Organic Carbon and Particle-Size Distribution in the Littoral Bottom Sediments of the Laspi Bay (the Black Sea)

Orekhova, N. A.; Ovsyany, E. I.

doi:10.22449/1573-160x-2020-3-266-277

Cited by 3 publications

(4 citation statements)

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“…This stronger relationship is explained by the fact that in modern sediments in the coastal areas of the Black Sea, organic carbon also accumulates in silty sands with inclusions of shell detritus (1.7-2.1% dry wt.). In earlier works, it was noted that for coarse-grained sediments in the Crimea coastal regions, the content of C org did not exceed 1% [39,52,53]. The data obtained in this work indicate a significant excess of the studied values.…”

Section: Discussionsupporting

confidence: 49%

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Characteristics of Bottom Sediments in the Coastal Areas of the Crimean Peninsula

Gurova

Gurov

Orekhova

2022

Land

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The aim of this work was to assess the influence of physical, chemical, and hydrochemical factors on the characteristics of bottom sediments in various areas of the shelf of the Crimean Peninsula. The data obtained during the cruises of the RV “Professor Vodianitsky” in the fall of 2018 and summer of 2019 were analyzed. Hydrochemical analyses of the bottom waters were carried out using standard hydrochemical methods. Profiles of dissolved oxygen, hydrogen sulfide, and oxidized and reduced forms of iron in pore waters were obtained, and the geochemical characteristics of bottom sediments were determined. The features of their spatial and vertical distributions were considered. Pelite-aleuritic sediments with inclusions of sandy material and shell detritus prevailed in the coastal zone of the Crimean shelf. The organic carbon content varied from 0.5–0.6% in the gravel–sand sediments of the Kerch pre-strait area to 2.5–2.7% in the northwestern part. The prevalence of suboxic conditions was noted, and the main processes in the sediment upper layer were controlled mainly by reactions involving iron. In some areas of the southern coast of Crimea and the Kerch pre-strait area from the Sea of Azov, the development of anoxic conditions in the surface layer of bottom sediments was recorded.

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Section: Discussionsupporting

confidence: 49%

“…did not exceed 1% [39,52,53]. The data obtained in this work indicate a significant excess of the studied values.…”

Section: Discussionsupporting

confidence: 48%

Characteristics of Bottom Sediments in the Coastal Areas of the Crimean Peninsula

Gurova

Gurov

Orekhova

2022

Land

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“…We therefore propose the percentage of pelitic fraction (<63 μm) as a proxy of the POM of the sediment. Organic matter accumulation is determined by environmental dynamics (currents, fine particles transfer to deep areas) (Orekhova and Ovsyany, 2020). A considerable percentage of pelitic fraction can also correspond to Muddy Detrital Bottoms (MDB).…”

Section: Box 6: Particulate Organic Matter (Pom) Of the Sedimentmentioning

confidence: 99%

Ecosystem-based assessment of a widespread Mediterranean marine habitat: The Coastal Detrital Bottoms, with a special focus on epibenthic assemblages

et al. 2023

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IntroductionCoastal detrital bottoms (CDB) are one of the most extensive habitats of the continental shelf worldwide, in the upper levels of the circalittoral zone. Hosting a diverse community structured by sediment grain size, trophic interactions and calcified organisms, CDB exhibit important ecological functions. In the Mediterranean Sea, CDB are constituted by recent elements partly provided by adjacent infralittoral and circalittoral ecosystems. Since the 2010s, the offshore extension of many Marine Protected Areas (MPAs) has resulted in the incorporation of vast areas of CDB, raising the issue of their management. The Marine Strategy Framework Directive (MSFD) has embraced the concept of an ecosystem-based approach involving taking into account the functioning of marine habitats and their related ecosystem services. The purpose of this paper is to propose an ecosystem-based quality index (EBQI) tested on CDB from the north-western Mediterranean Sea, focusing mainly on epibenthic assemblages.MethodsThe first step has been to define a conceptual model of the CDB functioning, including the main trophic compartments and their relative weighting, then to identify appropriate assessment methods and potential descriptors. Twenty-nine sites were sampled along the coast of Provence and French Riviera (Southern France). Study sites were chosen with a view to encompassing a wide range of hydrological conditions and human pressures.ResultsVery well-preserved sites were found in Provence in areas without trawling and terrigenous inputs, while impacted and low-ES sites were located in the vicinity of urbanized areas. The cover of rhodoliths characterizes the seascape and might be an indicator of the good ES of CDB and reduced human pressure. However, the absence of rhodoliths may also be induced by natural phenomena.DiscussionThe EBQI designed for CDB proved representative and useful for a functional assessment based on epibenthic assemblages. However, some descriptors have shown their limitations and should be further explored. We highlight here the priority of establishing an index corresponding to a societal demand (e.g., European Directives, Barcelona convention) as a basis for a broad and large-scale assessment, for practical reasons. We stress the need to better apprehend the role of the macro-infauna and to extend this index over a wider geographical scale.

