Review
Fisheries
N. O. A. S. Jourdain, E. Fuglebakk, S. Subbey
Summary: This study examines the maturation of capelin in the Barents Sea and finds that the assumption of constant maturity at length may overestimate the proportion of maturing stock compared to gonad-based estimates. The difference in estimates varies with time and stock size, highlighting the uncertainty associated with the current harvest rule.
FISHERIES RESEARCH
(2021)
Article
Fisheries
Salah Alrabeei, Sam Subbey, Sofie Gundersen, Harald Gjoaeter
Summary: This study inferred potential spawning regions of Barents Sea capelin using alternative data sources and clustering techniques. It showed that capelin mainly spawned in the eastern part of historical spawning areas and had some westward extensions in certain years. The methodology was efficient in reproducing capelin spawning regions and approximate time windows for commencement of spawning.
FISHERIES RESEARCH
(2021)
Article
Environmental Sciences
Emma F. Vogel, Stine Skalmerud, Martin Biuw, Marie-Anne Blanchet, Lars Kleivane, Georg Skaret, Nils Oien, Audun Rikardsen
Summary: This study analysed satellite tag data from ten humpback whales in the Barents Sea to investigate how their movement and dive patterns are influenced by the distribution of capelin. The results showed that regions with high capelin density are important foraging grounds for humpback whales, emphasizing the key role of capelin in the marine ecosystem of the Barents Sea.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Fisheries
H. R. Skjoldal
Summary: Zooplankton biomass in the Barents Sea has undergone changes over four decades, with fluctuations related to the stock of Barents Sea capelin. The biomass was low in the 1980s but peaked in 1987 and 1994. In recent decades, there have been divergent trends, with high biomass in the inflowing Atlantic water and decreased biomass in the central area.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Environmental Sciences
Anjali Gopakumar, Julia Giebichenstein, Evgeniia Raskhozheva, Katrine Borga
Summary: This study quantified mercury concentrations, carbon, and nitrogen stable isotope ratios in polar cod, Atlantic cod, and capelin sampled from the North-West and North-East Barents Sea. The research found that mercury concentrations varied between species and regions, but remained below toxicity thresholds for fish health and human consumption. Atlantic cod in the North-East had the highest mercury concentrations due to its larger size, higher trophic position, and benthopelagic feeding, while polar cod in the North-East had higher mercury concentrations than in the North-West, likely due to differences in food web structure and mercury exposure.
MARINE POLLUTION BULLETIN
(2021)
Article
Environmental Sciences
Ziyi Cai, Qinglong You, Hans W. Chen, Ruonan Zhang, Deliang Chen, Jinlei Chen, Shichang Kang, Judah Cohen
Summary: In recent decades, the Barents Sea has warmed more than twice as fast as the rest of the Arctic in winter. This study reveals that enhanced clear-sky downward longwave radiation and increased total column water vapor are the main causes of the warming. Furthermore, the Barents oscillation, an atmospheric variability mode, has strongly contributed to the amplified warming through enhanced heat and moisture transport.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Bo Qu, Albert J. Gabric, Rebecca Jackson
Summary: Research shows that the Barents Sea is one of the regions most affected by climate change in the Arctic, with phytoplankton growth in the northern region closely related to the timing of sea ice melt. Under 4xCO(2) climate conditions, decreased spring sea ice and deepening of the mixed layer inhibit phytoplankton growth, leading to a decrease in DMS sea-to-air flux.
JOURNAL OF MARINE SYSTEMS
(2021)
Article
Fisheries
Geir Ottersen, Rebecca E. Holt
Summary: This study examines the impact of the spawning stock on the connection between the environment and recruitment, and its significance for the dynamics of cod populations. The findings support earlier hypotheses and provide stronger evidence for the relationship. Furthermore, the study emphasizes the importance of considering environmental status in fisheries management advice.
FISHERIES OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Kai Zhu, Wenbin Zhu, Yongchuang Shi
Summary: Fishery resources assessment is crucial for scientific management and sustainable development of fisheries. This study used length frequency data from 2016 to 2020 to estimate various indicators of the Trichiurus lepturus stock in the East China Sea. The analysis revealed overfishing and heavy fishing pressure on the stock, highlighting the need for conservation measures.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Fisheries
Cecilie Hansen, Gro van der Meeren, Harald Loeng, Morten D. Skogen
Summary: The two end-to-end ecosystem models, NORWECOM.E2E and NoBa Atlantis, were used to explore indicators from the Barents Sea Management plans, showing that the selected indicators give a good overview of the ecosystem state but lack of connection between indicators and management actions. The absence of socio-economic and economic indicators is identified as a limitation and the inclusion of these in future management plans is recommended. The evaluated indicators perform well in assessing the ecosystem, but their consistency and representativeness are highly dependent on the time and location of sampling.
