Viser treff 161-180 av 1914

    • A semi-automatic workflow to process images from small mammal camera traps 

      Böhner, Hanna; Kleiven, Eivind Flittie; Ims, Rolf Anker; Soininen, Eeva M (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-05)
      Camera traps have become popular for monitoring biodiversity, but the huge amounts of image data that arise from camera trap monitoring represent a challenge and artificial intelligence is increasingly used to automatically classify large image data sets. However, it is still challenging to combine automatic classification with other steps and tools needed for efficient, quality-assured and adaptive ...
    • A retrospective investigation of feather corticosterone in a highly contaminated white-tailed eagle (Haliaeetus albicilla) population 

      Hansen, Elisabeth; Sun, Jiachen; Björn, Helander; Bustnes, Jan Ove; Eulaers, Igor; Jaspers, Veerle Leontina B; Covaci, Adrian; Eens, Marcel; Bourgeon, Sophie (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-16)
      Exposure to persistent organic pollutants (POPs), such as organochlorines (OCs) and polybrominated diphenyl ethers (PBDEs), is associated with adverse health effects in wildlife. Many POPs have been banned and consequently their environmental concentrations have declined. To assess both temporal trends of POPs and their detrimental impacts, raptors are extensively used as biomonitors due to their ...
    • Spatiotemporal distribution of Arctic herbivores in spring: Potential for competition? 

      Grimsby, Anna Caroline; Pedersen, Åshild Ønvik; Ehrich, Dorothee; Mosbacher, Jesper Bruun; Garfelt Paulsen, Ingrid Marie; Brockmann, Frida Kristine; Ravolainen, Virve (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-23)
      Biotic interactions are important to the structure and dynamics of food webs and may affect the spatial and temporal distribution of species. In the Arctic, spring snow-cover limits food availability at a critical time for herbivores, potentially leading to resource competition. This study investigates the potential for competition over forage resources during spring in a high-Arctic herbivore ...
    • Life-cycle analysis of an endangered migratory goose to assess the impact of conservation actions on population recovery 

      marolla, Filippo; Aarvak, Tomas; Hamel, Sandra; Ims, Rolf Anker; Kéry, Marc; Mellard, Jarad; Nater, Chloé Rebecca; Schaub, Michael; Vougioukalou, Manolia; Yoccoz, Nigel; Øien, Ingar Jostein (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)
      Evaluating the effectiveness of conservation actions is challenging for migratory species because a population can be impacted anywhere along its route. Conservation actions for the critically endangered Fennoscandian lesser white-fronted goose population include culling of red foxes in the breeding area and habitat improvements and reduction of illegal hunting in the non-breeding areas. One goal ...
    • Home-field advantage effects in litter decomposition is largely linked to litter quality 

      Pugnaire, Francisco I.; Aares, Karoline Helene; Alifriqui, Mohamed; Bråthen, Kari Anne; Kindler, Christian; Schöb, Christian; Manrique, Esteban (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-03)
      Climate change and associated environmental alterations affect plant communities, potentially decoupling links between plants and their associated soil microbial communities. This may in turn affect processes like litter decomposition, an important function that controls nutrient and carbon cycling as well as many other ecosystem processes. Microbial decomposers have been proposed to specialize, ...
    • Tracing basal resource use across sea-ice, pelagic, and benthic habitats in the early Arctic spring food web with essential amino acid carbon isotopes 

      Vane, Kim; Cobain, Matthew R. D.; Trueman, Clive N.; Vonnahme, Tobias R.; Rokitta, Sebastian; Polunin, Nicholas V. C.; Flores, Hauke (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-09)
      A rapidly warming Arctic Ocean and associated sea-ice decline is resulting in changing sea-ice protist communities, affecting productivity of under-ice, pelagic, and benthic fauna. Quantifying such effects is hampered by a lack of biomarkers suitable for tracing specific basal resources (primary producers and microorganisms) through food webs. We investigate the potential of δ<sup>13</sup>C values ...
    • Isotopic turnover of polar cod (Boreogadus saida) muscle determined through a controlled feeding experiment 

      Ziegler, Amanda; Bluhm, Bodil; Renaud, Paul Eric; Jørgensen, Lis Lindal (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-30)
      Polar cod (Boreogadus saida) is an important trophic link within Arctic marine food webs and is likely to experience diet shifts in response to climate change. One important tool for assessing organism diet is bulk stable isotope analysis. However, key parameters necessary for interpreting the temporal context of stable isotope values are lacking, especially for Arctic species. This study provides ...
    • Evidence of separate influence of moon and sun on light synchronization of mussel's daily rhythm during the polar night 

