Estimation of multi-scale temporal variability of air and water temperature in the northeastern part of the Black Sea

2009 ◽  
Vol 34 (5) ◽  
pp. 316-320 ◽  
Author(s):  
V. B. Titov
Keyword(s):  
Water Temperature ◽  
Black Sea ◽  
Temporal Variability ◽  
The Black Sea ◽  
Northeastern Part ◽  
Multi Scale

Results of Monitoring of Temperature Conditions of Migration and Fishing of the Azov Khamsa

2020 ◽  
pp. 71-77
Author(s):  
Boris N. Panov ◽  
Elena O. Spiridonova ◽  
Michail M. Pyatinskiy ◽  
Aleksandr S. Arutyunyan
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Water Temperature ◽  
Black Sea ◽  
Sea Surface ◽  
The Black Sea ◽  
Sea Of Azov ◽  
The Sea Of Azov ◽  
Kerch Strait ◽  
Flood Zone

The paper presents the results of monitoring the process of migration and fishing of the Azov khamsa in April-May and October-November, 2019. The research used daily maps of sea surface temperature (SST) of the Black and Azov seas, built in the hydrometeorological Center of Russia according to NCDC/NOAA (Operational module Yessim - hmc.meteorf.ru/sea/black/sst/sst_black.htm) and daily fishing information of the Center for Monitoring of Fisheries and Communications. It is shown that in the spring, khamsa clusters begin to disperse and move to feeding places after the water temperature reaches 11 °C, and at a water temperature of 14-15 °C, the fish becomes much more mobile and the clusters finally disperse. In autumn, the Azov khamsa began to concentrate in the pre-flood zone of the Sea of Azov at an average SST of 16-17 °C, with a SST of 14-16 °C, the khamsa went out into the Kerch Strait. The active output of the khamsa into the Black Sea began at the SST of the pre-flood zone of 15 °C and almost stopped at the SST of about 13 °C. The average SST in the Kerch Strait dropped to 11 °C these days.

scholarly journals Different aspects of studying a diatom Cylindrotheca closterium (Ehrenberg) Reimann et Lewin 1964 in natural and laboratory conditions

2019 ◽  
Vol 4 (2) ◽  
pp. 52-62 ◽  
Author(s):  
L. I. Ryabushko ◽  
D. S. Balycheva ◽  
A. V. Bondarenko ◽  
S. N. Zheleznova ◽  
A. A. Begun ◽  
...  
Keyword(s):  
Light Intensity ◽  
Water Temperature ◽  
Sea Of Japan ◽  
Black Sea ◽  
The Black Sea ◽  
The Sea Of Japan ◽  
Average Cell ◽  
Cylindrotheca Closterium ◽  
Laboratory Conditions ◽  
Maximum Abundance

