• Observations of a White-tailed Eagle incubating eggs of a Greylag goose 

      Jacobsen, Karl-Otto; Sexton, David (Others, 2023)
      Interspecific takeovers of nests are thought to be rare in birds. A female White-tailed Eagle Haliaeetus albicilla was observed incubating a nest of a Greylag Goose Anser anser with five eggs at Reinøya, Troms County, ...
    • Occupancy versus colonization–extinction models for projecting population trends at different spatial scales 

      Nordén, Jenni; Harrison, Philip J.; Mair, Louise; Siitonen, Juha; Lundström, Anders; Kindvall, Oskar; Snäll, Tord (Peer reviewed; Journal article, 2020)
      Understanding spatiotemporal population trends and their drivers is a key aim in population ecology. We further need to be able to predict how the dynamics and sizes of populations are affected in the long term by changing ...
    • Occupancy-based monitoring of ungulate prey species in Thailand indicates population stability, but limited recovery 

      Phumanee, Worrapan; Steinmetz, Robert; Phoonjampa, Rungnapa; Bejraburnin, Thawatchai; Grainger, Matthew; Savini, Tomaso (Peer reviewed; Journal article, 2020)
      Longitudinal studies of wildlife are urgently needed in South-East Asia to understand population responses to the high poaching pressure that characterizes this region. We monitored population trends and habitat use of ...
    • Occurrence and seasonality of Gyrodactylus salaris and G. salmonis (Monogenea) on Arctic char (Salvelinus alpinus (L.)) in the Fustvatnet lake, Northern Norway 

      Mo, Tor Atle; Hansen, Haakon; Hytterød, Sigurd (Peer reviewed; Journal article, 2023)
      Gyrodactylus spp. (Monogenea) were found on 16.9% (233 out of 1376) Arctic char, Salvelinus alpinus (L.), sampled from September 2010 to October 2011 in the Fustvatnet lake, Northern Norway. Two species were identified: ...
    • Occurrence of the European eel in lakes in the northern part of its distribution area is limited to low-altitude coastal areas, likely due to topographical conditions 

      Foldvik, Anders; Ulvan, Eva M.; Thorstad, Eva B.; Hesthagen, Trygve (Peer reviewed; Journal article, 2019)
      With the decline of the European eel, protection measures in all parts of the eel’s distribution area may be increasingly important. Norway has a vast coastline (58°–71°N), but the distribution of eel has been largely ...
    • 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 ...
    • Ocean currents as a potential dispersal pathway for Antarctica’s most persistent non-native terrestrial insect 

      Bartlett, Jesamine; Convey, Peter; Hughes, K.A.; Thorpe, S.E.; Hayward, S.A.L. (Peer reviewed; Journal article, 2021)
      The non-native midge Eretmoptera murphyi is Antarctica’s most persistent non-native insect and is known to impact the terrestrial ecosystems. It inhabits by considerably increasing litter turnover and availability of soil ...
    • Ocean predation and mortality of adult Atlantic salmon 

      Strøm, John Fredrik; Rikardsen, Audun; Campana, Steven E.; Righton, David; Carr, Jonathan; Aarestrup, Kim; Stokesbury, Michael J.W.; Gargan, Patrick; Caballero Javierre, Pablo; Thorstad, Eva B. (Peer reviewed; Journal article, 2019)
    • Ocean-wide drivers of migration strategies and their influence on population breeding performance in a declining seabird 

      Fayet, Annette L.; Freeman, Robin; Anker-Nilssen, Tycho; Diamond, Antony; Erikstad, Kjell E; Fifield, Dave; Fitzsimmons, Michelle G; Hansen, Erpur Snær; Harris, Mike P.; Jessopp, Mark; Kouwenberg, Amy-Lee; Kress, Steve; Mowat, Stephen; Perrins, Chris M.; Petersen, Aevar; Petersen, Ib K.; Reiertsen, Tone; Robertson, Gregory J.; Shannon, Paula; Sigurðsson, Ingvar A.; Shoji, Akiko; Wanless, Sarah; Guilford, Tim (Journal article; Peer reviewed, 2017)
      Which factors shape animals’ migration movements across large geographical scales, how different migratory strategies emerge between populations, and how these may affect population dynamics are central questions in ...
    • Offshore oil rigs – a breeding refuge for Norwegian Black-legged Kittiwakes Rissa tridactyla? 

      Christensen-Dalsgaard, Signe; Langset, Magdalene; Anker-Nilssen, Tycho (Peer reviewed; Journal article, 2020)
      In recent decades, the population of Black-legged Kittiwake Rissa tridactyla has declined substantially in most parts of the North Atlantic. Concurrently, there has been an increased urbanisation of the species, with ...
    • Omfattende spredning og bekjempelse av gjedde i Trøndelag 

      Hesthagen, Trygve H.; Rikstad, Anton; Adolfsen, Pål; Sandlund, Odd Terje; Bardal, Helge; Bergan, Morten Andre; Berger, Hans Mack; Finstad, Anders Gravbrøt; Olsen, Kay-Arne; Nøst, Terje; Sandodden, Roar; Sivertsgård, Rolf; Slettom, Lars (Journal article, 2020)
      I Trøndelag er gjedda naturlig utbredt bare i Murusjøen i Muruelvvassdraget i nordøst og i noen lokaliteter i Trysilelvvassdraget i sør. Helt siden middelalderen har mennesker spredt gjedde i fylket, men spesielt i løpet ...
    • On fitness and partial migration in a large herbivore – migratory moose have higher reproductive performance than residents 

