Blar i forfatter "Lydersen, Christian"

Viser treff 21-32 av 32

    • Niches of marine mammals in the European Arctic 

      MacKenzie, Kirsteen M.; Lydersen, Christian; Haug, Tore; Routti, Heli Anna Irmeli; Aars, Jon; Andvik, Clare Margaret; Borgå, Katrine; Fisk, A.T.; Meier, Sonnich; Biuw, Martin; Lowther, Andrew; Lindstrøm, Ulf Ove; Kovacs, Kit M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-11)
      The Arctic is warming rapidly, with concomitant sea ice losses and ecosystem changes. The animals most vulnerable to Arctic food web changes are long-lived and slow-growing such as marine mammals, which may not be able to adapt rapidly enough to respond to changes in their resource bases. To determine the current extent and sources of these resource bases, we examined isotopic and trophic niches ...

    • Occurrence of emerging brominated flame retardants and organophosphate esters in marine wildlife from the Norwegian Arctic 

      Lippold, Anna; Harju, Mikael; Aars, Jon; Blévin, Pierre; Bytingsvik, Jenny; Gabrielsen, Geir W.; Kovacs, Kit M.; Lyche, Jan Ludwig; Lydersen, Christian; Rikardsen, Audun H.; Routti, Heli Anna Irmeli (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-10)
      To understand the exposure and potential sources of emerging brominated flame retardants (EBFR) and organophosphate esters (OPEs) in marine wildlife from the Norwegian Arctic, we investigated concentrations of EBFRs in 157 tissue samples from nine species of marine vertebrates and OPEs in 34 samples from three whale species. The samples, collected from a wide range of species with contrasting ...

    • Panel-based Assessment of Ecosystem Condition of Norwegian Barents Sea Shelf Ecosystems 

      Siwertsson, Anna; Husson, Berengere; Arneberg, Per; Assmann, Karen; Assmy, Philipp; Aune, Magnus; Bogstad, Bjarte; Børsheim, Knut Yngve; Cochrane, Sabine K.J.; Daase, Malin; Fauchald, Per; Frainer, André; Fransson, Agneta; Hop, Haakon; Höffle, Hannes; Gerland, Sebastian; Ingvaldsen, Randi Brunvær; Jentoft, Sissel; Kovacs, Kit M.; Leonard, Deanna Marie; Lind, Sigrid; Lydersen, Christian; Pavlova, Olga; Peuchet, Laurene; Primicerio, Raul; Renaud, Paul Eric; Solvang, Hiroko Kato; Skaret, Georg; van der Meeren, Gro Ingleid; Wassmann, Paul; Øien, Nils Inge (Research report; Forskningsrapport, 2023-03-16)
      The System for Assessment of Ecological Condition, coordinated by the Norwegian Environment Agency, is intended to form the foundation for evidence-based assessments of the ecological condition of Norwegian terrestrial and marine ecosystems not covered by the EU Water Framework Directive. The reference condition is defined as “intact ecosystems”, i.e., a condition that is largely unimpacted by modern ...

    • Panel-based Assessment of Ecosystem Condition of Norwegian Barents Sea Shelf Ecosystems - Appendices 

      Siwertsson, Anna; Husson, Berengere; Arneberg, Per; Assmann, Karen; Assmy, Philipp; Aune, Magnus; Bogstad, Bjarte; Børsheim, Knut Yngve; Cochrane, Sabine K.J.; Daase, Malin; Fauchald, Per; Frainer, André; Fransson, Agneta; Hop, Haakon; Höffle, Hannes; Gerland, Sebastian; Ingvaldsen, Randi Brunvær; Jentoft, Sissel; Kovacs, Kit M.; Leonard, Deanna Marie; Lind, Sigrid; Lydersen, Christian; Pavlova, Olga; Peuchet, Laurene; Primicerio, Raul; Renaud, Paul Eric; Solvang, Hiroko Kato; Skaret, Georg; van der Meeren, Gro Ingleid; Wassmann, Paul; Øien, Nils Inge (Research report; Forskningsrapport, 2023-03-16)

