Benthic community structure near the margin of the oxic zone: A case study on the Black Sea

Galina, A. Kolyuchkina; Vitaly, L. Syomin; Ulyana, V. Simakova; Nelli, G. Sergeeva; Ananiev, R. A.; Nikolay, N. Dmitrevsky; Iván, Veronika; Maria, Anna; Oleg, I. Podymov; Alexander, Byron; Alexander, Gino

doi:10.1016/j.jmarsys.2021.103691

Cited by 11 publications

(5 citation statements)

References 47 publications

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“…However, no clear evidence of such an effect on benthos was found on the continental slope of the northeastern Black Sea. According to the present data [40], based on continuous 2-month-long observations, a boundary between different biological communities at the depth of 80-150 m is determined only by the total duration of hypoxia. A complete transfer from a depleted ecosystem to an ephemeral one only occurs if, during the mentioned 2-month observation period, the total hypoxia duration exceeds 1.5 months.…”

Section: Discussionmentioning

confidence: 78%

Upwellings and Downwellings Caused by Mesoscale Water Dynamics in the Coastal Zone of Northeastern Black Sea

Podymov,

Ocherednik,

Silvestrova

et al. 2023

JMSE

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The paper analyzes quasiperiodic upwellings and downwellings on the shelf and upper part of continental slope of the northeastern Black Sea. It is shown that these processes are related to changes in intensity and direction of alongshore current and the following geostrophic adjustment of the density field. The source of such changes is the meandering of the Black Sea Rim Current (RC). It leads to a quasiperiodic change in direction of the alongshore current, from northwestern (cyclonic RC meander) to southeastern (anticyclonic RC meander, or eddy). These cycles, or phases, have an average duration of about 10 days. During the northwestern phase, the permanent Black Sea pycnohalocline (hereafter pycnocline) and seasonal thermocline descend, their thickness increases, and so does the thickness of the upper mixed layer (UML). During the southeastern phase, both the pycnocline and seasonal thermocline ascend and become thinner, along with the UML, which also becomes thinner. In both phases, isopycnals in the pycnocline and isotherms in the thermocline demonstrate quasi-in-phase vertical oscillations, which have a good correlation with the speed and direction of the alongshore current. These correlations allow estimation of the magnitude of upwellings and downwellings in the shelf–slope area of the northeastern Black Sea using data series of current velocity profiles.

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Section: Discussionmentioning

confidence: 78%

Upwellings and Downwellings Caused by Mesoscale Water Dynamics in the Coastal Zone of Northeastern Black Sea

Podymov,

Ocherednik,

Silvestrova

et al. 2023

JMSE

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“…The subsurface moored profiler Aqualog stores the observation data in the internal memory for a retrospective study after the recovery of the mooring. Examples of such analyses can be found in References [6,24]. In future, these systems should be complemented by sediment traps installed at fixed depths below the profiler's operational depth to assess the composition of the sinking material in the deep layers of the Black Sea.…”

Section: Discussionmentioning

confidence: 99%

Automated Tethered Profiler for Hydrophysical and Bio-Optical Measurements in the Black Sea Carbon Observational Site

Ostrovskii

Emelianov

Kochetov

et al. 2022

JMSE

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Biogeochemical cycles of carbon transformation throughout the euphotic zone of the sea are controlled by physical processes, e.g., daily thermocline, variation in solar irradiance, thermohaline convection, and intermittent mixing. These processes should be regularly observed with sufficient time resolution at fixed geographical locations. This study provides a brief overview of the carbon observational site in the Northeastern Black Sea. The focus is on the design of a new tethered profiler Winchi for the inner continental shelf part of the site. The profiler hull and two outriggers comprise an open trimaran platform that is positively buoyant and tends to maintain a horizontal position in the water. The lower end of the winch wire is secured to the bottom anchor. By unwinding/winding the wire, the profiler ascends/descends while measuring the depth profiles of marine environment parameters ranging from the seafloor to air–sea interface. After surfacing, the profiler determines its location using the Global Positioning System (GPS) and transmits data to (and from) a server on land through the Global System for Mobile Communications (GSM). Initial field tests with the Winchi profiler at the Northeastern Black Sea shelf exhibited promising results. We report these early tests to demonstrate the use of Winchi.

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“…The presence of Synarachnactis lloydii in the Black Sea is surprising, but it should not be speculated as a recent invasion. In the Black Sea, the species was collected in a very characteristic biotope-at a low shelf, often in association with bivalve Modiolula phaseolina (Philippi, 1844) [41]. This type of community has been reported since the 1950s all around the Black Sea, usually associated with temporal or permanent oxygen depletion zones [42][43][44][45][46][47].…”

Section: Geographic Distribution Of the Genus Synarachnactismentioning

confidence: 99%

Cerianthus lloydii (Ceriantharia: Anthozoa: Cnidaria): New Status and New Perspectives

Molodtsova,

Moskalenko,

Lipukhin

et al. 2023

Biology

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Subclass Ceriantharia is a well-defined and probably ancient group of marine benthic organisms renowned for their bilateral symmetry, which is reflected in the arrangement of tentacles and mesenteries. Four species of Ceriantharia have been reported in the Arctic, including Cerianthus lloydii Gosse, 1859, also known from the Northern Atlantic and Northern Pacific. The integrity of this species was questioned in the literature, so we performed a molecular study of C. lloydii from several geographically distant locations using 18S and COI genes. The phylogenetic reconstructions show that specimens of C. lloydii form a single group with high support (>0.98), subdivided into distinctive clades: (1) specimens from Northern Europe, the Black and Barents seas, and (2) specimens from the White, Kara, Laptev, and Bering seas and also the Canadian Arctic and the Labrador Sea available via the BOLD database. There are several BOLD COI sequences of Pachycerianthus borealis (Verrill, 1873), which form a third clade of the C. lloydii group, sister to the European and Arctic clades. Based on low similarity (COI 86–87%) between C. lloydii and the type species of the genus Cerianthus Delle Chiaje, 1841—C. membranaceus (Gmelin, 1791), we propose a new status for the genus Synarachnactis Carlgren, 1924, and a new family Synarachnactidae to accommodate C. lloydii.

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Benthic community structure near the margin of the oxic zone: A case study on the Black Sea

Cited by 11 publications

References 47 publications

Upwellings and Downwellings Caused by Mesoscale Water Dynamics in the Coastal Zone of Northeastern Black Sea

Upwellings and Downwellings Caused by Mesoscale Water Dynamics in the Coastal Zone of Northeastern Black Sea

Automated Tethered Profiler for Hydrophysical and Bio-Optical Measurements in the Black Sea Carbon Observational Site

Cerianthus lloydii (Ceriantharia: Anthozoa: Cnidaria): New Status and New Perspectives

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