      Rolandsen, Christer Moe; Solberg, Erling Johan; Sæther, Bernt-Erik; Van Moorter, Bram; Herfindal, Ivar; Bjørneraas, Kari (Journal article; Peer reviewed, 2016)
      Partially migratory populations comprise both resident and migratory individuals. Th ese tactics may coexist if their demographic contribution to future generations (i.e. fitness) are equal or vary temporally with environmental ...
    • On some Entoloma species (Tricholomatinae, Basidiomycota) little known or new to Norway 

      Brandrud, Tor Erik; Bendiksen, Egil; Jordal, John Bjarne; Weholt, Øyvind; Dima, Bálint; Morozova, Olga; Noordeloos, Machiel E. (Journal article, 2020)
      This is the second paper reporting major results from the Norwegian Entoloma project 2015- 2017. Here we present species that are new to Norway or little known, from the following smaller clades: Caeruleopolitum, Claudopus, ...
    • On the relevance of animal behavior to the management and conservation of fishes and fisheries 

      Cooke, Steven J.; Auld, Heather L.; Birnie-Gauvin, Kim; Elvidge, Chris K.; Piczak, Morgan L.; Twardek, William M.; Raby, Graham D.; Brownscombe, Jacob W.; Midwood, Jonathan D.; Lennox, Robert; Madliger, Christine; Wilson, Alexander D. M.; Binder, Thomas R.; Schreck, Carl B.; McLaughlin, Robert L.; Grant, James; Muir, Andrew M. (Peer reviewed; Journal article, 2022)
      There are many syntheses on the role of animal behavior in understanding and mitigating conservation threats for wildlife. That body of work has inspired the development of a new discipline called conservation behavior. ...
    • One Hundred Pressing Questions on the Future of Global Fish Migration Science, Conservation, and Policy 

      Lennox, Robert J.; Paukert, Craig P.; Aarestrup, Kim; Auger-Méthé, Marie; Baumgartner, Lee; Birnie-Gauvin, Kim; Bøe, Kristin; Brink, Kerry; Brownscombe, Jacob W.; Chen, Yushun; Davidsen, Jan Grimsrud; Eliason, Erika J.; Filous, Alexander; Gillanders, Bronwyn M.; Helland, Ingeborg Palm; Horodysky, Andrij Z.; Januchowski-Hartley, Stephanie R.; Lowerre-Barbieri, Susan K.; Lucas, Martyn C.; Martins, Eduardo G.; Murchie, Karen J.; Pompeu, Paulo S.; Power, Michael; Raghavan, Rajeev; Rahel, Frank J.; Secor, David; Thiem, Jason D.; Thorstad, Eva Bonsak; Ueda, Hiroshi; Whoriskey, Frederick G.; Cooke, Steven J. (Journal article; Peer reviewed, 2019)
      Migration is a widespread but highly diverse component of many animal life histories. Fish migrate throughout the world’s oceans, within lakes and rivers, and between the two realms, transporting matter, energy, and other ...
    • Ongoing niche differentiation under high gene flow in a polymorphic brackish water threespine stickleback (Gasterosteus aculeatus) population 

      Østbye, Kjartan; Taugbøl, Annette; Ravinet, Mark; Harrod, Chris; Pettersen, Ruben Alexander; Bernatchez, Louis (Journal article; Peer reviewed, 2018)
      Background: Marine threespine sticklebacks colonized and adapted to brackish and freshwater environments since the last Pleistocene glacial. Throughout the Holarctic, three lateral plate morphs are observed; the low, partial ...
    • Open Access Sympatric Atlantic puffins and razorbills show contrasting responses to adverse marine conditions during winter foraging within the North Sea 

      St.John Glew, Katie; Wanless, Sarah; Harris, Michael P.; Daunt, Francis; Erikstad, Kjell Einar; Strøm, Hallvard; Speakman, John R.; Kürten, Benjamin; Trueman, Clive N. (Movement Ecology;, Peer reviewed; Journal article, 2019)
      Background: Natural environments are dynamic systems with conditions varying across years. Higher trophic Level consumers may respond to changes in the distribution and quality of available prey by moving to locate New ...
    • OpenStreetMap history for intrinsic quality assessment: Is OSM up-to-date? 

      Minghini, Marco; Frassinelli, Francesco (Peer reviewed; Journal article, 2019)
      OpenStreetMap (OSM) is a well-known crowdsourcing project which aims to create a geospatial database of the whole world. Intrinsic approaches based on the analysis of the history of data, i.e. its evolution over time, have ...
    • Operationalising ecosystem service assessment in Bayesian Belief Networks: experiences within the OpenNESS project 

      Smith, Ron I.; Barton, David Nicholas; Dick, Jan; Haines-Young, Roy; Madsen, Anders L.; Rusch, Graciela; Termansen, Mette; Woods, Helen; Carvalho, Laurence; Giucă, Relu Constantin; Luque, Sandra; Odee, David; Rusch, Veronica E.; Saarikoski, Heli; Adamescu, Cristian Mihai; Dunford, Robert; Ochieng, John; Gonzalez-Redino, Julen; Stange, Erik; Vădineanuh, Angheluță; Verweijq, Peter; Vikström, Suvi (Journal article; Peer reviewed, 2017)
      Nine Bayesian Belief Networks (BBNs) were developed within the OpenNESS project specifically for modelling ecosystem services for case study applications. The novelty of the method, its ability to explore problems, to ...
    • 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 ...