Viser treff 1-20 av 1541

    • Panel-based assessment of ecosystem condition as a platform for adaptive and knowledge driven management 

      Jepsen, Jane Uhd; Arneberg, Per; Ims, Rolf Anker; Siwertsson, Anna; Yoccoz, Nigel Gilles; Fauchald, Per; Pedersen, Åshild Ønvik; van der Meeren, Gro Ingleid; von Quillfeldt, Cecilie H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-13)
      Ecosystems are subjected to increasing exposure to multiple anthropogenic drivers. This has led to the development of national and international accounting systems describing the condition of ecosystems, often based on few, highly aggregated indicators. Such accounting systems would benefit from a stronger theoretical and empirical underpinning of ecosystem dynamics. Operational tools for ecosystem ...
    • Herbivore diversity effects on Arctic tundra ecosystems: a systematic review 

      Barbero-Palacios, Laura; Barrio, Isabel C.; García Criado, Mariana; Kater, Ilona; Petit Bon, Matteo; Kolari, Tiina H. M.; Bjørkås, Ragnhild; Trepel, Jonas; Lundgren, Erick; Björnsdóttir, Katrín; Hwang, Bernice C.; Bartra Cabre, Laura; Defourneaux, Mathilde; Ramsay, Jennifer; Lameris, Thomas K.; Leffler, A. Joshua; Lock, Janine G.; Kuoppamaa, Mari S.; Kristensen, Jeppe A.; Bjorkman, Anne D.; Myers-Smith, Isla; Lecomte, Nicolas; Axmacher, Jan C.; Den Herder, Michael; Pagneux, Emmanuel P.; Skarin, Anna; Sokolova, Natalia; Windirsch, Torben; Wheeler, Helen Claire; Serrano, Emmanuel; Virtanen, Tarmo; Hik, David S.; Kaarlejärvi, Elina; Speed, James David Mervyn; Soininen, Eeva M; Gilg, Olivier (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-25)
      Background Northern ecosystems are strongly influenced by herbivores that differ in their impacts on the eco‑ system. Yet the role of herbivore diversity in shaping the structure and functioning of tundra ecosystems has been overlooked. With climate and land-use changes causing rapid shifts in Arctic species assemblages, a better under‑ standing of the consequences of herbivore diversity changes for ...
    • Changing species dominance patterns of Boreal-Arctic heathlands: evidence of biotic homogenization 

      Bråthen, Kari Anne; Tuomi, Maria Wilhelmina; Kapfer, Jutta; Böhner, Hanna; Maliniemi, Tuija (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-29)
      Heathlands are extensive systems often dominated by slow-growing and long-lived woody plants. These systems require longer-term studies to capture if and how they are changing over time. In 2020, we resurveyed species richness and cover of vascular plant communities in 139 heathlands along the coastline of northern Fennoscandia, first surveyed during 1965–1975. The first survey included six ...
    • Camera traps reveal seasonal variation in activity and occupancy of the Alpine mountain hare Lepus timidus varronis 

      Bison, Marjorie; Yoccoz, Nigel Gilles; Carlson, Bradley Z.; Bayle, Arthur; Delestrade, Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-01)
      Mountain hare is a cold-adapted species threatened by climate change, but despite its emblematic nature, our understanding of the causes of population decline remains limited. Camera traps are increasingly used in ecology as a tool for monitoring animal populations at large spatial and temporal scales. In mountain environments where field work is constrained by difficult access and harsh ...
    • Taxonomic and functional-trait metrics track recovery of demersal fish and shrimp communities following system collapse 

      Wiedmann, Magnus Aune; Ramasco, Virginie; Wells, Nadine; Warren, Margaret; Cyr, Frédéric; Pedersen, Eric J.; Koen-Alonso, Mariano; Eriksen, Elena; Primicerio, Raul; Lindstrøm, Ulf Ove; Renaud, Paul Eric (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-11)
      Monitoring programs that integrate both structural and functional ecosystem components play integral roles in ecosystem management and conservation planning. In the early 1990’s, the marine ecosystem of the waters surrounding Newfoundland and Labrador (NL) underwent a regime shift. Several demersal and pelagic fish stocks collapsed simultaneously, and this had significant ecological and socioeconomic ...
    • Low spatial habitat overlap of herbivores in the High Arctic tundra 

