Organic matter and its transformation rates in different sea ecosystems

2021 ◽  
pp. 212-235
Author(s):  
A.I. Agatova ◽  
◽  
N.M. Lapina ◽  
N.I. Torgunova ◽  
K.V. Kodryan ◽  
...  
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
High Latitude ◽  
Barents Sea ◽  
Qualitative Composition ◽  
Large Variability ◽  
Deep Waters ◽  
The Barents Sea ◽  
Oil Hydrocarbons ◽  
Significant Intensification

The article includes proprietary data and data from literature from the last 30 years about the fluctuations in concentration and the elemental and biochemical make-up of the dissolved and particulate organic matter (DOM and POM, respectively) in the different ecosystems of the Barents Sea. The large variability of these values in both surface and deep waters is shown, depending on the intensity of the hydrological and biological processes.DOM concentrations varied from 59 to 664 μMCorg, while POM varied from 0.25 to 38.08 μMCorg. The reduction of the ice cover affected both the distribution and the qualitative composition of the DOM and the POM. This reduction, as well as the increased flow of Atlantic waters, contributed not only to an increase in the primary production of organic matter, but also to a significant intensification of redox and hydrolytic processes of its transformation, especially in the high-latitude part of the Barents Sea. The DOM of the sea is characterized by high C / P ratios, far exceeding those of Redfeld. At the same time, C / N ratios in the most productive waters are close to those of Redfeld. We highlighted four regions in the sea where concentrations of dissolved carbohydrates increase towards the bottom, which indicates that oil hydrocarbons are supplied here.

scholarly journals Composition and content of free amino acids of sublittoral red algae from Murmansk coast of the Barents Sea.

2020 ◽  
Vol 11 (5-2020) ◽  
pp. 92-102
Author(s):  
M.P. Klindukh ◽  
◽  
I.V. Ryzhik ◽  
E.O. Dobychina ◽  
◽  
...  
Keyword(s):  
Amino Acids ◽  
Red Algae ◽  
Free Amino Acids ◽  
Free Amino ◽  
Barents Sea ◽  
Qualitative Composition ◽  
The Barents Sea ◽  
Protein Amino Acids

Data on the content of free amino acids (FAA) in four species of red algae are presented. The content of 20 amino acids was determined in the composition of FAA of the studied species. The largest amounts contained glutamic and aspartic acids, alanine, proline and taurine. The studied algae do not differ in the qualitative composition of protein amino acids, but differ in the presence and content of nonprotein ones. The content of most of the FAA and their summ was the highest for Phycodrysrubens, and in Palmaria palmatathe smallest.

scholarly journals Virio- and bacterioplankton of the Barents Sea in the autumn

2021 ◽  
Vol 12 (3-2021) ◽  
pp. 45-53
Author(s):  
M.P. Venger ◽  
Keyword(s):  
Organic Matter ◽  
Barents Sea ◽  
The Arctic ◽  
Quantitative Composition ◽  
Autumn Period ◽  
Late Autumn ◽  
The Barents Sea ◽  
Cell Volumes

In the autumn period 2011, 2015 in the waters of the Barents Sea, the communities of viruses and bacteria were studied, their quantitative composition was determined, and the nature of their distribution was studied. It was shown that the distribution of both virio- and bacterioplankton had pronounced zoning presumably due to increased concentrations of organic matter in more productive coastal and Atlantic waters compared to the Arctic. In September 2011, the number of viruses varied from 0.6 to 46.7 million particles/ml, exceeding the abundance of bacteria by 5 times an average. The quantity of bacterioplankton varied within 0.3–2.9 million cells/ml, biomass – 4.1–35.1 mg C/m3, with a range of mean cell volumes of 0.030–0.115 μm3. In November–December 2015, the abundance of viruses was 0.3–6.4 million particles/ml and quantitatively exceeded their bacterial hosts by 18 times an average. The quantity and biomass of bacteria varied within 0.02–0.3 million cells/ml and 0.3–2.7 mg C/m3, with a range of mean cell volumes of 0.013–0.068 μm3. It was found that the level of development of virio- and bacterioplankton significantly decreased by the late autumn period.

