Diet of snow crab in the Barents Sea and macrozoobenthic communities in its area of distribution

2020 ◽  
Author(s):  
Denis V Zakharov ◽  
Igor E Manushin ◽  
Tatiana B Nosova ◽  
Natalya A Strelkova ◽  
Valery A Pavlov
Keyword(s):  
Barents Sea ◽  
Benthic Communities ◽  
Stomach Contents ◽  
Snow Crab ◽  
Feeding Intensity ◽  
Novaya Zemlya Archipelago ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
The Pacific ◽  
Almost All

Abstract This article investigates the diet of the snow crab (Chionoecetes opilio) and its feeding intensity in the Barents Sea. Data show that snow crab has a diverse diet that includes almost all types of benthic invertebrates living in the Barents Sea. There are differences between the diets of females and males and of juveniles and adults. Juveniles and females typically occupy shallow areas with communities of bivalve molluscs, while males typically live deeper on slopes and depressions where polychaetes and crustaceans are the most abundant groups. Stomach contents were analysed to determine the species composition and frequency of occurrence of various benthic taxa. Consumption of food was estimated and compared with data from the Russian seas of the Pacific region. The total annual consumption of macrozoobenthos by snow crab was calculated in accordance with its current distribution in the Barents Sea. Snow crab consumes at least 30 000 tonnes of benthos annually, which amounts to 0.1–0.2% of the total macrozoobenthic biomass in the investigated area. The population of snow crab causes the largest impact on the benthic communities in the northeastern part of the Barents Sea and near the south side of the Novaya Zemlya archipelago.

scholarly journals Features of the Distribution of Chlorophyll-a Concentration along the Western Coast of the Novaya Zemlya Archipelago in Spring

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3648
Author(s):  
Pavel R. Makarevich ◽  
Veronika V. Vodopianova ◽  
Aleksandra S. Bulavina ◽  
Pavel S. Vashchenko ◽  
Tatiana G. Ishkulova
Keyword(s):  
Chlorophyll A ◽  
Barents Sea ◽  
Western Coast ◽  
Novaya Zemlya Archipelago ◽  
Chlorophyll A Concentration ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
High Concentrations ◽  
First Time ◽  
Arctic Surface

In spring 2016, the thermohaline characteristics of water masses and the distribution of chlorophyll-a concentration in the pelagic zone of the eastern part of the Barents Sea were studied. For the first time, in the conditions of an abnormally warm year and the absence of ice cover, a complex of hydrobiological works was carried out on a section crossing the Barents Sea from south to north along the western coast of the Novaya Zemlya archipelago. High concentrations of chlorophyll-a > 1 ˂ 6 mg/m3 at all stations of the transect indicate a stage of spring bloom in the successional cycle of microalgae. Significant differences in the content of chlorophyll-a in waters of various origins were revealed. The highest concentrations of chlorophyll-a corresponded to Arctic surface water (5.56 mg/m3). Slightly lower values were observed in the transformed Atlantic waters of the Novozemelskoe and Kolguevo–Pechorskoe currents (3.53 ± 0.97–3.71 ± 1.04 mg/m3), and the lowest was in the Barents waters (1.24 ± 0.84–1.45 ± 1.13 mg/m3).

scholarly journals Ice gouging on the arctic shelf of Russia

2019 ◽  
Vol 59 (3) ◽  
pp. 466-468
Author(s):  
S. L. Nikiforov ◽  
R. A. Ananiev ◽  
N. V. Libina ◽  
N. N. Dmitrevskiy ◽  
L. I. Lobkovskii
Keyword(s):  
Deep Water ◽  
Barents Sea ◽  
The Arctic ◽  
Natural Phenomena ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Franz Josef Land ◽  
Eastern Shelf ◽  
Almost All ◽  
Perennial Ice

The results of recent geological and geophysical expeditions indicate the activation of hazardous natural phenomena associated with ice gouging and represent geohazard for almost all activities, including operation of the Northern Sea Route. Within the Barents Sea and the western part of the Kara Sea, the modern ice gouging is mainly associated with icebergs which are formed as a result of the destruction of the glaciers of Novaya Zemlya, the Spitsbergen archipelago and Franz Josef Land, while on the eastern shelf it is caused by the destruction of seasonal or perennial ice fields. Fixed furrows can be divided into modern coastal gouges or deep water ploughmarks. All deep water gouges within the periglacial and glacial shelf are of paleogeographical origin, but with different mechanisms of action on the seabed. These furrows were formed by floating ice on the periglacial shelf. On the glacial shelf deep water ploughmarks were formed by large icebergs, which could carry out the gouging even on the continental slope and deep-sea ridges of the Arctic Ocean.

