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    • Linking extreme seasonality and gene expression in Arctic marine protists 

      Wutkowska, Magdalena; Vader, Anna; Logares, Ramiro; Pelletier, Eric; Gabrielsen, Tove M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-05)
      At high latitudes, strong seasonal differences in light availability affect marine organisms and regulate the timing of ecosystem processes. Marine protists are key players in Arctic aquatic ecosystems, yet little is known about their ecological roles over yearly cycles. This is especially true for the dark polar night period, which up until recently was assumed to be devoid of biological activity. ...
    • Lipid content and fatty acid composition of Porosira glacialis and Attheya longicornis in response to carbon dioxide (CO2) aeration 

      Artamonova, Elena; Vasskog, Terje; Eilertsen, Hans Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-18)
      In the current study two novel psychrophilic diatoms Porosira glacialis and Attheya longicornis were tested for suitability to CO2 mitigation coupled with production of the physiologically requisite omega± 3 fatty acids. This study is in line with the worldwide conducted research aimed at applying biorefinery concept to heavy polluting industries. Since the production of algal high value compounds, ...
    • Lipid sac area as a proxy for individual lipid content of arctic calanoid copepods 

      Vogedes, Daniel Ludwig; Varpe, Øystein; Søreide, Janne; Graeve, M; Berge, Jørgen; Falk-Petersen, Stig (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)
      We present an accurate, fast, simple and non-destructive photographic method to estimate wax ester and lipid content in single individuals of the calanoid copepod genus Calanus and test this method against gas-chromatographic lipid measurements.
    • Lipid Status of the Two High Latitude Fish Species, Leptoclinus maculatus and Lumpenus fabricii 

      Murzina, Svetlana A.; Nefedova, Zinaida A.; Falk-Petersen, Stig; Ripatti, Pauli O.; Ruokolainen, Tatiana R.; Pekkoeva, Svetlana N.; Nemova, Nina N. (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      A comparative study of the lipid status (i.e., the total lipid and phospholipid concentrations and the percentage of fatty acids of the total lipids) of adult specimens of daubed shanny (Leptoclinus maculatus) from Svalbard waters (Isfjord) and slender eel blenny (Lumpenus fabricii) from the White Sea (Onega Bay and Tersky shore) was performed to study the metabolism and functions of lipids of these ...
    • Local and regional determinants of colonisation-extinction dynamics of a riparian mainland-island root vole metapopulation 

      Glorvigen, Petter; Andreassen, Harry Peter; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      The role of local habitat geometry (habitat area and isolation) in predicting species distribution has become an increasingly more important issue, because habitat loss and fragmentation cause species range contraction and extinction. However, it has also become clear that other factors, in particular regional factors (environmental stochasticity and regional population dynamics), should be taken ...
    • Local land use associated with socio-economic development in six arctic regions 

      Ehrich, Dorothee; Thuestad, Alma Elizabeth; Tømmervik, Hans; Fauchald, Per; Hausner, Vera Helene (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-04)
      The socioeconomic causes of land use change are complex. They are highly context dependent, but most often studied through case studies. Here, we use a quasi-experimental paired block design to investigate whether better access to wage income leads to more visible land use around 28 settlements in six regions of the circumpolar Arctic. We mapped visible land use on high-resolution satellite images ...
    • Location of studies and evidence of effects of herbivory on Arctic vegetation: a systematic map 

      Soininen, Eeva M; Barrio, Isabel C.; Bjørkås, Ragnhild; Björnsdóttir, Katrin; Ehrich, Dorothee; Hopping, Kelly A.; Kaarlejarvi, E.; Kolstad, Anders Lorentzen; Abdulmanova, Svetlana; Björk, Robert G.; Bueno, C. Guillermo; Eischeid, Isabell; Higgens, Rebecca Finger; Forbey, Jennifer; Gignac, Charles; Gilg, Olivier; Herder, Michael den; Holm, H. S.; Hwang, Bernice; Jepsen, Jane Uhd; Kamenova, Stefaniya; Kater, Ilona; Koltz, Amanda; Kristensen, Jeppe A.; Little, Chelsea J.; Macek, Petr; Mathisen, Karen Marie; Metcalfe, Daniel B.; Mosbacher, Jesper Bruun; Mörsdorf, M.; Park, Taejin; Propster, Jeffrey; Roberts, Aradhana J; Serrano, E; Spiegel, Marcus P.; Tamayo, Mariana; Tuomi, Maria Wilhelmina; Verma, Megha; Vuorinen, Katariina Elsa Maria; Väisänen, Maria; Wal, Rene van der; Wilcots, Megan; Yoccoz, Nigel; Speed, James David Mervyn (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-14)
      Herbivores modify the structure and function of tundra ecosystems. Understanding their impacts is necessary to assess the responses of these ecosystems to ongoing environmental changes. However, the effects of herbivores on plants and ecosystem structure and function vary across the Arctic. Strong spatial variation in herbivore effects implies that the results of individual studies on herbivory ...
    • Long-distance particle transport to the central Ionian Sea 

