Blar i NTNU Open på forfatter "Berge, Jørgen"
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Accounting for Uncertainties in Biodiversity Estimations: A New Methodology and Its Application to the Mesopelagic Sound Scattering Layer of the High Arctic
Herrmann, Bent; Cerbule, Kristine; Brčić, Jure; Grimaldo Vela, Eduardo Enrique; Geoffroy, Maxime; Daase, Malin; Berge, Jørgen (Peer reviewed; Journal article, 2022)Measures of biological diversity (biodiversity) are important for monitoring the state of ecosystems. Several indices and methods are used to describe biodiversity from field observations. Marine faunal biodiversity is ... -
Age class composition and growth of Atlantic cod (Gadus morhua) in the shallow water zone of Kongsfjorden, Svalbard
Brand, Markus; Spotowitz, Lisa; Mark, Felix; Berge, Jørgen; Langhelle, Erlend; Weslawski, Jan Marcin; Godiksen, Jane Aanestad; Fischer, Philipp (Peer reviewed; Journal article, 2022)Although Atlantic cod has been observed in Svalbard waters since the 1880s, knowledge about the presence in the Arctic shallow water zone is limited. The regular catch of juvenile Atlantic cod in Kongsfjorden since 2008 ... -
An ice-tethered buoy for fish and plankton research
Zolich, Artur Piotr; De La Torre, Pedro R.; Rodwell, Shane; Geoffroy, Maxime; Johnsen, Geir; Berge, Jørgen (Chapter, 2018)I.In this paper the authors present bio-acoustical icetethered platform for optical, physical and ecological sensors (POPE), i.e. an ice-tethered buoy, equipped with an AZFP scientific echosounder for fish and plankton ... -
Arctic complexity: A case study on diel vertical migration of zooplankton
Berge, Jørgen; Cottier, Finlo; Varpe, Øystein; Renaud, Paul; Falk-Petersen, Stig; Kwasniewski, Sawomir; Griffiths, Colin; Søreide, Janne; Johnsen, Geir; Aubert, Anais; Bjærke, Oda; Hovinen, Johanna Emilia Heidi; Jung-Madsen, Signe; Tveit, Martha; Markkula, Sanna (Journal article; Peer reviewed, 2014) -
Artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 m depth
Berge, Jørgen; Geoffroy, Maxime; Daase, Malin; Cottier, Finlo Robert; Priou, Pierre; Cohen, Jonathan H.; Johnsen, Geir; McKee, David; Kostakis, I; Renaud, Paul E.; Vogedes, Daniel Ludwig; Anderson, Philip J.; Last, Kim; Gauthier, Stephane (Peer reviewed; Journal article, 2020)For organisms that remain active in one of the last undisturbed and pristine dark environments on the planet—the Arctic Polar Night—the moon, stars and aurora borealis may provide important cues to guide distribution and ... -
Bearded seal (Erignathus barbatus) vocalizations across seasons and habitat types in Svalbard, Norway
Llobet, Samuel M.; Ahonen, Heidi; Lydersen, Christian; Berge, Jørgen; Ims, Rolf Anker; Kovacs, Kit M. (Peer reviewed; Journal article, 2021)Male bearded seals (Erignathus barbatus) use vocal displays to attract females and to compete with other males during the mating season. This makes it possible to monitor breeding populations of this species using passive ... -
Benthic scavenger community composition and carrion removal in Arctic and Subarctic fjords
Dunlop, Katherine Mary; Renaud, Paul Eric; Berge, Jørgen; Jones, Daniel O.B.; Harbour, Rob P.; Tandberg, Anne Helene S.; Sweetman, Andrew K. (Peer reviewed; Journal article, 2020)In high latitude coastal regions, benthic scavenger communities are largely composed of invertebrates that play a key role in the cycling of organic matter. Factors including temperature and depth can structure Arctic and ... -
Bioluminescence as an ecological factor during high Arctic polar night
Cronin, Heather; Cohen, Jonathan H.; Berge, Jørgen; Johnsen, Geir; Moline, Mark A. (Journal article; Peer reviewed, 2016)Bioluminescence commonly influences pelagic trophic interactions at mesopelagic depths. Here we characterize a vertical gradient in structure of a generally low species diversity bioluminescent community at shallower ... -
Calibration verification of an underwater hyperspectral imaging push broom instrument to measure light in absolute units and field demonstration
Schartmüller, Bernhard; McKee, David; Berge, Jørgen; Johnsen, Geir (Journal article; Peer reviewed, 2024)The push broom design of an underwater hyperspectral imaging (UHI) instrument makes it possible to measure angle-resolved spectral radiance () in a plane. We describe the characterization of a commercial UHI instrument ... -
Connections to the Deep: Deep Vertical Migrations, an Important Part of the Life Cycle of Apherusa glacialis, an Arctic Ice-Associated Amphipod