      Tran, Damien; Andrade Rodriguez, Hector Antonio; Camus, Lionel; Leopold, Peter; Ballantine, Carl; Berge, Jørgen; Durier, Guillaume; Sow, Mohamedou; Ciret, Pierre (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-09)
      Marine organisms living at high latitudes are faced with a light climate that undergoes drastic annual changes, especially during the polar night (PN) when the sun remains below the horizon for months. This raises the question of a possible synchronization and entrainment of biological rhythms under the governance of light at very low intensities. We analyzed the rhythms of the mussel <i>Mytilus</i> ...
    • Reduced efficiency of pelagic–benthic coupling in the Arctic deep sea during lower ice cover 

      Zhulay, Irina; Iken, Katrin; Renaud, Paul Eric; Kosobokova, Ksenia; Bluhm, Bodil (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-25)
      Pelagic–benthic coupling describes the connection between surface-water production and seafloor habitats via energy, nutrient and mass exchange. Massive ice loss and warming in the poorly studied Arctic Chukchi Borderland are hypothesized to affect this coupling. The strength of pelagic–benthic coupling was compared between 2 years varying in climate settings, 2005 and 2016, based on δ<sup>13</sup>C and ...
    • Seasonal plankton dynamics in Kongsfjorden during two years of contrasting environmental conditions 

      Assmy, Philipp; Kvernvik, Ane Cecilie; Hop, Haakon; Hoppe, Clara J.M.; Chierici, Melissa; David T., Divya; Duarte, Pedro; Fransson, Agneta; García, Laura M.; Patuła, Weronika; Kwaśniewski, Sławomir; Maturilli, Marion; Pavlova, Olga; Tatarek, Agnieszka; Wiktor, Jozef M; Wold, Anette; Wolf, Klara K.E.; Bailey, Allison Michelle (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-24)
      Seasonal plankton time-series data are presented from Kongsfjorden from two years with contrasting environmental conditions. Kongsfjorden (west coast of Spitsbergen – 79°N) integrates inputs from Atlantic and Arctic waters, and glacier run-off, and is thus a prime location to study impacts on ecosystem dynamics of key environmental drivers that are relevant across the Arctic. Despite extensive ...
    • Impact of Microsetella norvegica on carbon flux attenuation and as a secondary producer during the polar night in the subarctic Porsangerfjord 

      Mooney, Benjamin Paul; Iversen, Morten Hvitfeldt; Norrbin, Fredrika (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-13)
      It is known that Microsetella norvegica feed on phytoplankton and provide an important link to higher trophic levels in Arctic fjords, such as fish sprat (Sprattus sprattus) and three-spined stickleback (Gasterosteus aculeatus). It has recently been suggested that M. norvegica may also contribute substantially to carbon flux attenuation during periods of high abundance. However, we still know very ...
    • Under-ice observations by trawls and multi-frequency acoustics in the Central Arctic Ocean reveals abundance and composition of pelagic fauna 

      Ingvaldsen, Randi Brunvær; Eriksen, Elena; Gjøsæter, Harald; Engås, Arill; Schuppe, Birte Katarina; Assmann, Karen; Cannaby, Heather Anne; Dalpadado, Padmini; Bluhm, Bodil (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-18)
      The rapid ongoing changes in the Central Arctic Ocean call for baseline information on the pelagic fauna. However, sampling for motile organisms which easily escape vertically towed nets is challenging. Here, we report the species composition and catch weight of pelagic fishes and larger zooplankton from 12 trawl hauls conducted in ice covered waters in the Central Arctic Ocean beyond the continental ...
    • A Dynamic Occupancy Model for Interacting Species with Two Spatial Scales 

      Kleiven, Eivind Flittie; Barraquand, Frédéric; Gimenez, Olivier; Henden, John-André; Ims, Rolf Anker; Soininen, Eeva M; Yoccoz, Nigel (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-10)
      Occupancy models have been extended to account for either multiple spatial scales or species interactions in a dynamic setting. However, as interacting species (e.g., predators and prey) often operate at different spatial scales, including nested spatial structure might be especially relevant to models of interacting species. Here we bridge these two model frameworks by developing a multi-scale, ...
    • Photoperiod and dietary treatment in freshwater modulate the short-term intestinal response to seawater in Atlantic salmon (Salmo salar) 

      Gaetano, Pasqualina; Duarte, Vilma; Striberny, Anja; Hazlerigg, David; Jørgensen, Even Hjalmar; Campinho, Marco A.; Fuentes, Juan (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-02)
      Stimulation and timing of smoltification are essential for successful Atlantic salmon (Salmo salar) aquaculture. This study investigated intestinal responses during dietary and photoperiod manipulation in freshwater (FW) and after a subsequent seven days residence in seawater (SW). “Small” and “large” Atlantic salmon parr (~40 g and ~ 130 g respectively) were treated in FW for 12 weeks and ...
    • The Missing Link in the Genesis of the Lower Paleozoic Copper Deposits of the Anti-Atlas (Morocco): The Late Triassic Central Atlantic Magmatic Province Event 