The article summarizes original and literary data on different aspects of studying Cylindrotheca closterium (Ehrenberg) Reimann et Lewin 1964 in two biotopes – phytoplankton and microphytobenthos – of the Black Sea, the Sea of Azov, and the Sea of Japan for the period from 1976 to 2016. The aim of the work is to present the results of the study mainly of own data on the morphology, systematics and ecology of C. closterium in different seas and under cultivation in the laboratory. Information on the history of the species origin and its nomenclature changes is given. C. closterium belongs to the phylum Bacillariophyta, class Bacillariophyceae, order Bacillariales Hendey 1937, family Bacillariaceae Ehrenb. 1831, genus Cylindrotheca Rabenhorst 1859 emend. Reim. et Lewin 1964. This benthoplanktonic species occurs in the plankton, in littoral and sublittoral zones of the seas. The species is marine and brackish-water; it is a cosmopolite common in different geographical zones of the World Ocean. The results of studying alga by various methods under natural and experimental conditions in light and transmission electron microscopes of C. Zeiss LIBRA-120 are presented. The quantitative data of C. closterium were determined by direct counting of the cells in the Goryaev’ camera (V = 0.9 mm³) in light microscopes BIOLAM L-212, C. Zeiss Axioskop 40 with the program AxioVision Rel. 4.6 at 10×40, 10×100, and Olympus BX41 (Tokyo, Japan) with lenses UPLanF140× and 100×1/30 oil immersion. Cultivation of C. closterium was carried out in the cumulative mode on the nutrient medium F, volume of 1 L under light intensity of 13.7 klx and temperature of +20…+21 °C. Morphology data of this species from different seas were obtained. The average cell sizes of C. closterium are: 25–260 µm length, 1.5–8 µm width; 12–25 fibulae in 10 µm. The results of cultivation in the laboratory conditions showed that the average cell sizes reached 148.17 µm (length) and 8 µm (width) at the temperature of +19…+20 °C and light intensity of 13 klx; length of cells reached 162.12 µm in the exponential phase of growth and 172.07 µm – in the stationary phase. C. closterium has an important practical significance as a source of fucoxanthin, since this alga is intensively cultivated for production of biologically active substances. Our experimental data showed that during laboratory cultivation the fucoxanthin concentration in a diatom biomass can reach 11 mg·g-1 of dry mass. The new data obtained are relevant and important; they can be used in different fields of science and medicine. The seasonal dynamics of population abundance of C. closterium in different ecotopes (epizoon of invertebrates and their food spectra, epiphyton of bottom vegetation, periphyton of the experimental and anthropogenic substrates of the different seas) is presented for the first time. The maximum abundance of the species population (65.6·10³ cells·cm-2) was registered in the epizoon of the mussel Mytilus galloprovincialis Lam. in March at the water temperature of +7.7 °C at a depth of 2.5 m in the Black Sea. The maximum abundance was registered in the epiphyton of green algae (896·10³ cells·cm-2) and in the periphyton of asbestos plates (728·10³ cells·cm-2) in August at the water temperature of +24.5 °C in the Sea of Japan. The abundance dynamics of C. closterium natural populations in the local habitats changed depending on the season, the depth, and the type of substrate. The similarities and differences in the distribution of C. closterium in the sea microphytobenthos are discussed.

scholarly journals Long-term dynamic of reproductive performance of European anchovy Engraulis encrasicolus Linnaeus, 1758 and its connection with temperature

2017 ◽  
Vol 2 (2) ◽  
pp. 3-19
Author(s):  
G. V. Zuev ◽  
T. N. Klimova
Keyword(s):  
Water Temperature ◽  
Black Sea ◽  
Relative Abundance ◽  
The Black Sea ◽  
Western Coast ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
European Anchovy Engraulis Encrasicolus ◽  
Calendar Dates