Drivdal, Magnus; Kunisch, Erin; Bluhm, Bodil; Gradinger, Rolf; Falk-Petersen, Stig; Berge, Jørgen (Peer reviewed; Journal article, 2021)Arctic sea ice contains a substantial amount of living biota of which part is lost through melt and export out of the Arctic Ocean every year. It is unclear how populations can be maintained within the Arctic Ocean. A ... -
Dense mesopelagic sound scattering layer and vertical segregation of pelagic organisms at the Arctic-Atlantic gateway during the midnight sun
Priou, Pierre; Nikolopoulos, Anna; Flores, Hauke; Gradinger, Rolf; Kunisch, Eirin; Katlein, Christian; Castellani, Giulia; Linders, Torsten Theodor; Berge, Jørgen; Fisher, Jonathan A.D.; Geoffroy, Maxime (Peer reviewed; Journal article, 2021)Changes in vertical and spatial distributions of zooplankton and small pelagic fish impact the biological carbon pump and the distribution of larger piscivorous fish and marine mammal species. However, their distribution ... -
Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters
Schartmuller, Bernhard; Anderson, Philip; Mckee, David; Connan-McGinty, Stacey; Kopec, Tomasz Piotr; Daase, Malin Hildegard Elisabeth; Johnsen, Geir; Berge, Jørgen (Journal article; Peer reviewed, 2023)The optical chain and logger (OptiCAL) is an autonomous ice-tethered observatory equipped with multiple light sensors for mapping the variation of light with depth. We describe the instrument and present an ensemble ... -
Development of a bio-optical model for the Barents Sea to quantitatively link glider and satellite observations: A bio-optical model for the Barents Sea
Kostakis, I.; Röttgers, R.; Orkney, A.; Bouman, H.A.; Porter, M.; Cottier, Finlo Robert; Berge, Jørgen; Mckee, David (Peer reviewed; Journal article, 2020)A bio-optical model for the Barents Sea is determined from a set of in situ observations of inherent optical properties (IOPs) and associated biogeochemical analyses. The bio-optical model provides a pathway to convert ... -
Diel vertical migration of Arctic zooplankton during the polar night
Berge, Jørgen; Cottier, Finlo; Last, Kim S.; Varpe, Øystein; Leu, Eva; Søreide, Janne; Eiane, Ketil; Falk-Petersen, S.; Willis, Kate; Nygård, Henrik; Vogedes, Daniel; Griffiths, Collin; Johnsen, Geir; Lorentzen, Dag Arne; Brierley, A.S. (Journal article; Peer reviewed, 2009)High-latitude environments show extreme seasonal variation in physical and biological variables. The classic paradigm of Arctic marine ecosystems holds that most biological processes slow down or cease during the polar ... -
Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night
Larsen, Lars-Henrik; Cusa, Marine Lure Joana; Eglund-Newby, Sam; Berge, Jørgen; Renaud, Paul Eric; Varpe, Øystein; Geoffroy, Maxime; Falk-Petersen, Stig (Peer reviewed; Journal article, 2023)As the climate warms, boreal fish species are expected to expand into the Arctic domain. Though water temperature is an important factor driving expansion of aquatic species, other variables may play a critical role in ... -
Eat or sleep: Availability of winter prey explains mid-winter and spring activity in an Arctic Calanus population
Hobbs, Laura; Banas, Neil S.; Cottier, Finlo Robert; Berge, Jørgen; Daase, Malin (Peer reviewed; Journal article, 2020)Copepods of the genus Calanus have adapted to high levels of seasonality in prey availability by entering a period of hibernation during winter known as diapause, but repeated observations of active Calanus spp. have been ... -
Eco-physiology of the Arctic kelp Laminaria solidungula: - using divers, Remotely Operated Vehicle and Pulse Amplitude Modulated fluorometry
Belseth, Elen (Master thesis, 2012)! -
Environmental niche overlap in sibling planktonic species Calanus finmarchicus and C. glacialis in Arctic fjords
Weydmann-Zwolicka, Agata; Cottier, Finlo Robert; Berge, Jørgen; Majaneva, Sanna; Kuklinski, Piotr; Zwolicki, Adrian (Peer reviewed; Journal article, 2022)Knowledge of environmental preferences of the key planktonic species, such as Calanus copepods in the Arctic, is crucial to understand ecosystem function and its future under climate change. Here, we assessed the environmental ... -
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 (Peer reviewed; Journal article, 2023)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 ... -
Fatty acid composition of the postlarval daubed shanny (Leptoclinus maculatus) during the polar night
Pekkoeva, Svetlana N.; Murzina, Svetlana A.; Nefedova, Zinaida A.; Falk-Pedersen, Stig; Berge, Jørgen; Lønne, Ole Jørgen; Nemova, Nina N. (Peer reviewed; Journal article, 2020)Recent discoveries of high levels of biological activity in the Arctic marine ecosystems during the polar night raise questions regarding the ecophysiology of the pelagic postlarval daubed shanny Leptoclinus maculatus. Of ...