ICES JOURNAL OF MARINE SCIENCE
(2021)
Article
Environmental Sciences
Jean-Christophe Raut, Kathy S. Law, Tatsuo Onishi, Nikos Daskalakis, Louis Marelle
Summary: Arctic warming and reduced sea-ice in the summer are expected to increase local shipping, especially along the Northeast Passage. This study examines the effects of shipping emissions on air pollutants and deposition fluxes over the Barents Sea. The results show that present-day shipping emissions already have substantial effects on ozone concentrations, while future changes in ozone and aerosol concentrations are also predicted. Additionally, significant enhancements in dry deposition of sulfur dioxide and wet deposition of nitrogen compounds to the Barents Sea are predicted.
ENVIRONMENTAL POLLUTION
(2022)
Article
Agriculture, Dairy & Animal Science
Alexander G. Dvoretsky, Vladimir G. Dvoretsky
Summary: New biodiversity records of echinoderms as epibionts on red king crabs in the Barents Sea provide insights into the symbiotic associations of this commercially important species. The presence of common starfish, Atlantic sea cucumber, green sea urchin, and brittle star on the invasive red king crab suggests potential ecological implications and predator-prey interactions that could benefit both species without negative effects on local populations.
Article
Biology
Vladimir G. G. Dvoretsky, Veronika V. V. Vodopianova, Aleksandra S. S. Bulavina
Summary: Phytoplankton and other algae play a vital role in aquatic food webs, converting solar energy into chemical compounds that sustain higher trophic levels. Chlorophyll a (Chl-a) is an important indicator of phytoplankton biomass and can be used to monitor changes in marine ecosystems due to environmental fluctuations. This study investigated the relationship between Chl-a and climatic factors in the Barents Sea and found that Chl-a increased over the past four decades, particularly during warm periods. High temperature and decreasing sea ice extent were associated with higher Chl-a concentrations. The study highlights the importance of temperature changes, ice extent, and global atmospheric circulation in driving spatial, seasonal, and temporal variability in Chl-a in the Arctic marine systems.
Article
Geosciences, Multidisciplinary
James L. Warner, James A. Screen, Adam A. Scaife, Anna Maidens, Jeff Knight
Summary: By manipulating the tropical climate system, this study reveals the link between tropical rainfall and Autumn Barents-Kara sea ice as well as the winter North Atlantic Oscillation. However, clear evidence of tropical influences at high latitudes is only found during the strong 1997 El Nino event.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Fisheries
Mette Skern-Mauritzen, Ulf Lindstrom, Martin Biuw, Bjarki Elvarsson, Thorvaldur Gunnlaugsson, Tore Haug, Kit M. Kovacs, Christian Lydersen, Margaret M. McBride, Bjarni Mikkelsen, Nils Oien, Gisli Vikingsson
Summary: This study evaluates prey consumption by the marine mammal community in the northeast Atlantic and compares it with fisheries removals. Results show that marine mammals consume slightly more prey than fisheries. Additionally, significant changes in mammal consumption over the last decades are likely related to historic whaling and rapid changes in high-latitude systems.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Biodiversity Conservation
Elena Eriksen, Mats Huserbraten, Harald Gjosaeter, Frode Vikebo, Jon Albretsen
Article
Oceanography
Ines Dias Bernardes, Egil Ona, Harald Gjosaeter
PROGRESS IN OCEANOGRAPHY
(2020)
Article
Fisheries
Nicolas Dupont, Joel M. Durant, Oystein Langangen, Harald Gjosaeter, Leif Christian Stige
ICES JOURNAL OF MARINE SCIENCE
(2020)
Article
Ecology
Georg Skaret, Geir Odd Johansen, Espen Johnsen, Johanna Fall, Oyvind Fiksen, Goran Englund, Per Fauchald, Harald Gjosaeter, Gavin J. Macaulay, Edda Johannesen
MARINE ECOLOGY PROGRESS SERIES
(2020)
Article
Biodiversity Conservation
Harald Gjosaeter, Mats Huserbraten, Frode Vikebo, Elena Eriksen
Article
Oceanography
Harald Gjosaeter, Randi Ingvaldsen, Jorgen S. Christiansen
PROGRESS IN OCEANOGRAPHY
(2020)
Article
Oceanography