    • Pathogen Exposure in White Whales (Delphinapterus leucas) in Svalbard, Norway 

      Nymo, Ingebjørg Helena; Siebert, Ursula; Baechlein, Christine; Postel, Alexander; Breines, Eva Marie; Lydersen, Christian; Kovacs, Kit M.; Tryland, Morten (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-29)
      The Svalbard white whale (Delphinapterus leucas) population is one of the smallest in the world, making it particularly vulnerable to challenges such as climate change and pathogens. In this study, serum samples from live captured (2001-2016) white whales from this region were investigated for influenza A virus (IAV) antibodies (Abs) (n = 27) and RNA (n = 25); morbillivirus (MV) Abs (n = 3) and RNA ...

    • The retrospective analysis of antarctic tracking data project 

      Ropert-Coudert, Yan; Van de Putte, Anton P.; Reisinger, Ryan R.; Bornemann, Horst; Charrassin, Jean-Benoî; Costa, Daniel P.; Danis, Bruno; Hückstädt, Luis A.; Jonsen, Ian D.; Lea, Mary-Anne; Thompson, David; Torres, Leigh G.; Trathan, Philip N.; Wotherspoon, Simon; Ainley, David G.; Alderman, Rachael; Andrews-Goff, Virginia; Arthur, Ben; Ballard, Grant; Bengtson, John; Bester, Marthán N; Blix, Arnoldus Schytte; Boehme, Lars; Bost, Charles-André; Boveng, Peter; Cleeland, Jaimie; Constantine, Rochelle; Crawford, Robert J. M.; Rosa, Luciano Dalla; de Bruyn, P. J. Nico; Delord, Karine; Descamps, Sébastien; Double, Mike; Emmerson, Louise; Fedak, Mike; Friedlaender, Ari; Gales, Nick; Goebel, Mike; Goetz, Kimberly T.; Guinet, Christophe; Goldsworthy, Simon D.; Harcourt, Rob; Hinke, Jefferson T.; Jerosch, Kerstin; Kato, Akiko; Kerry, Knowles R.; Kirkwood, Roger; Kooyman, Gerald L.; Kovacs, Kit M.; Lawton, Kieran; Lowther, Andrew D.; Lydersen, Christian; Lyver, Phil O’B.; Makhado, Azwianewi B.; Márquez, Maria E. I.; McDonald, Birgitte I.; McMahon, Clive R.; Muelbert, Monica; Nachtsheim, Dominik; Nicholls, Keith W.; Nordøy, Erling S.; Olmastroni, Silvia; Phillips, Richard A.; Pistorius, Pierre; Plötz, Joachim; Pütz, Klemens; Ratcliffe, Norman; Ryan, Peter G.; Santos, Mercedes; Southwell, Colin; Staniland, Iain; Takahashi, Akinori; Tarroux, Arnaud; Trivelpiece, Wayne; Wakefeld, Ewan; Weimerskirch, Henri; Wienecke, Barbara; Xavier, José C.; Raymond, Ben; Hindell, Mark A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-18)
      The Retrospective Analysis of Antarctic Tracking Data (RAATD) is a Scientific Committee for Antarctic Research project led jointly by the Expert Groups on Birds and Marine Mammals and Antarctic Biodiversity Informatics, and endorsed by the Commission for the Conservation of Antarctic Marine Living Resources. RAATD consolidated tracking data for multiple species of Antarctic meso- and top-predators ...

    • A review of the scientific knowledge of the seascape off Dronning Maud Land, Antarctica 

      Lowther, Andrew; von Quillfeldt, Cecilie; Assmy, Philipp; de Steur, Laura; Descamps, Sebastien; Divine, Dmitry V; Elvevold, Synnøve; Forwick, Matthias; Fransson, Agneta; Fraser, Alexander; Gerland, Sebastian; Granskog, Mats A.; Hallanger, Ingeborg G.; Hattermann, Tore; Itkin, Mikhail; Hop, Haakon; Husum, Katrine; Kovacs, Kit M.; Lydersen, Christian; Matsuoka, Kenichi; Miettinen, Arto; Moholdt, Geir; Moreau, Sebastien; Myhre, Per Inge; Orme, Lisa; Pavlova, Olga; Tandberg, Anne Helene S. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-29)
      Despite the exclusion of the Southern Ocean from assessments of progress towards achieving the Convention on Biological Diversity (CBD) Strategic Plan, the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) has taken on the mantle of progressing eforts to achieve it. Within the CBD, Aichi Target 11 represents an agreed commitment to protect 10% of the global coastal and ...

