudden change in the sea-ice regime occurred in Svalbard (Norway). Amongst other changes, the amount of land-fast ice declined sharply. This study examined the intra- and inter-annual ...
  • Concomitant Temperature Stress and Immune Activation may Increase Mortality Despite Efficient Clearance of an Intracellular Bacterial Infection in Atlantic Cod 

    Larsen, Anett Kristin; Nymo, Ingebjørg Helena; Sørensen, Karen Kristine; Seppola, Marit; Rødven, Rolf; Jiménez de Bagüés, María Pilar; Al Dahouk, Sascha; Godfroid, Jacques (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-04)
    The environmental temperature has profound effects on biological systems of marine aquatic organisms and plays a critical role in species distribution and abundance. Particularly during the warmer seasons, variations in habitat temperature may introduce episodes of stressful temperatures which the organisms must adapt to and compensate for to maintain physiological homeostasis. The marine environment ...
  • Maximum Yield Fishing and Optimal Fleet Composition. A Stage Structured Model Analysis With an Example From the Norwegian North-East Arctic Cod Fishery 

    Helgesen, Irmelin Slettemoen; Skonhoft, Anders; Eide, Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-01)
    A stage structured fishery model with three stages; recruits, immature fish and mature fish is formulated and utilized to analyse maximum sustainable yield (MSY) and optimal harvesting composition in a fishery with two heterogeneous fleets. The stage structured model developed bundles the age classes found in age structured models into stage classes based on their level of maturity, but also the ...
  • How can a binary switch within the pars tuberalis control seasonal timing of reproduction? 

    Wood, Shona Hiedi (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10)
    Life in seasonally changing environments is challenging. Biological systems have to not only respond directly to the environment, but also schedule life history events in anticipation of seasonal changes. The cellular and molecular basis of how these events are scheduled is unknown. Cellular decision-making processes in response to signals above certain thresholds regularly occur i.e. cellular fate ...
  • Who's at risk in the backcountry? Effects of individual characteristics on hypothetical terrain choices 

    Mannberg, Andrea; Hendrikx, Jordy; Landrø, Markus; Ahrland Stefan, Martin (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-18)
    We use data from an online survey in Norway (N = 467, 73% male; age: M = 34, SD = 10.07) to analyze hypothetical choices in hazardous avalanche terrain. We further analyze differences in stated preference for and willingness to accept to ski relatively risky terrain. Our results suggest that risk attitudes and perception constitute important determinants for hypothetical terrain choices. We further ...
  • Human long intrinsically disordered protein regions are frequent targets of positive selection 

    Afanasyeva, Arina; Bockwoldt, Mathias; Cooney, Christopher; Heiland, Ines; Gossmann, Toni Ingolf (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-01)
    Intrinsically disordered regions occur frequently in proteins and are characterized by a lack of a well-defined three-dimensional structure. Although these regions do not show a higher order of structural organization, they are known to be functionally important. Disordered regions are rapidly evolving, largely attributed to relaxed purifying selection and an increased role of genetic drift. It has ...
  • Spatio-temporal patterns of genetic variation in Arbacia lixula, a thermophilous sea urchin in expansion in the Mediterranean 

    Pérez-Portela, Rocío; Wangensteen Fuentes, Owen Simon; García-Cisneros, Alex; Valero-Jiménez, Claudio; Palacín, Creu; Turon, Xavier (Journal article; Tidsskriftartikkel; Preprint; Manuskript, 2018-06-14)
    The genetic structure of 13 populations of the amphiatlantic sea urchin <i>Arbacia lixula</i>, as well as temporal genetic changes in three of these localities, were assessed using ten hypervariable microsatellite loci. This thermophilous sea urchin is an important engineer species triggering the formation of barren grounds through its grazing activity. Its abundance seems to be increasing in most ...
  • From PhD to job market: Transforming doctoral training with the SAF21 model 

    Borit, Melania; Weber, Charlotte Teresa; Risan Johnsen, Hanne (Journal article; Tidsskriftartikkel, 2017-03)
  • Who Eats Seaweed? An Australian Perspective 

    Birch, Dawn; Skallerud, Kåre; Paul, Nicholas (Journal article; Tidsskriftartikkel; Preprint; Manuskript, 2018-12-14)
    Current seaweed consumption and attitudes and preferences toward seaweed food products in a Western society are investigated to inform the seaweed industry regarding product development and marketing strategies. A national survey of 521 Australian consumers was conducted. About 75% of respondents had eaten seaweed; however, only 37% had consumed seaweed regularly over the past 12 months. Key drivers ...
  • Under the canopy: Community-wide effects of invasive algae in Marine Protected Areas revealed by metabarcoding 

    Wangensteen Fuentes, Owen Simon; Cebrian, Emma; Palacín, Creu; Turon, Xavier (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-21)
    We analysed with multigene (18S and COI) metabarcoding the effects of the proliferation of invasive seaweeds on rocky littoral communities in two Spanish Marine Protected Areas. The invasive algae studied were <i>Caulerpa cylindracea</i>, <i>Lophocladia lallemandii</i> and <i>Asparagopsis armata</i>. They are canopy-forming, landscape-dominant seaweeds, and we were interested in their effects on the ...
  • Modelling gear and fishers size selection for escapees, discards, and landings: a case study in Mediterranean trawl fisheries 

    Mytilineou, Chryssi; Herrmann, Bent; Mantopoulou-Palouka, Danai; Sala, Antonello; Megalofonou, Persefoni (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-19)
    Gear selectivity and discards are important issues related to fisheries management but separately modelled. This work examines for the first time the overall size-selection pattern on the total amount of individuals of a species entering the trawl codend. An innovative approach was used based on modelling the escapement through the codend in the sea and the subsequently selection process by the ...
  • Bycatch reduction in the Norwegian deep-water shrimp (Pandalus borealis) fishery with a double grid selection system 

    Larsen, Roger B.; Herrmann, Bent; Sistiaga, Manu Berrondo; Brinkhof, Jesse; Grimaldo, Eduardo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-25)
    Trawlers targeting Deep-water Shrimp (<i>Pandalus borealis</i>) in the North Atlantic use a Nordmøre sorting grid ahead of a small-meshed codend. Based on experimental fishing, the effect of adding a 9 mm spaced release grid behind the mandatory 19 mm spaced Nordmøre sorting grid, was determined. The performance in terms of size selection of the release grid and the two grids combined were assessed ...
  • Assessing the impact of buffer towing on the quality of Northeast Atlantic cod (Gadus morhua) caught with a bottom trawl 

    Brinkhof, Jesse; Larsen, Roger B.; Herrmann, Bent; Olsen, Stein Harris (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-28)
    The dense aggregations of Northeast Atlantic cod (Gadus morhua) in the Barents Sea have led to a new fishing practice termed “buffer towing.” In this fishery, many trawlers redeploy the trawl directly after taking the catch onboard in an attempt to secure a continuous supply of fish and avoid any unnecessary stops during processing. If the approximate desired amount of fish is caught or exceeded ...
  • Present and future temporal profiles and their relationship to health intentions and behaviors: A test on a Norwegian general population sample 

    Pozolotina, Tatiana; Olsen, Svein Ottar (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-13)
    We investigated the temporal profiles of a Norwegian general population sample and their relation to health behaviors and intentions. The profiles were based on variables from the present and future dimensions of the Zimbardo Time Perspective Inventory (ZTPI), the Consideration of Future Consequences Scale (CFCS), and the combination of both scales. The analysis revealed that there were only two ...

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