• Assessing sea floor functional biodiversity and vulnerability 

      Beauchard, Olivier; Thompson, Murray S. A.; Ellingsen, Kari; Piet, Gerjan J.; Laffargue, Pascal; Soetaert, Karline (Peer reviewed; Journal article, 2023)
      The marine benthos has been largely studied through the use of response traits that characterise species vulnerability to disturbance. More limited has been the specific use of effect traits that represent other species ...
    • 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 (Peer reviewed; Journal article, 2023)
      Anadromous Arctic charr Salvelinus alpinus is a cold-adapted salmonid that is vul nerable to climate warming and anthropogenic activities including salmon farming, hydropower regulation, and pollution, which poses a ...
    • Blue mussels in western Norway have vanished where in reach of crawling predators 

      Meister, Nadja; Langbehn, Tom; Varpe, Øystein; Jørgensen, Christian (Peer reviewed; Journal article, 2023)
      Blue mussels (Mytilus spp.) are declining around the world. In western Norway, they have widely disappeared from rocky shores but still thrive on floating structures. Other refugia are cracks in rocks, exposed sites, and ...
    • Flexibility in otherwise consistent non-breeding movements of a long-distance migratory seabird, the long-tailed skua 

      van Bemmelen, Rob; Moe, Børge; Hanssen, Sveinn Are; Schmidt, Niels Martin; Hansen, Jannik; Lang, Johannes; Sittler, Benoit; Bollache, Loïc; Tulp, Ingrid; Klaassen, Raymond; Gilg, Olivier (Journal article; Peer reviewed, 2017-02-15)
      Quantifying within- and between-individual variation in animal migration strategies is a first step towards our understanding of the ability of migrants to adjust to changes in the en - vironment. We studied consistency ...
    • Forage fish abundance is a predictor of timing of breeding and hatching brood size in a coastal seabird 

      Lorentsen, Svein-Håkon; Anker-Nilssen, Tycho; Erikstad, Kjell E; Røv, Nils (Journal article; Peer reviewed, 2015)
      Current and future climate alterations might impact ecological processes like timing of breeding. We used multivariate linear models to assess the importance of food availability and climate on timing of breeding and ...
    • Habitat connectivity and intra-population structure of an estuary-dependent fishery species 

      Childs, Amber-Robyn; Cowley, Paul D.; Næsje, Tor; Bennett, Rhett H. (Journal article; Peer reviewed, 2015)
      Habitat connectivity is a fundamental component of estuary-associated fish behaviour. Understanding this is critical to understanding population dynamics and the nursery role of estuarine habitats. This study aimed to ...
    • Inter-annual variation in winter distribution affects individual seabird contamination with mercury 

      Albert, Céline; Bråthen, Vegard Sandøy; Descamps, Sebastien; Anker-Nilssen, Tycho; Cherenkov, A.; Christensen-Dalsgaard, Signe; Danielsen, Johannis; Erikstad, Kjell E.; Gavrilo, Maria; Hanssen, Sveinn Are; Helgason, Halfdan Helgi; Jonsson, Jón Einar; Kolbeinsson, Yann; Krasnov, Yuri V.; Langset, Magdalene; Lorentzen, Erlend; Olsen, Bergur; Reiertsen, Tone Kristin; Strøm, Hallvard; Systad, Geir Helge Rødli; Tertitski, G.; Thompson, P.M; Thórarinsson, Torkell Lindberg; Bustamante, P.; Moe, Børge; Fort, Jérôme (Peer reviewed; Journal article, 2021)
      Migratory seabirds are exposed to various pollutants throughout their annual cycle. Among them, mercury (Hg) is of particular concern given its large impact on animal health. Recent studies suggest that winter is a critical ...
    • Killer whale movements on the Norwegian shelf are associated with herring density 

      Vogel, Emma; Biuw, Martin; Blanchet, Marie-Anne; Jonsen, Ian D.; Mul, Evert; Johnsen, Espen; Hjøllo, Solfrid Sætre; Olsen, Morten Tange; Dietz, Rune; Rikardsen, Audun (Peer reviewed; Journal article, 2021)
      Killer whales Orcinus orca have a cosmopolitan distribution with a broad diet rang ing from fish to marine mammals. In Norway, killer whales are regularly observed feeding on overwintering Norwegian spring-spawning (NSS) ...
    • Light-level geolocators reveal spatial variations in interactions between northern fulmars and fisheries 

      Dupuis, Benjamin; Amélineau, Françoise; Tarroux, Arnaud; Bjørnstad, Oskar; Bråthen, Vegard Sandøy; Danielsen, Jóhannis; Descamps, Sebastien; Fauchald, Per; Hallgrimsson, Gunnar Thor; Hansen, Erpur Snær; Helberg, Morten; Helgason, Halfdan Helgi; Jónsson, Jón Einar; Kolbeinsson, Yann; Lorentzen, Erlend; Thompson, Paul; Thórarinsson, Thorkell Lindberg; Strøm, Hallvard (Peer reviewed; Journal article, 2021)
      Seabird−fishery interactions are a common phenomenon of conservation concern. Here, we highlight how light-level geolocators provide promising opportunities to study these interactions. By examining raw light data, it ...
    • Linking embryonic temperature with adultreproductive investment in Atlantic salmonSalmo salar 