      Ouchchen, Mohammed; Abia, El Hassan; Soulaimani, Abderrahmane; Abioui, Mohamed; Lutz, Brandon; Benssaou, Mohammed; Abdelrahman, Kamal; Abu-Alam, Tamer; Echogdali, Fatima Zahra; Boutaleb, Said (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-30)
      Copper mineralization in the Lower Paleozoic sedimentary cover of the Anti-Atlas (Morocco) is continually being revised not only to improve its mining capacity, but also to determine its origin, which remains a matter of debate. As evidenced by the various models proposed, the related research is fragmented, localized, and confusing. The origin of the Anti-Atlas Lower Paleozoic copper mineralization ...
    • Sensitivity of bipartite network analyses to incomplete sampling and taxonomic uncertainty 

      Llopis-Belenguer, Cristina; Balbuena, Juan Antonio; Costa, Isabel Blasco; Karvonen, Anssi; Sarabeev, Volodimir; Jokela, Jukka (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-23)
      Bipartite network analysis is a powerful tool to study the processes structuring interactions in ecological communities. In applying the method, it is assumed that the sampled interactions provide an accurate representation of the actual community. However, acquiring a representative sample may be difficult as not all species are equally abundant or easily identifiable. Two potential sampling ...
    • Snowmelt contribution to Arctic first-year ice ridge mass balance and rapid consolidation during summer melt 

      Lange, Benjamin A.; Salganik, Evgenii; Macfarlane, Amy; Schneebeli, Martin; Høyland, Knut Vilhelm; Gardner, Jessie; Müller, Oliver; Divine, Dmitry; Kohlbach, Doreen; Katlein, Christian; Granskog, Mats (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-29)
      An assessment of potential groundwater areas in the Ifni basin, located in the western AntiAtlas range of Morocco, was conducted based on a multicriteria analytical approach that integrated a set of geomorphological and hydroclimatic factors influencing the availability of this resource. This approach involved the use of geographic information systems (GIS) and hierarchical analytical process ...
    • Delineation of Groundwater Potential Area using an AHP, Remote Sensing, and GIS Techniques in the Ifni Basin, Western Anti-Atlas, Morocco 

      Ikirri, Mustapha; Boutaleb, Said; Ibraheem, Ismael M.; Abioui, Mohamed; Echogdali, Fatima Zahra; Abdelrahman, Kamal; Id-Belqas, Mouna; Abu-Alam, Tamer; El Ayady, Hasna; Essoussi, Sara; Faik, Farid (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-06)
      An assessment of potential groundwater areas in the Ifni basin, located in the western AntiAtlas range of Morocco, was conducted based on a multicriteria analytical approach that integrated a set of geomorphological and hydroclimatic factors influencing the availability of this resource. This approach involved the use of geographic information systems (GIS) and hierarchical analytical process ...
    • Behaviour and habitat use of first-time migrant Arctic charr: novel insights from a subarctic marine area 

      Nordli, Eivind; Strøm, John Fredrik; Bøhn, Thomas; Thorstad, Eva Bonsak; Serra Llinares, Rosa Maria; Nilsen, Rune; Bjørn, Pål Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-13)
      Anadromous Arctic charr Salvelinus alpinus is a cold-adapted salmonid that is vulnerable to climate warming and anthropogenic activities including salmon farming, hydropower regulation, and pollution, which poses a multiple-stressor scenario that influences or threatens populations. We studied the horizontal and vertical behaviour of Arctic charr tagged with acoustic transmitters (n = 45, mean ...
    • Composition of Sugars, Organic Acids, Phenolic Compounds, and Volatile Organic Compounds in Lingonberries (Vaccinium vitis-idaea L.) at Five Ripening Stages 

      Amundsen, Mathias; Hykkerud, Anne Linn; Kelanne, Niina; Tuominen, Sanni; Schmidt, Gesine; Laaksonen, Oskar; Yang, Baoru; Martinussen, Inger; Jaakola, Laura; Aaby, Kjersti (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-26)
      Wild lingonberries are a traditional source of food in the Nordic countries and an important contributor to economic activity of non-wood forest products in the region. Lingonberries are a rich source of bioactive compounds and can be a valuable contributor to a healthy diet. However, there are few studies available on how the bioactive compounds in lingonberries develop as they ripen. In this ...