Sebastian Menze, Randi B. Ingvaldsen, Anna Nikolopoulos, Tore Hattermann, Jon Albretsen, Harald Gjosaeter
PROGRESS IN OCEANOGRAPHY
(2020)
Review
Oceanography
Tore Haug, Martin Biuw, Harald Gjosaeter, Tor Knutsen, Ulf Lindstrom, Kirsteen M. MacKenzie, Sonnich Meier, Kjell T. Nilssen
Summary: A marine ecosystem survey conducted in September 2016 in the Arctic Ocean to the west and north of Svalbard showed that recent environmental changes have affected the diets and body condition of harp seals, with body condition slightly lower for older seals in 2016 compared to earlier samples. Polar cod and the pelagic hyperiid amphipod Themisto libellula continue to dominate the seal diet, with the absence of bottom associated species and the presence of alternative species such as Atlantic cod and blue whiting due to changes in ice edge localization.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Fisheries
Mahmood Jokar, Sam Subbey, Harald Gjosaeter
Summary: This paper models the dynamics of length-at-maturation for the Barents Sea capelin using a two-parameter logistic function, and demonstrates the three-state Markov process of stock biomass over time. The study shows that maturation intensity is higher at low stock size, and highlights the importance of understanding this relationship for stock management and sustainability.
FISHERIES RESEARCH
(2021)
Article
Biodiversity Conservation
Hiroko K. Solvang, Tore Haug, Tor Knutsen, Harald Gjosaeter, Bjarte Bogstad, Siri Hartvedt, Nils Oien, Ulf Lindstrom
Summary: Recent warming in the Barents Sea has caused changes in the distribution of zooplankton and fish, leading to a northward expansion of boreal communities. Ecosystem surveys conducted from 2014 to 2017 revealed spatial associations among rorqual species, predatory fish, and their main prey groups in Arctic Ocean waters west and north of Svalbard.
Review
Oceanography
Pauline Snoeijs-Leijonmalm, Harald Gjosaeter, Randi B. Ingvaldsen, Tor Knutsen, Rolf Korneliussen, Egil Ona, Hein Rune Skjoldal, Christian Stranne, Larry Mayer, Martin Jakobsson, Katarina Gardfeldt
Summary: The Central Arctic Ocean, a 3.3 million km(2) marine ecosystem, is currently a blind spot in terms of fish stocks due to ice cover and ice-breaking noise, making traditional methods of assessing fish stocks impossible. However, initial research suggests the presence of a possible mesopelagic fish stock in the region.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Fisheries
Salah Alrabeei, Sam Subbey, Sofie Gundersen, Harald Gjoaeter
Summary: This study inferred potential spawning regions of Barents Sea capelin using alternative data sources and clustering techniques. It showed that capelin mainly spawned in the eastern part of historical spawning areas and had some westward extensions in certain years. The methodology was efficient in reproducing capelin spawning regions and approximate time windows for commencement of spawning.
FISHERIES RESEARCH
(2021)
Article
Biology
A. Frank, S. Subbey, M. Kobras, H. Gjosaeter
Summary: This study investigates the potential regulation of capelin population collapses by food availability and time discrepancy between predator feeding and prey abundance. The results suggest that a critical time for prey availability in advance of optimal predator growth period may lead to a Hopf bifurcation in the predatory-prey system, affecting system stability. This provides mathematical evidence for the validity of the match-mismatch hypothesis and a bottom-up effect for capelin in an ecological context.
JOURNAL OF THEORETICAL BIOLOGY
(2021)
Review
Oceanography
Hein Rune Skjoldal, Elena Eriksen, Harald Gjosaeter, Oystein Skagseth, Dmitry Prozorkevich, Vidar S. Lien
Summary: This study investigated the spatial and temporal variation of 0-group fish in the Barents Sea. The results showed significant differences in length among different species, with climate variability and warming having a strong impact on 0-group length. Food availability also played a significant role.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Biology
Mats Brockstedt Olsen Huserbraten, Elena Eriksen, Harald Gjosaeter, Frode Vikebo
COMMUNICATIONS BIOLOGY
(2019)