European anchovy (Engraulis encrasicolus Linnaeus, 1758) is one of the most numerous species of fish in the Azov-Black Sea basin. It is the main commercial fishery object, its share being about 80 %. Assessment of the functional state of the anchovy population and its dynamics in conditions of the climatic warming was one of the topical tasks in contemporary research. The paper is devoted to the study of a long-term dynamic of anchovy population: reproductive parameters and its relation with water temperature for the purpose of potential prediction. The results of our own investigations made in 2000–2015 in the area bordering the south-western coast of Crimean peninsula (Sevastopol–Balaklava region) have been considered in the paper. The eggs were collected with Bogorov – Rass net (BR-80/113) from the layer of 0–10 m. Adult specimen were caught with pound seines. 702 ichthyoplankton samples and 941 mature anchovy females (gonad maturation stage V, VI–IV and VI–V) were analyzed. Calendar dates and duration of spawning season, intensity and efficiency of spawning, intraspecific composition of mature anchovy females were researched. Calendar dates of anchovy spawning beginning near the south-western coast of Crimea in 2000–2014 varied from the 2ⁿᵈ decade of May (early spawning) to the 3ʳᵈ decade of June (late spawning); finishing dates – from the 3ʳᵈ decade of August to the 3ʳᵈ decade of September. Total reproductive period duration was 8–14 weeks, average – 11 weeks. In long-term plan the time shift for earlier calendar dates was determined at the start of the spawning. Maximum peak of spawning intensity in 2012–2013 varied from 33.6 to 78.7 % (average 51.2 %). Peak of population spawning was in July – August, its repeatability in July – 25 and in August 66.7 %. The peak spawning shift to the earlier time was determined in perennial plan: in 2000–2005 years peak spawning periodicity amounts in August to 100 %; in 2007–2013 – only 50 %. Absolute number of eggs (spawning efficiency) change from 1.6 to 29.9 specimen·m-2 in 2000–2014 years (average 10.3 specimen·m-2). Low, average and high yielding years with number of eggs less than 10, 10–20 and more than 20.0 specimen·m-2 were determined. The average spawning efficiency was: 5.1, 14.5 and 25.0 specimen·m-2 respectively. Spawning efficiency in high-yielding years exceeded 1.7 and 4.9 times the efficiency of low and average-yielding years. In long-term plan the positive efficiency spawning trend was determined. In 2000–2001 the intraspecific structure reconstruction of anchovy took place, followed by redistribution of numerical relation in composition of spawning part of the Azov and the Black Sea subspecies in favor of the last one. In 2000–2004 relative abundance of Black Sea anchovy amounted 33.3 %, in 2005–2011 years – 76.7 %. Simultaneously a considerable catch growth was registered. Сorrelation coefficient of the Black Sea anchovy’s relative abundance and catch was 0.92. Calendar time of spawning beginning, its intensity and efficiency are closely connected with the water temperature. Lower temperature limit for mass spawning was 17.5 °С. The region of “maximum favorable spawning temperature” lays in the range of 23 °C and warmer. Nearly 2/3 of population reproductive potential is realized within this temperature range.

Occurrence and Distribution of Cetaceans in the Northeastern Part of the Black Sea

Oceanology ◽  
2021 ◽  
Vol 61 (4) ◽  
pp. 488-498
Author(s):  
A. D. Chernetsky ◽  
V. V. Krasnova ◽  
A. N. Boltunov ◽  
E. M. Panova ◽  
A. V. Agafonov ◽  
...  
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Northeastern Part

The fate of river-borne floating marine litter in the coastal sea: a case study of flooding discharge from numerous small rivers in the northeastern part of the Black Sea

2020 ◽  
Author(s):  
Evgeniya Korshenko ◽  
Victor Zhurbas ◽  
Alexander Osadchiev ◽  
Pelagiya Belyakova
Keyword(s):  
Black Sea ◽  
Small Rivers ◽  
The Black Sea ◽  
Study Region ◽  
Marine Litter ◽  
Northeastern Part ◽  
Area Of Interest ◽  
Matter Transport ◽  
Coastal Sea ◽  
River Mouths

<p>This study is focused on delivery and transport of floating marine litter, which is carried by river discharge to coastal sea. This floating matter initially is contained in river plumes and its transport is governed by river plume dynamics. Despite the great importance of understanding the fate of floating marine litter (including plastic litter) in the sea, many aspects of its transport and accumulation remain unstudied. In this study we consider a large flood which happened in the northeastern part of the Black Sea in October 2018. A high resolution circulation model with a non-uniform horizontal grid (the grid bin length is decreased up to 200 m in a local area of interest) is applied to simulate transport of floating matter brought into the sea by overflowing rivers. The floating matter transport is modelled by horizontal advection of Lagrangian particles seeded in the mouths of main rivers of the study region in proportion to the actual river runoff. The particles that originated from different river mouths merge together on a horizontal velocity convergence line. These areas of accumulated marine litter remain stable during several days and are transported off the river mouths by a quasi-geostrophic alongshore current. However, some of the particles are trapped in the surf zone and form irregular contamination of the shoreline depending on local circulation features controlled by bottom topography and local wind forcing.  </p>

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