scholarly journals Polychaete genus Pholoe (Polychaeta: Pholoidae) in the north-east region of the Barents Sea

2021 ◽  
Vol 12 (3-2021) ◽  
pp. 88-97
Author(s):  
K.K. Moskvin ◽  
Keyword(s):  
Barents Sea ◽  
Size Structure ◽  
Novaya Zemlya Archipelago ◽  
North West ◽  
Novaya Zemlya ◽  
North East ◽  
The North ◽  
East Region ◽  
The Barents Sea ◽  
Franz Josef Land

The paper describes species composition, distribution and biology of the polychaeta genus Pholoe in the north-east region of the Barents Sea (between Franz Josef Land and north-west coast of Novaya Zemlya archipelago). One species of the genu s was identified based on the reviewed morphological descriptions – Pholoe assimilis. The highest values of population density (1130 specimens/m2) and biomass (570 mg/m2) were registered in comparatively warm coastal waters of Novaya Zemlya archipelago. Pholoe assimilis’ population size structure based on the dorsal width of the fifth chaetiger was investigated for the first time. Size-frequency histograms indicate presence of at least four size classes.

scholarly journals Identification and characteristics of surge-type glaciers on Novaya Zemlya, Russian Arctic

2009 ◽  
Vol 55 (194) ◽  
pp. 960-972 ◽  
Author(s):  
Katie L. Grant ◽  
Chris R. Stokes ◽  
Ian S. Evans
Keyword(s):  
Barents Sea ◽  
Russian Arctic ◽  
Median Length ◽  
Novaya Zemlya Archipelago ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Surface Slopes ◽  
Catchment Areas ◽  
Median Area ◽  
Median Slope

AbstractWe present a comprehensive new inventory of surge-type glaciers on the Novaya Zemlya archipelago, using high-resolution (up to 4 m) satellite imagery from 1976/77 (Hexagon), 1989 (Landsat TM), 2001 (Landsat ETM+) and 2006 (ASTER). A total of 692 glaciers and their forelands were observed for glaciological and geomorphological criteria indicative of glacier surging (e.g. looped moraines, heavy surface crevassing, surface potholes, thrust-block moraines, concertina eskers). This enabled the identification of 32 potential surge-type glaciers (compared with four previously identified) representing 4.6% of the total but 18% by glacier area. We assess the characteristics of surge-type glaciers. Surge-type glaciers are statistically different from non-surge-type glaciers in terms of their area, length, surface slope, minimum elevation, mid-range elevation and terminus type. They are typically long (median length 18.5 km), large (median area 106.8 km2) outlet glaciers, with relatively low overall surface slopes (median slope 1.7°) and tend to terminate in water (marine or lacustrine). They are predominantly directed towards and located in the more maritime western region of the Russian Arctic, and we suggest that surge occurrence might be related to large and complex catchment areas that receive increased delivery of precipitation from the Barents Sea.

scholarly journals RED KING CRAB IN THE COASTAL BARENTS SEA: A REVIEW OF MMBI STUDIES

2020 ◽  
Vol 11 (4) ◽  
pp. 134-150
Author(s):  
A.G. Dvoretsky ◽  
Keyword(s):  
Barents Sea ◽  
Benthic Communities ◽  
Red King Crab ◽  
Indigenous Status ◽  
King Crab ◽  
Symbiotic Relationships ◽  
The Barents Sea ◽  
Fishery Science

In 1960th, red king crab was intentionally introduced into the Barents Sea. This species has formed a new self-sustaining population. In Russian waters, the commercial fishery of red king crab was started in 2004. Non-indigenous status and high commercial value of the crab have led to growing interest in the study of its biology and ecology. Red king crab has been intensively studied by specialists of Murmansk Marine Biological Institute to evaluate the role of this crab in local benthic communities and provide a theoretic basis and important applications for fishery science. New data on the population dynamics, symbiotic relationships, feeding and reproduction of red king crab have been obtained from long-term studies in coastal waters of the Barents Sea. Significant results of these studies are presented in this review.

scholarly journals On the diversity of settlements of the bivalve mollusk Macoma calcarea (Bivalvia,Tellinidae) off the coast of Novaya Zemlya.