      Jonsson, Bror; Jonsson, Nina; Finstad, Anders G. (Peer reviewed; Journal article, 2014)
      The expression of fitness-related traits, such as egg and gonad size, often varies among habitats and exhibits clinal variation along climatic and latitudinal gradients. However, the mechanisms allowing such variations ...
    • Long-term tracking of an Arctic-breeding seabird indicates high fidelity to pelagic wintering areas 

      Léandri-Breton, Don-Jean; Tarroux, Arnaud; Elliott, Kyle H.; Legagneux, Pierre; Angelier, Frédéric; Blévin, Pierre; Bråthen, Vegard Sandøy; Fauchald, Per; Goutte, Aurélie; Jouanneau, William; Tartu, Sabrina; Moe, Børge; Chastel, Olivier (Peer reviewed; Journal article, 2021)
      Site fidelity is driven by predictable resource distributions in time and space. However, intrinsic factors related to an individual’s physiology and life-history traits can contribute to consistent foraging behaviour and ...
    • Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice 

      Halttunen, Elina; Gjelland, Karl Øystein; Glover, Kevin; Johnsen, Ingrid Askeland; Serra-Llinares, Rosa-Maria; Skaala, Øystein; Nilsen, Rune; Bjørn, Pål Arne; Karlsen, Ørjan; Finstad, Bengt; Skilbrei, Ove Tommy (Journal article; Peer reviewed, 2018)
      Understanding Atlantic salmon Salmo salar post-smolt coastal migration behaviour is crucial for predicting their exposure to ecological challenges such as the parasite salmon louse Lepeophtheirus salmonis. We compared the ...
    • Moult location and diet of auks in the North Sea inferred from coupled light-based and isotope-based geolocation 

      Glew, Katie St. John; Wanless, Sarah; Harris, Michael P.; Daunt, Francis; Erikstad, Kjell E; Strøm, Hallvard; Trueman, Clive N. (Journal article; Peer reviewed, 2018)
      Many pelagic seabirds moult their feathers while at sea, which is an energetically costly behaviour. Mortality rates during moult can be high, so spatial and trophic ecology during this critical period is important for ...
    • Multi-colony tracking reveals spatio-temporal variation in carry-over effects between breeding success and winter movements in a pelagic seabird 

      Bogdanova, Maria I.; Butler, Adam; Wanless, Sarah; Moe, Børge; Anker-Nilssen, Tycho; Frederiksen, Morten; Boulinier, Thierry; Chivers, Lorraine S.; Christensen-Dalsgaard, Signe; Descamps, Sébastien; Harris, Michael P.; Newell, Mark; Olsen, Bergur; Phillips, Richard A.; Shaw, Deryk; Steen, Harald; Strøm, Hallvard; Thórarinsson, Thorkell L; Daunt, Francis (Journal article; Peer reviewed, 2017)
      Carry-over effects, whereby events in one season have consequences in subsequent seasons, have important demographic implications. Although most studies examine carry-over effects across 2 seasons in single populations, ...
    • Ocean climate and egg investment in the black-legged kittiwake Rissa tridactyla 

      Barrett, Robert T; Erikstad, Kjell E; Reiertsen, Tone (Journal article; Peer reviewed, 2017)
      Birds allocate substantial resources to their eggs during the laying period, resources also needed for other concurrent costly processes such as mate acquisition, nest building and site defence. Egg and clutch sizes may ...
    • Optimal size at seaward migration in an anadromous salmonid 

      Jonsson, Bror; Jonsson, Marius; Jonsson, Nina (Journal article; Peer reviewed, 2016)
      In this study, the probabilistic reaction norm was calculated for length at different ages of smolting before seaward migration of Atlantic salmon Salmo salar spawning in the Norwegian River Imsa. The reaction norm was ...
    • Prevailing weather conditions and dietcomposition affect chick growth and survival in the black-legged kittiwake 

      Christensen-Dalsgaard, Signe; May, Roelof Frans; Barrett, Robert; Langset, Magdalene; Sandercock, Brett; Lorentsen, Svein Håkon (Journal article; Peer reviewed, 2018)
      To identify priorities for management of seabirds during the breeding season, it is important to understand the ecological mechanisms driving chick growth and survival. In this study, we examined the effects of diet and ...
    • Relationships between isotopic ratios, body condition and breeding success in a High Arctic seabird community 

      Hovinen, Johanna Emilia Heidi; Tarroux, Arnaud; Ramirez, Francisco; Forero, Manuela; Descamps, Sébastien (Peer reviewed; Journal article, 2019)
      Predators such as seabirds are often used as bio-indicators of the marine environment. This is based on the assumption that changes in seabird populations are driven by changes in their prey. We tested this assumption in ...
    • Reproductive success in the European shag is linked to annual variation in diet and foraging trip metrics 

      Lorentsen, Svein-Håkon; Mattisson, Jenny; Christensen-Dalsgaard, Signe (Journal article, 2019)
      Seabird populations have declined worldwide, and several of the potential threats are of anthropogenic origin. To understand how changes in seabird populations relate to environmental conditions it is important to know the ...
    • Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment 

      Lorentsen, Svein Håkon; Anker-Nilssen, Tycho; Erikstad, Kjell E (Journal article; Peer reviewed, 2018)