Biogeochemical processes in the Barents sea

2021 ◽  
pp. 287-306
Author(s):  
A.Yu. Lein ◽  
◽  
A.S. Savvichev ◽  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Methane Concentration ◽  
Barents Sea ◽  
Biogeochemical Processes ◽  
Total Abundance ◽  
The North ◽  
The Barents Sea ◽  
Continental Origin ◽  
Biomass Of Microorganisms

Biogeochemical processes involving microorganisms play an important role in marine sedimentogenesis. The study of biogeochemical processes in the Barents Sea was carried out from 1997 with interruptions until 2019. Using a complex of geological-geochemical, microbiological, radioisotope and stable isotope methods, it was possible to obtain a quantitative estimate of the total abundance and biomass of microorganisms, rates of biogeochemical processes, methane content and organic matter suspended. In the course of work in four expeditions, it was found that in the surface (0–10 m) water column south of 74° N the magnitude of the total abundance and the biomass of microorganisms increased by 2019 by about 5 times compared to 1998. To the north, in colder waters, the total abundance and the biomass of organisms were lower than in the southern region of the sea. The methane concentration in the surface layer of the water column at the border with the atmosphere did not change much for 20 years (1976–1997) and increased noticeably from 1997 to 2017, from 3.3 to 15.8 nM. The increase in FFM, the biomass of organisms and the concentration of methane in the water column is associated with the melting of glaciers, with the release of organic matter of continental origin released from ice into the water. The results of the work indicate changes in the ecosystem of the Barents Sea.

Hydrocarbons in waters and bottom sediments Of the Barents sea

2021 ◽  
pp. 531-547
Author(s):  
I.A. Nemirovskaya ◽  
◽  
A.M. Titova ◽  
A.V. Khramtsova ◽  
◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Layer ◽  
Organic Carbon ◽  
Bottom Sediments ◽  
Suspended Matter ◽  
Biochemical Composition ◽  
Barents Sea ◽  
Oil Pollution ◽  
Early Summer ◽  
The Barents Sea

Hydrocarbons in water, suspended matter and bottom sediments of the Barents Sea were studied based on materials from expeditions to the RV Akademik Mstislav Keldysh in 2016–2019. It is shown that at present there is no oil pollution in open areas of the Barents Sea. With the transition from early summer (2019) to autumn (2016), there was a decrease in hydrocarbon concentrations in surface waters, caused by a change in the biochemical composition of organic matter (possibly due to a decrease in the area of ice). With depth, the HC content decreased mainly. An exception was observed in the area of gutters and deposits, where in the bottom nepheloid layers there was an increase in the concentration of hydrocarbons in suspension and in the surface layer of bottom sediments, and in the thickness of the sediments there was no dependence on their distribution and organic carbon.

Pelagic and sympagic contribution of organic matter to zooplankton and vertical export in the Barents Sea marginal ice zone

2008 ◽  
Vol 55 (20-21) ◽  
pp. 2330-2339 ◽  
Author(s):  
Tobias Tamelander ◽  
Marit Reigstad ◽  
Haakon Hop ◽  
Michael L. Carroll ◽  
Paul Wassmann
Keyword(s):  
Organic Matter ◽  
Barents Sea ◽  
The Barents Sea ◽  
Marginal Ice Zone ◽  
Vertical Export

scholarly journals Escape mortality of cod, saithe, and haddock in a Barents Sea trawl fishery

2007 ◽  
Vol 64 (9) ◽  
pp. 1836-1844 ◽  
Author(s):  
Ólafur Arnar Ingólfsson ◽  
Aud Vold Soldal ◽  
Irene Huse ◽  
Mike Breen
Keyword(s):  
Barents Sea ◽  
Fish Length ◽  
Commercial Fishing ◽  
Experimental Conditions ◽  
Closely Related Species ◽  
Large Variability ◽  
Trawl Fishery ◽  
The Barents Sea ◽  
Methodological Problems ◽  
Low Levels

Abstract Ingólfsson, Ó. A., Soldal, A. V., Huse, I., and Breen, M. 2007. Escape mortality of cod, saithe, and haddock in a Barents Sea trawl fishery. – ICES Journal of Marine Science, 64: 000–000. We investigated the survival of gadoid fish in the Barents Sea escaping from a demersal trawl during commercial fishing conditions, with and without a sorting grid, at high and low levels of fishing intensity. The mortality of cod and saithe was negligible and unrelated to experimental conditions. Haddock mortality was generally greater than observed in earlier experiments and inversely related to fish length. Any possible effects of experimental conditions were hidden by large variability in the observed rates of mortality. We conclude that the observed mortality of haddock is confounded by methodological problems, particularly the instability of the observation cages, and does not reflect the true escape mortality. Cod and saithe are capable of surviving the stress of passage through, and escape from, the trawl, whereas haddock are more vulnerable, despite being a closely related species.

scholarly journals The problem of genesis of quaternary deposits of the Barents Sea as a reflection of the overall crisis of glacial theory