      Ravolainen, Virve; Paulsen, Ingrid Marie Garfelt; Eischeid, Isabell; Forbey, Jennifer Sorensen; Fuglei, Eva; Hájek, Tomás; Hansen, Brage Bremset; Loe, Leif Egil; Macek, Petr; Madsen, Jesper; Soininen, Eeva M; Speed, James David Mervyn; Stien, Audun; Tømmervik, Hans; Pedersen, Åshild Ønvik (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-04)
      Herbivores play a crucial role in shaping tundra ecosystems through their effects on vegetation, nutrient cycling, and soil abiotic factors. Understanding their habitat use, co-occurrence, and overlap is therefore essential for informing ecosystem-based management and conservation. In the High Arctic, only a marginal proportion of the land area is vegetated, and climate change is impacting ...
    • Necropsy findings, meat control pathology and causes of loss in semi-domesticated reindeer (Rangifer tarandus tarandus) in northern Norway 

      Mørk, Torill; Eira, Henrik Isaksen; Rødven, Rolf; Nymo, Ingebjørg Helena; Blomstrand, Berit Marie; Guttormsen, Sandra; Olsen, Line; Davidson, Rebecca K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-04)
      Background Reindeer herding in Norway is based on traditional Sámi pastoralism with the animals free ranging throughout the year. The animals move over large areas in varying terrain and often in challenging weather conditions. Winter crises, such as difficult grazing conditions caused by icing or large amounts of snow, are survival bottlenecks for reindeer. Calves are especially vulnerable, and ...
    • Seasonal acoustic presence of marine mammals at the South Orkney Islands, Scotia Sea 

      Åsvestad, Linn; Ahonen, Heidi; Menze, Sebastian; Lowther, Andrew; Lindstrøm, Ulf Ove; Krafft, Bjørn Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-03)
      Increased knowledge about marine mammal seasonal distribution and species assemblage from the South Orkney Islands waters is needed for the development of management regulations of the commercial fishery for Antarctic krill (Euphausia superba) in this region. Passive acoustic monitoring (PAM) data were collected during the autumn and winter seasons in two consecutive years (2016, 2017), which ...
    • A versatile, semi-automated image analysis workflow for time-lapse camera trap image classification 

      Celis, Gerardo; Ungar, Peter; Sokolov, Aleksandr; Soininen, Eeva M; Böhner, Hanna; Liu, Desheng; Gilg, Olivier; Fufachev, Ivan; Pokrovskaya, Olga; Ims, Rolf Anker; Zhou, Wenbo; Morris, Dan; Ehrich, Dorothee (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-26)
      Camera traps are a powerful, practical, and non-invasive method used widely to monitor animal communities and evaluate management actions. However, camera trap arrays can generate thousands to millions of images that require significant time and effort to review. Computer vision has emerged as a tool to accelerate this image review process. We propose a multi-step, semi-automated workflow which ...
    • Survey report (Part 2) from the joint Norwegian/Russian Ecosystem Survey in the Barents Sea and the adjacent waters August-October 2023 — Marine environment, Mesozooplankton, Commercial Demersal Fish, Fish Biodiversity, Commercial Shellfish, Benthic Invertebrate Community, Marine Mammals and Seabirds 

      Prozorkevich, Dmitri; Eriksen, Elena; Karlson, Stine; Trofimov, Aleksander; Ingvaldsen, Randi Brunvær; Grøsvik, Bjørn Einar; Prokhorova, Tatiana; Klepikovskiy, Roman; Bagøien, Espen; Johannesen, Edda; Bogstad, Bjarte; Wiedmann, Magnus Aune; Krivosheya, Pavel; Prokopchuk, Irina; Windsland, Kristin; Russkikh, Alexey; Wienerroither, Rupert; Filin, Anatoly; Zimmermann, Fabian; Hjelset, Ann Merete; Danielsen, Hanna Ellerine Helle; Bakanev, sergei; Stesko, Aleksei; Jørgensen, Lis Lindal; Blinova, Daria; Boehm, Frederike; Øien, Nils Inge; Strelkova, Natalia; Kudrayashova, Alexander; Fauchald, Per; Ollus, Victoria Marja Sofia; Ford, Jonathan; Elton, Gary (Research report; Forskningsrapport, 2024)
      The aim of the joint Norwegian/Russian ecosystem survey in the Barents Sea and adjacent waters, August-October (BESS) is to monitor the status and changes of in the Barents Sea ecosystem. The survey has since 2004 been conducted annually in the autumn, as a collaboration between the IMR in Norway and the Polar Branch of VNIRO (PINRO) in Russia. The general survey plan, tasks, and sailings routes are ...
    • Effects of resource availability and interspecific interactions on Arctic and red foxes' winter use of ungulate carrion in the Fennoscandian low-Arctic tundra 