      Berline, Léo; Doglioli, Andrea Michelangelo; Petrenko, Anne; Barrillon, Stéphanie; Espinasse, Boris Dristan; Le Moigne, Frederic A. C.; Simon-Bot, François; Thyssen, Melilotus; Carlotti, F. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-14)
      Together with T –S properties, particle abundance in situ measurements are useful to discriminate water masses and derive circulation patterns. In the upper layers of the Ionian Sea, the fresher Atlantic Waters (AW) recently crossing the Sicily Channel meet the resident and saltier AW, which circulated cyclonically in the eastern basin and modified after evaporation and eventually cooling. In ...
    • Long-distance plant dispersal to North Atlantic islands: colonization routes and founder effect 

      Alsos, Inger Greve; Ehrich, Dorothee; Eidesen, Pernille Bronken; Solstad, Heidi Merethe; Westergaard, Kristine Bakke; Schonswetter, Peter; Tribsch, Andreas; Birkeland, Siri; Elven, Reidar; Brochmann, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-04-15)
      Long-distance dispersal (LDD) processes influence the founder effect on islands.We use genetic data for 25 Atlantic species and similarities among regional floras to analyse colonization, and test whether the genetic founder effect on five islands is associated with dispersal distance, island size and species traits. Most species colonized postglacially via multiple dispersal events from several ...
    • A long-established invasive species alters the functioning of benthic biofilms in lakes 

      McKie, Brendan G.; Tattersdill, Kristina; Ecke, Frauke; Frainer Barbosa, Andre; Sponseller, Ryan A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-21)
      Invasive species often transform environmental conditions, exclude native species and alter ecosystem functioning, including key ecosystem processes underpinning nutrient and energy cycles. However, such impacts have been most documented during periods of invasive species dominance; their influences on functioning at lower relative abundances and after long-term establishment are less well-known.<p> <p>We ...
    • Long-term ecological studies in northern lakes – challenges, experiences, and accomplishments 

      Amundsen, Per-Arne; Primicerio, Raul; Smalås, Aslak; Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-15)
      We review three long‐term research programs performed over the last four decades on the ecology and management of oligotrophic lake systems with different fish communities at 69&deg; N in Norway. Through whole‐lake perturbation experiments, intensive culling of stunted fish removed 35 tons (1984–1991) of Arctic charr <i>Salvelinus alpinus</i> in Takvatn (15 km<sup>2</sup>) and 153 tons (1981–1983, ...
    • Long-term environmental monitoring for assessment of change: measurement inconsistencies over time and potential solutions 

      Ellingsen, Kari Elsa; Yoccoz, Nigel Gilles; Tveraa, Torkild; Hewitt, Judi E.; Thrush, Simon F. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-30)
      The importance of long-term environmental monitoring and research for detecting and understanding changes in ecosystems and human impacts on natural systems is widely acknowledged. Over the last decades, a number of critical components for successful long-term monitoring have been identified. One basic component is quality assurance/quality control protocols to ensure consistency and comparability ...
    • Long-term herbivore removal experiments reveal how geese and reindeer shape vegetation and ecosystem CO2-fluxes in high-Arctic tundra 

      Petit Bon, Matteo; Hansen, Brage Bremset; Loonen, M. J. J. E; Petraglia, Alessandro; Bråthen, Kari Anne; Böhner, Hanna; Layton-Matthews, Kate; Beard, Karen H.; Le Moullec, Mathilde; Jonsdottir, Ingibjorg Svala; Van der Wal, René (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-23)
      1. Given the current rates of climate change, with associated shifts in herbivore population densities, understanding the role of different herbivores in ecosystem functioning is critical for predicting ecosystem responses. Here, we examined how migratory geese and resident, non-migratory reindeer—two dominating yet functionally contrasting herbivores—control vegetation and ecosystem processes in ...
    • Long-term monitoring of exposure to toxic and essential metals and metalloids in the tawny owl (Strix aluco): Temporal trends and influence of spatial patterns 