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“…Depending on the approach, the number of identified types varies from 4 to 20 [17][18][19]. In the modern period, for certain water areas of the Black Sea (mainly the Crimean Peninsula), the typification of bottom sediments for applied purposes is used by the specialists of Marine Hydrophysical Institute of RAS [13,[20][21][22]. According to the studies carried out by specialists of the Azov-Black Sea branch of FSBSI "VNIRO" ("AzNIIRKH") in the northeastern part of the Black Sea, four most common types of bottom sediments, determined on the basis of typification by external distinctive features, were identified.…”

Section: T a B L Ementioning

confidence: 99%

Heavy Metals in the Bottom Sediments of the Black Sea Northwestern Shelf in Recent Years

Korablina¹,

Барабашин²,

Katalevsky³

2021

PhO

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Purpose. The study is aimed at investigating metal accumulation in the 0–2 cm layer of the bottom sediments of the Black Sea northwestern shelf over 2000–2020, and at identifying the sea bottom areas subjected to the increased anthropogenic load through comprehensive assessment of the degree of their pollution taking into account their granulometric composition. Methods and Results. The bottom sediments were sampled annually from the 0–2 cm depth at the same stations. The detected metal concentrations were compared with their content in the Earth crust and the background values. The dynamics and trends of the individual metals’ content in the shelf bottom sediments were assessed for the whole period of observations. The notion of the average characteristic concentration of an element is introduced; the procedure for its calculation is represented. The pollution of bottom sediments was analyzed with the regard for the element average characteristic concentration in the bottom sediments of various granulometric types. Increase in the average content of lead, zinc and chromium was revealed from the beginning of the observation period to 2020. The seasonal dynamics of these elements was found in the whole water area under study (as well as the iron content at some areas). Conclusions. Multiple cases of the lead, manganese and chrome concentrations exceeding their content in the Earth crust were recorded; as for zinc and copper, such cases were few and sporadic. The tendencies in variation of the bottom sediments content were determined: the average long-term values of the lead concentration increased by 1.2 times, those of zinc – by 1.6 times, and those of chrome – by 2 times; the concentrations of iron, manganese and copper remained essentially the same. Seasonal dynamics of the zinc, chromium, lead and iron content was shown. For a number of metals, the cases when their absolute content exceeded their average characteristic concentration in the corresponding type of the bottom sediments had been found. The regions subjected to a multi-faceted anthropogenic load were identified; the areas of possible local inflow of the monitored elements were revealed. The bottom sediments sampled in 2019 were the most polluted.

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Organic Carbon and Particle-Size Distribution in the Littoral Bottom Sediments of the Laspi Bay (the Black Sea)

Cited by 3 publications

References 4 publications

Characteristics of Bottom Sediments in the Coastal Areas of the Crimean Peninsula

Characteristics of Bottom Sediments in the Coastal Areas of the Crimean Peninsula

Ecosystem-based assessment of a widespread Mediterranean marine habitat: The Coastal Detrital Bottoms, with a special focus on epibenthic assemblages

Heavy Metals in the Bottom Sediments of the Black Sea Northwestern Shelf in Recent Years

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