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norskBlar i forfatter Artikler, rapporter og annet (UB) "Berge, Jørgen"
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Artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 m depth
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-05)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 behaviours, including predator-prey interactions. With a changing climate and increased human activities in the Arctic, such natural light sources will in many places be masked by ... -
Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-23)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 restricting those movements. Continuous darkness during the Arctic polar night has been suggested to impair foraging in visually searching boreal fish and may thus limit their northward ... -
Fatty acid composition of the postlarval daubed shanny (Leptoclinus maculatus) during the polar night
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-23)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 special interest is the composition of the lipid sac—a unique feature not found in other Arctic fishes. Analysis of the fatty acid content of major classes of lipids as membrane—total ... -
Impacts of artificial light at night in marine ecosystems—A review
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-18)The globally widespread adoption of Artificial Light at Night (ALAN) began in the mid-20th century. Yet, it is only in the last decade that a renewed research focus has emerged into its impacts on ecological and biological processes in the marine environment that are guided by natural intensities, moon phase, natural light and dark cycles and daily light spectra alterations. The field has diversified ... -
Light in the Polar Night
(Chapter; Bokkapittel, 2020)How much light isa vailable for biological processes during Polar Night? This question appears simple enough. But the reality is that conventional light sen- sors for measuring visible light (~350 to ~700 nm) have not been sensitive enough to answer it. Beyond this technical challenge, “light” is a general term that must be qualified in terms of “light climate” before it has meaning for biological ... -
Night Matters—Why the Interdisciplinary Field of “Night Studies” Is Needed
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-10)The night has historically been neglected in both disciplinary and interdisciplinary research. To some extent, this is not surprising, given the diurnal bias of human researchers and the difficulty of performing work at night. The night is, however, a critical element of biological, chemical, physical, and social systems on Earth. Moreover, research into social issues such as inequality, demographic ... -
Ontogenetic changes in the body structure of the Arctic fish Leptoclinus maculatus
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-06)Histological studies of the ontogenetic changes in Arctic marine fishes are often fragmented and incomplete. Here we present a comprehensive histological ontogenetic analysis of the daubed shanny (<i>Leptoclinus maculatus</i>) from the Arctic, characterizing its development as it undergoes a series of changes in the organ and tissue organization, especially during the postlarvae transition from the ... -
Parasite–copepod interactions in Svalbard: diversity, host specificity, and seasonal patterns
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-24)Copepods of the genera Calanus and Pseudocalanus are important components of Arctic marine ecosystems. Despite the key roles of these zooplankters, little is known about the organisms they interact with most intimately, their parasites and symbionts. We applied metabarcode sequencing to uncover eukaryotic parasites present within these two copepod genera from three areas around the high Arctic ... -
Pinngortitaq – a place of becoming
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01)Arctic ecosystems are on the verge of changes that are unprecedented in both magnitude and velocity. We stress that statements of a changing climate and environment have ambiguous definitions in both theoretical and metaphorical senses. Inuit have embraced the idea of an environment in a process of Pinngortitaq – a place of becoming – rather than a process of changing. In this note, we accentuate ... -
Seasonal constancy (summer vs. winter) of benthic size spectra in an Arctic fjord
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-08)Size spectra are important descriptors of community structure and can indicate changes in community functioning in response to shifts in environmental conditions. There are relatively few assessments of benthic size spectra, and most are based on summer samples alone. Processes influencing size spectra, such as recruitment and predation pressure, vary seasonally, and understanding this variation is ... -
Underwater Hyperspectral Imaging of Arctic Macroalgal Habitats during the Polar Night Using a Novel Mini-ROV-UHI Portable System
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-09)We describe an Underwater Hyperspectral Imager (UHI) deployed on an instrumentcarrying platform consisting of two interconnected mini-ROVs (Remotely Operated Vehicle) for the mapping and monitoring of Arctic macroalgal habitats in Kongsfjorden (Svalbard) during the Polar Night. The mini-ROV-UHI system is easy to transport, assemble and deploy from shore, even under the dark, icy and cold conditions ... -
Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020)Isfjorden, a broad Arctic fjord in western Spitsbergen, has shown significant changes in hydrography and inflow of Atlantic Water (AW) the last decades that only recently have been observed in the Arctic Ocean north of Svalbard. Variability and trends in this fjord’s climate and circulation are therefore analysed from observational and reanalysis data during 1987 to 2017. Isfjorden experienced a ...