      Lacombe, Simon; Ims, Rolf Anker; Yoccoz, Nigel Gilles; Kleiven, Eivind Flittie; Antunes Lopes Da Silva Nicolau, Pedro Guilherme; Ehrich, Dorothee (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-01)
      In the Arctic tundra, predators face recurrent periods of food scarcity and often turn to ungulate carcasses as an alternative food source. As important and localized resource patches, carrion promotes co-occurrence of different individuals, and its use by predators is likely to be affected by interspecific competition. We studied how interspecific competition and resource availability impact ...
    • Secondary production at the Barents Sea polar front in summer: contribution of different size classes of mesozooplankton 

      Gawinski, Christine; Basedow, Sünnje Linnéa; Sundfjord, Arild; Svensen, Camilla (Journal article; Tidsskriftartikkel, 2024-05-02)
      The Barents Sea polar front is characterized by high primary production following the retreat of the ice edge during spring. However, secondary production estimates of mesozooplankton across the front are scarce, despite being essential for understanding energy flow through the food web. We investigated mesozooplankton community composition and production across the Barents Sea polar front (75°-78°N) ...
    • Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav 

      Lenss, Megan; Moreau, Sebastien; Hattermann, Tore; Wiktor, Josef; Różańska, Marta; Claeys, Philippe; Brion, Natacha; Chierici, Melissa; Fransson, Agneta; Campbell, Karley Lynn (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-02)
      The existence of ice-edge phytoplankton blooms in the Southern Ocean is well described, yet direct observations of the mechanisms of phytoplankton bloom development following seasonal sea-ice melt remain scarce. This study constrains such responses using biological and biogeochemical datasets collected along a coastal-to-offshore transect that bisects the receding sea-ice zone in the Kong Håkon VII ...
    • Impact of aggregate-colonizing copepods on the biological carbon pump in a high-latitude fjord 

      Svensen, Camilla; Iversen, Morten; Norrbin, Maria Fredrika; Möller, Klas Ove; Wiedmann, Ingrid; Skardhamar, Jofrid; Barth-Jensen, Coralie Marie Christine; Kwasniewski, Slawomir; Ormanczyk, Mateusz; Dąbrowska, Anna Maria; Koski, Marja (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-29)
      Zooplankton consumption of sinking aggregates affects the quality and quantity of organic carbon exported to the deep ocean. Increasing laboratory evidence shows that small particle-associated copepods impact the flux attenuation by feeding on sinking particles, but this has not been quantified in situ. We investigated the impact of an abundant particle-colonizing copepod, Microsetella norvegica, ...
    • Machine learning applied to species occurrence and interactions: the missing link in biodiversity assessment and modelling of Antarctic plankton distribution 

      Grillo, Marco; Schiaparelli, Stefano; Durazzano, Tiziana; Guglielmo, Letterio; Granata, Antonia; Huettmann, Falk (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-25)
      Background Plankton is the essential ecological category that occupies the lower levels of aquatic trophic networks, representing a good indicator of environmental change. However, most studies deal with distribution of single species or taxa and do not take into account the complex of biological interactions of the real world that rule the ecological processes.<p> <p>Results This study focused ...
    • Seasonality in phytoplankton communities and production in three Arctic fjords across a climate gradient 

      Chitkara, Cheshtaa; Juul-Pedersen, Thomas; Krawczyk, Diana; Søreide, Janne; Vader, Anna; Gradinger, Rolf Rudolf; HS Winding, Mie; Vonnahme, Tobias R (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-28)
      Phytoplankton communities and production in Arctic fjords undergo strong seasonal variations. Phytoplankton blooms are periods with high primary production, leading to elevated algal biomass fueling higher trophic levels. Blooms are typically driven bottom-up by light and nutrient availability but may also be top-down controlled by grazing. While phytoplankton spring blooms are common across all ...
    • Tracking gonadal development in fish: An in vivo MRI study on polar cod, Boreogadus saida (Lepechin, 1774) 

      Vogt, Nicole; Wermter, Felizitas C.; Nahrgang-Berge, Jasmine Magali; Storch, Daniela; Bock, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-07)
      Magnetic resonance imaging (MRI) was applied to determine the sex of polar cod (Boreogadus saida Lepechin, 1774) (Actinopterygii: Gadidae) and to follow the gonadal development in individual animals over time. Individual unanaesthetised fish were transferred to a measurement chamber inside a preclinical 9.4 T MRI scanner and continuously perfused with aerated seawater. A screening procedure at ...
    • Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea 

      Gawinski, Christine; Daase, Malin Hildegard Elisabeth; Primicerio, Raul; Amargant I Arumi, Marti; Müller, Oliver; Wold, Anette; Ormanzcyk, Mateusz; Kwasniewski, Slawomir; Svensen, Camilla (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-27)
      The reduction of Arctic summer sea ice due to climate change can lead to increased primary production in parts of the Barents Sea if sufficient nutrients are available. Changes in the timing and magnitude of primary production may have cascading consequences for the zooplankton community and ultimately for higher trophic levels. In Arctic food webs, both small and large copepods are commonly present, ...
    • Reading tea leaves worldwide: Decoupled drivers of initial litter decomposition mass-loss rate and stabilization 