2020 ◽  
pp. 80-102
Author(s):  
Rudol'f Borisovich Krapivner
Keyword(s):  
High Latitude ◽  
Barents Sea ◽  
Quaternary Sediments ◽  
The Barents Sea ◽  
Marine Sedimentation ◽  
Seismic Image ◽  
Degree Of Consolidation ◽  
River Valleys ◽  
Acoustic Profiling ◽  
Sedimentation Processes

This article continues the discussion on quaternary geology and paleogeography of the vast and well-studied shelf of the Barents Sea. The object this research is the relief and quaternary formations of the Barents shelf. The data of seismic-acoustic profiling and materials of engineering-geological drilling were used. Since the Barents shelf is a high-latitude area of Holocene sedimentation, the author analyzes various aspects of the quaternary sediments genesis, taking into account the geographic zoning of marine sedimentation processes and an increase in the gravitational consolidation of sediments down through the section. The genetic link between the microstructure and the degree of consolidation of clayey sediments with their seismic image was revealed, which was considered in interpretation of seismic profiling materials. Over the Barents shelf, the cover of weakly consolidated sediments of the last marine transgression is separated from the underlying morainelike or pre-quaternary sediments by a diachronous boundary of stratigraphic and sometimes angular unconformity. The transgression is not of glacioeustatic, but of tectonic nature. During the hiatus that preceded it, an erosional relief with river valleys and their tributaries was formed, the main features of which have been preserved in the northern deep-water part of the sea. The conclusion is argued that approbation of the glacial theory on the example of high-latitude Arctic shelf contradicts the facts and main provisions of glaciology, reflecting the overall crisis of this theory.

scholarly journals Line transects, environmental data and GIS: Cetacean distribution, habitat and prey selection along the Barents Sea shelf edge

2009 ◽  
Vol 7 ◽  
pp. 179 ◽  
Author(s):  
Mette Skern-Mauritzen ◽  
Hans Julius Skaug ◽  
Nils Øien
Keyword(s):  
Environmental Changes ◽  
Barents Sea ◽  
Prey Selection ◽  
Environmental Data ◽  
Shelf Edge ◽  
Physeter Macrocephalus ◽  
Sperm Whales ◽  
Deep Waters ◽  
The Barents Sea ◽  
Population Sizes

Cetacean observations obtained during sighting surveys for abundance estimation can also be used to investigate cetacean habitat and prey selection, the principal processes underlying cetacean distributions. In this paper, we investigate habitat and prey selection of minke (Balaenoptera acutorostrata), fin (B. physalus) and sperm (Physeter macrocephalus) whales and Lagenorhynchus (Atlantic white-sided L. acutus and white-beaked L. albirostris) dolphins observed along predetermined cruise tracks along the Barents Sea shelf edge in 2000, 2001 and 2002. The observations were combined with simultaneously collected data on habitat (depth, sea surface temperature, and temperature gradients) and prey (plankton, 0-group fish, capelin and herring) distributions in a GeographicInformation System (GIS) to investigate habitat and prey selection. Minke whales were associated with cold waters and herring, and capelin in years with low herring abundance. Fin whales were mainly associated with northern cold and deep waters, as well as capelin, 0-group fish and plankton. Lagenorhynchus dolphins were associated with capelin. Finally, sperm whales were associated with deep waters and 0-group fish. Sperm whales were probably indirectly attracted to 0-group fish through preying on predatory fish such as Sebastes spp. and the squid Gonatus spp. The cetacean species responded differently to annual variation in habitat and prey distributions. Minke and fin whale distributions and abundances remained similar between years within the study area, suggestingthat these species are generalists responding to environmental changes by switching between prey species. Conversely, Lagenorhynchus dolphins shifted northwards, likely due to tracking the shifting capelin distributions. The results are discussed in light of how such cetacean habitat and cetacean prey relationships can be valuable for the proper assessment of population sizes and trends, both through guiding the design of sighting surveys and assessing whether changes in abundances within fixed surveyed areas are due to distribution shifts or changes in population sizes.

Zooplankton the Barents Sea

2021 ◽  
pp. 331-351
Author(s):  
E.G. Arashkevich ◽  
Keyword(s):  
Organic Matter ◽  
Barents Sea ◽  
Vertical Flux ◽  
Published Data ◽  
Warming Climate ◽  
The Barents Sea ◽  
Barents Sea Ecosystem

A review of the published data on the distribution of biomass of zooplankton and its main groups: mesozooplankton, meroplankton, crustacean macrozooplankton and gelatinous macrozooplankton in the Barents Sea is presented. The factors that determine the amplitude and direction of interannual changes in the abundance of zooplankton are considered. The results of studies on the role of zooplankton in biotransformation and vertical flux of organic matter are presented. The data on the possible effect of warming climate on the Barents Sea ecosystem is analyzed.

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