      Devalloir, Quentin; Fritsch, Clementine; Bangjord, Georg; Bårdsen, Bård-Jørgen; Bourgeon, Sophie; Eulaers, Igor; Bustnes, Jan Ove (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-10)
      As a result of regulatory decisions, atmospheric deposition of most toxic metals and metalloids (MEs) has decreased in Europe over the past few decades. However, little is known about how this reduction translates into exposure at higher trophic levels in the terrestrial environment where temporal trends may be spatially heterogeneous due to local current or legacy sources of emissions (e.g., industry) ...
    • Long-term responses of Icelandic Arctic foxes to changes in marine and terrestrial ecosystems 

      Berthelot, Fanny Marie Lou; Unnsteinsdóttir, Ester R.; Ellgutter, Jennifer Alejandrina Carbonell; Ehrich, Susanna Dorothee (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-04)
      The long-term dynamics of predator populations may be driven by fluctuations in resource availability and reflect ecosystem changes such as those induced by climate change. The Icelandic Arctic fox (Vulpes lagopus) population has known major fluctuations in size since the 1950s. Using stable isotopes analysis of bone collagen over a long-time series (1979– 2018), we aimed at identifying the main ...
    • Long-term responses of zooplankton to invasion by a planktivorous fish in a subarctic watercourse 

      Amundsen, Per-Arne; Siwertsson, Anna; Primicerio, Raul; Bøhn, Thomas (Journal article; Tidsskriftartikkel; Peer reviewed, 2008-08-13)
      <p>1. Introduced or invading predators may have strong impacts on prey populations of the recipient community mediated by direct and indirect interactions. The long‐term progression of predation effects, covering the invasion and establishment phase of alien predators, however, has rarely been documented.</p> <p>2. This paper documents the impact of an invasive, specialized planktivorous fish ...
    • Long-term variability in overwintering copepod populations in the Lofoten Basin: The role of the North Atlantic oscillation and trophic effects 

      Weidberg, Nicholas; Basedow, Sünnje Linnéa (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-08)
      Critical gaps in knowledge hinder our ability to infer spatiotemporal dynamics in pelagic ecosystems. In particular, environmental changes affecting key copepod species while overwintering in deep waters are still not well understood. Here, we analyzed an 11 yr time series (2000–2010) of winter (January/February) samplings in the Lofoten Basin to characterize the spatial distribution of <i>Calanus ...
    • Long-term warming-induced trophic downgrading in the soil microbial food web 

      Dahl, Mathilde Borg; Söllinger, Andrea; Sigurðsson, Páll; Janssens, Ivan; Peñuelas, Josep; Sigurdsson, Bjarni D.; Richter, Andreas; Tveit, Alexander; Urich, Tim (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-01)
      Climatic warming has been hypothesized to accelerate organic matter decomposition by soil microorganisms and thereby enhance carbon (C) release to the atmosphere. However, the long-term consequences of soil warming on belowground biota interactions are poorly understood. Here we investigate how geothermal warming by 6 °C for more than 50 years affects soil microbiota. Using metatranscriptomics we ...
    • The longer the better: the effect of substrate on sessile biota in Arctic kelp forests 

      Shunatova, Natalia; Nikishina, Daria; Ivanov, Mikhail V.; Berge, Jørgen; Renaud, Paul E.; Ivanova, Tatiana; Granovitch, Andrei (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-02-02)
      Kelps are ecosystem engineers and thus enhance biodiversity and subsidize food webs in nearshore areas. Numerous studies describing diversity and abundance of biota associated with kelp have focused on sub-tropical and temperate waters while kelp forests at high latitudes, where kelp is predicted to expand in distribution, remain mostly unexplored. Kelp forests contribute significantly to regional ...
    • Loss of deuterium in faecal solids and by sequestration in reindeer. Effect on doubly labelled water studies. 

      Milne, Eric; Gotaas, Geir; Haggarty, Paul; Tyler, Nicholas J.C. (Journal article; Peer reviewed; Tidsskriftartikkel, 2000)