      Sarneel, Judith M.; Hefting, Mariet M.; Sandén, Taru; van den Hoogen, Johan; Routh, Devin; Adhikari, Bhupendra S.; Alatalo, Juha M.; Aleksanyan, Alla; Althuizen, Inge; Alsafran, Mohammed H S A; Atkins, Jeff W.; Augusto, Laurent; Aurela, Mika; Azarov, Aleksej V.; Barrio, Isabel C.; Beier, Claus; Bejarano, María D; Benham, Sue E.; Berg, Björn; Bezler, Nadezhda V.; Björnsdóttir, Katrín; Bolinder, Martin A.; Carbognani, Michele; Cazzolla Gatti, Roberto; Chelli, Stefano; Chistotin, Maxim V.; Christiansen, Casper Tai; Courtois, Pascal; Crowther, Thomas W.; Dechoum, Michele S.; Djukic, Ika; Duddigan, Sarah; Egerton-Warburton, Louise M.; Fanin, Nicolas; Fantappiè, Maria; Fares, Silvano; Fernandes, Geraldo W.; Filippova, Nina V.; Fliessbach, Andreas; Fuentes, David; Godoy, Roberto; Grünwald, Thomas; Guzmán, Gema; Hawes, Joseph; He, Yue; Hero, Jean-Marc; Hess, Laura L.; Hogendoorn, Katja; Høye, Toke T.; Jans, Wilma W P; Jónsdóttir, Ingibjörg S; Keller, Sabina; Kepfer-Rojas, Sebastian; Kuz'menko, Natalya N.; Larsen, Klaus S.; Laudon, Hjalmar; Lembrechts, Jonas J.; Li, Junhui; Limousin, Jean-Marc; Lukin, Sergey M.; Marques, Renato; Marín, César; McDaniel, Marshall D.; Meek, Qi; Merzlaya, Genrietta E.; Michelsen, Anders; Montagnani, Leonardo; Mueller, Peter; Murugan, Rajasekaran; Myers-Smith, Isla H.; Nolte, Stefanie; Ochoa-Hueso, Raúl; Okafor, Bernard N.; Okorkov, Vladimir V.; Onipchenko, Vladimir G.; Orozco, María C; Parkhurst, Tina; Peres, Carlos A.; Petit Bon, Matteo; Petraglia, Alessandro; Pingel, Martin; Rebmann, Corinna; Scheffers, Brett R.; Schmidt, Inger; Scholes, Mary C.; Sheffer, Efrat; Shevtsova, Lyudmila K.; Smith, Stuart; Sofo, Adriano; Stevenson, Pablo R.; Strouhalová, Barbora; Sundsdal, Anders; Sühs, Rafael B.; Tamene, Gebretsadik; Thomas, Haydn J D; Tolunay, Duygu; Tomaselli, Marcello; Tresch, Simon; Tucker, Dominique L.; Ulyshen, Michael D.; Valdecantos, Alejandro; Vandvik, Vigdis; Vanguelova, Elena I.; Verheyen, Kris; Wang, Xuhui; Yahdjian, Laura; Yumashev, Xaris S.; Keuskamp, Joost A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-07)
      The breakdown of plant material fuels soil functioning and biodiversity. Currently, process understanding of global decomposition patterns and the drivers of such patterns are hampered by the lack of coherent large-scale datasets. We buried 36,000 individual litterbags (tea bags) worldwide and found an overall negative correlation between initial mass-loss rates and stabilization factors of plant-derived ...
    • The increase of an allelopathic and unpalatable plant undermines reindeer pasture quality and current management in the Norwegian tundra 

      Tuomi, Maria Wilhelmina; Utsi, Tove Hilde Ågnes; Yoccoz, Nigel Gilles; Armstrong, Claire W.; Gonzalez, Victoria; Hagen, Snorre; Jonsdottir, Inga-Svala; Pugnaire, Francisco I.; Shea, Katriona; Wardle, David A.; Zielosko, Sophia Theresa; Braathen, Kari Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-03)
      Ongoing Arctic greening can increase productivity and reindeer pasture quality in the tundra. However, greening may also entail proliferation of unpalatable species, with consequences for pastoral socialecological systems. Here we show extensive greening across 20 reindeer districts in Norway between 2003 and 2020, which has reduced pasture diversity. The allelopathic, evergreen dwarf-shrub crowberry ...