    • Ringed seal (Pusa hispida) diet on the west coast of Spitsbergen, Svalbard, Norway: during a time of ecosystem change 

      Bengtsson, Oskar; Lydersen, Christian; Kovacs, Kit M.; Lindstrøm, Ulf (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-13)
      Global warming is causing Atlantification of water masses and concomitant changes in food webs in the Barents Sea region. To determine whether changes that have been documented at lower trophic levels are impacting the diet of ringed seals (<i>Pusa hispida</i>) gastrointestinal tracts (GITs) from 99 coastal-feeding ringed seals, collected in western Spitsbergen, Svalbard, were analysed via identification ...

    • Seasonal, oceanographic and atmospheric drivers of diving behaviour in a temperate seal species living in the high arctic 

      Blanchet, Marie-Anne Ermeline; Lydersen, Christian; Ims, Rolf Anker; Kovacs, Kit (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-07-21)
      The harbour seal (Phoca vitulina) population in Svalbard marks the northernmost limit of the species’ range. This small population experiences environmental extremes in sea and air temperatures, sea ice cover and also in light regime for this normally temperate species. This study deployed Conductivity Temperature Depth Satellite Relay Data Loggers (CTDSRDLs) on 30 adult and juvenile harbour ...

    • Serum biochemistry and haematology in wild and captive bearded seals (Erignathus barbatus) from Svalbard, Norway 

      Tryland, Morten; Lydersen, Christian; Kovacs, Kit Maureen; Rafter, Espen; Thoresen, Stein Istre (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-26)
      Background - Health assessment of seals in captivity include haematology and serum biochemistry measurements. Because such parameters differ between species, it is crucial to have species-specific reference values for the interpretation of clinical samples. Furthermore, differences in nutrition and environment, life cycles as well as seasonal/annual cycles and varying physiological conditions can ...

    • Strong and lasting impacts of past global warming on baleen whales and their prey 

      Cabrera, Andrea A.; Schall, Elena; Berube, Martine; Anderwald, Pia; Berrow, Simon; Best, Peter B.; Cunha, Haydée A.; Dalla Rosa, Luciano; Dias, Carolina P.; Findlay, Kenneth P.; Haug, Tore; Heide-Jørgensen, Mads-Peter; Hoelzel, A. Rus; Kovacs, Kit M.; Landry, Scott; Larsen, Finn; Moreira Lopes, Xenia; Lydersen, Christian; Mattila, David K.; Oosting, Tom; Pace III, Richard M.; Papetti, Chiara; Paspati, Angeliki; Pastene, Luis A.; Prieto, Rui; Ramp, Christian; Robbins, Jooke; Sears, Richard; Secchi, Eduardo; Silva, Monica A.; Simon, Malene; Vikingsson, Gísli A.; Wiig, Øystein; Palsbøll, Per J.; Øien, Nils; Bachmann, Lutz; Clapham, Phillip J. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-02)
      Global warming is affecting the population dynamics and trophic interactions across a wide range of ecosystems and habitats. Translating these real-time effects into their long-term consequences remains a challenge. The rapid and extreme warming period that occurred after the Last Glacial Maximum (LGM) during the Pleistocene–Holocene transition (7–12 thousand years ago) provides an opportunity ...

    • The World's Northernmost Harbour Seal Population - How Many Are There? 

      Merkel, Benjamin; Lydersen, Christian; Yoccoz, Nigel; Kovacs, Kit (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      This study presents the first abundance estimate for the world’s northernmost harbour seal (Phoca vitulina) population, which resides in Svalbard, Norway, based on three digital stereoscopic photographic surveys conducted in 2009 and 2010. The counts from these high resolution 3D images were combined with a novel method for estimating correction factors for animals that were in the water at the ...