2020 ◽  
Vol 11 (5-2020) ◽  
pp. 116-125
Author(s):  
A.E. Noskovich ◽  
Keyword(s):  
High Mortality ◽  
Barents Sea ◽  
Bivalve Mollusk ◽  
Water Masses ◽  
High Biomass ◽  
Size Classes ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Group I ◽  
Silty Soils

In the eastern part of the Barents Sea, there are 3 types of settlements of the bivalve mollusk Macoma calcarea. At low positive temperatures (from 0.6 to 1.3 оC),juveniles predominate on sandy-silty soils in settlements with low biomass, uneven growth and high mortality. In colder water masses (–0.4...–1.5 оC), M. calcareasettlements consist of long-lived, evenly growing large individuals that form high biomass values. In the settlement of group I, there was an increased elimination of certain size classes. The distribution of settlements depends little on the depth and salinity.

scholarly journals Assessment of initial seismic impacts on the northern part of the Barents Sea shelf (Novaya Zemlya region) for the purpose of seismic microzoning in the areas of prospective hydrocarbon mining

2019 ◽  
pp. 38-47
Author(s):  
I. G. Mindel ◽  
B. A. Trifonov ◽  
M. D. Kaurkin ◽  
V. V. Nesynov
Keyword(s):  
Oil And Gas ◽  
Barents Sea ◽  
Arctic Shelf ◽  
The Arctic ◽  
Russian Arctic ◽  
Seismic Microzoning ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
National Task ◽  
Seismic Impacts

In recent years, in connection with the national task of developing the Arctic territories of Russia and the perspective increase in the hydrocarbon mining on the Arctic shelf, more attention is being paid to the study of seismicity in the Barents Sea shelf. The development of the Russian Arctic shelf with the prospect of increasing hydrocarbon mining is a strategically important issue. Research by B.A. Assinovskaya (1990, 1994) and Ya.V. Konechnaya (2015) allowed the authors to estimate the seismic effects for the northern part of the Barents Sea shelf (Novaya Zemlya region). The paper presents the assessment results of the initial seismic impacts that can be used to solve seismic microzoning problems in the areas of oil and gas infrastructure during the economic development of the Arctic territory.

scholarly journals Effect of light-emitting diodes (LEDs) on snow crab catch rates in the Barents Sea pot fishery

2019 ◽  
Vol 76 (6) ◽  
pp. 1893-1901 ◽  
Author(s):  
Khanh Q Nguyen ◽  
Odd-Børre Humborstad ◽  
Svein Løkkeborg ◽  
Paul D Winger ◽  
Shannon M Bayse
Keyword(s):  
Capital Investment ◽  
Barents Sea ◽  
Economic Benefits ◽  
Financial Strain ◽  
Snow Crab ◽  
Catch Per Unit Effort ◽  
Important Species ◽  
Light Emitting ◽  
The Barents Sea ◽  
Catch Rates

Abstract Snow crab (Chionoecetes opilio) has become an important species for the Norwegian seafood industry since its first commercial harvest in 2012. However, periodically catch rates can be low, causing a financial strain on the fishery. Thus, improving the catch rate of existing pot designs has the potential to significantly improve the profitability of fishing enterprises. In this study, we investigated whether the addition of low-powered purple and white light-emitting diode (LED) fishing lights inside the pots could improve catch rates of snow crab in the Barents Sea. Results showed that pots with purple lights harvested a 12.8% higher catch per unit effort (CPUE; number of crab per pot) of legal-sized crab, which was significantly more than the control pots (p = 0.035); pots with white lights did not catch significantly more crab (p > 0.05). Pots equipped with only light (no bait) caught very few crabs and were not considered a viable alternative. Although purple LEDs increased snow crab capture, the economic benefits of using underwater lights in pots remains unclear given the high capital investment required.

scholarly journals Temperature selection and the final thermal preferendum of snow crab (Chionoecetes opilio, Decapoda) from the Barents Sea

Polar Biology ◽  
2019 ◽  
Vol 42 (10) ◽  
pp. 1911-1914 ◽  
Author(s):  
Sten Ivar Siikavuopio ◽  
Snorre Bakke ◽  
Bjørn Steinar Sæther ◽  
Tina Thesslund ◽  
Jørgen S. Christiansen
Keyword(s):  
Barents Sea ◽  
Snow Crab ◽  
Temperature Selection ◽  
Chionoecetes Opilio ◽  
The Barents Sea
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