scholarly journals Biological and ecological characteristics of Pterocuma pectinata (Malacostraca, Cumacea) in Sasyk Reservoir

2016 ◽  
Vol 24 (1) ◽  
pp. 134-142
Author(s):  
А. A. Khalaim ◽  
M. M. Djurtubaev
Keyword(s):  
Black Sea ◽  
Practical Interest ◽  
Intermediate Stage ◽  
The Body ◽  
Size Group ◽  
The Black Sea ◽  
Regression Equations ◽  
The Caspian Sea ◽  
Kuibyshev Reservoir ◽  
Black Sea Region

Sasyk (Kunduk) – estuary in the North-Western Black Sea region, is located 120 kmsouth-west of Odessa. In 1979–1980 Sasyk was separated from the sea by a dam, connected by a canal with the Danube and transformed into a reservoir. The fauna of Sasyk underwent significant changes and continues to adapt to the new conditions. This process is of great theoretical and practical interest. Cumacea – a small order, numbering about 600 species; is represented in the Black Sea-Azov basin by 23 species, 11 of them belong to the Caspian complex. Due to their high quantity indicators, they play a significant role in the diet of many species of fish. Pterocuma pectinata (Sowinski, 1893) is the most abundant species of cumacean not only in the Sasyk Reservoir, but also in many bodies of water in the region. However, the biology and ecology of this group of animals has been very inadequately studied. The material for these studies was provided by 120 benthic samples collected from 41 stations in the Sasyk Reservoir in the vegetation period 2013–2014. In this study we also used the material collected by means of H. Hungerford underwater light traps. In total 4,000 specimens of cumaceans were processed. This article shows the results of the studyof the post-embryonic development, fertility and size-mass characteristic of P. pectinata in Sasyk Reservoir. For both sexes for age stages have been distinguished and described for cumaceans: «manca», youth, prebreeding and breeding. Between breeding cycles, females live through one more preparatory (intermediate) stage; the males die. This article provides a detailed morphological and morphometric description of all the stages of the ontogeny of cumaceans. The ratio of number of cumaceans at different stages of ontogeny varies considerably with the seasons. In the summer sexual development of cumacean occurs earlier than in the less warm seasons. A directly proportional relationship was found between body length and fertility of P. pectinata. With decrease in water temperature fertility increases. The corresponding regression equations were obtained. The maximum number of eggs observed in the spring of 2014 – 160 ind. in a female 8.0 mm in length (including the uropod length – 10.2 mm). Mean fecundity was 22 ± 1 and 21 ± 1 ind. in the summer of 2013 and 2014, 40 ± 2 and 32 ± 2 ind. in the autumn of 2013 and 2014, 72 ± 4 ind. in the spring of 2014; during the vegetation season 2014 – 42 ± 2 ind. The smallest oviparous female cumaceans (4–6 mm) were observed in the summer in both years of research with domination of the size group of 4–5 mm. The largest oviparous females (6.1–9.0 mm) were observed in the spring with domination of 6.1–7.0 mm size group. P. pectinata produces at least two generations per year in Sasyk Reservoir. P. pectinata reproduction occurs from March to the beginning of November. The peak of breeding is in early spring (March – April), which contributes to the restoration of population numbers after hibernation. The second stage of reproduction (October – November) is less intense. The lifespan of P. pectinata in the Sasyk Reservoir is about one year. Dependence of individual weight of the body is directly proportional to the length of P. pectinata and varies with the seasons. This article provides a table of the average "size – weight" of cumaceans. The data in this table can be used in ichthyological studies, namely the calculation of the reconstructed weight of the food item – P. pectinata, by size of its undigested chitin skeleton. The maximal length of P. pectinata in Sasyk is 8.5 mm (including uropod length – 10.7 mm), weight – 5 mg, significantly greater than the values specified for the populations of the upper reaches of the Kuibyshev Reservoir and the Caspian Sea. The results of the study significantly complement the existing knowledge of biology and ecology of P. pectinata, and expands our idea of the state of the ecosystem of the Sasyk Reservoir. 

Climatostratigraphic Scheme of the Black Sea Pleistocene and its Correlation with the Oxygen-Isotope Scale and Glacial Events

1988 ◽  
Vol 29 (1) ◽  
pp. 1-24 ◽  
Author(s):  
V.A. Zubakov
Keyword(s):  
Black Sea ◽  
Saline Water ◽  
Magnetic Polarity ◽  
The Black Sea ◽  
The Caspian Sea ◽  
Black Sea Region ◽  
Marine Terraces ◽  
Molluscan Fauna ◽  
New Evidence ◽  
A New Species

New evidence from the Asov Sea-Black Sea region shows that after the Cobb Mountain magnetic event (1.1 myr) there were 8 saline water events, with Mediterranean molluscs penetrating into the Asov Sea (five times farther than the western Manych Strait), and 7 or 10 cold freshwater events. During the freshening phase, the Caspian Sea molluscan fauna penetrated into the Black Sea; each time the Caspian mollusc assemblage was characterized by a new species of Didacna. Thus, some 18–20 bioclimatostratigraphic units can be distinguished in the Asov Sea-Black Sea section for the last 1 myr. Their numerical age is estimated by some dozen thermoluminescence dates and 12 magnetic-polarity datum planes. The Karangatian s. lato corresponds to the interval 300,000–50,000 yr, the Uzunlarian to 580,000–300,000 yr, and the Chaudian to 1,100,000–600,000 yr. The Karangatian and Tyrrhenian marine terraces correspond to marine isotope stages 5 and 7, the Uzunlarian and Milazzian to stages 11–15, and the Chaudian and Sicilian to stages 16–28. The number and ages of glacial-interglacial cycles in continental Europe are identical to the climatic cycles in the Black Sea and Mediterranean.

scholarly journals Asymmetrical warfare Strategy and its Implications to the Black Sea Regional Security in 21st Century: Non-State Aggressive Actors and Terrorism

2020 ◽  
pp. 63-89
Author(s):  
Vakhtang Maisaia ◽  
Magdana Beselia
Keyword(s):  
Black Sea ◽  
Security Policy ◽  
Armed Forces ◽  
Regional Security ◽  
Dominant Factor ◽  
The Black Sea ◽  
The Caspian Sea ◽  
Black Sea Region ◽  
Conflict Zone ◽  
Military Politics

Today, military politics have became a dominant factor in the aegis of the contemporary international and regional security, and this provision is also relevant in the Black Sea Region. The nature of military politics presupposes the existence of asymmetric threats, which is revealed in the implementation of functional politics by the states and implies the following components: power, chance, astonishment, armed forces, their doctrines, and armaments. The asymmetric military identification is vital to recognize at the regional level, with the example of the Black Sea Region and it’s involvement of so-called ‘Non-State Aggressive Actors’ (DAESH, Al-Qaeda, etc.). After the Russian annexation of Crimea, the Black Sea Region would be designated as a conflict zone and therefore NATO has reinforced it’s eastern security policy accordingly. The International Community witnessed that there are two regional hegemons: Russia and Turkey, pursuing their own geopolitical and economic interests in the Black Sea region and the region around the Caspian Sea (including one that sees regional power interests). Recently, China, as a global power in its own right, with its ‘One Belt and One Road’ Initiative (OBOR), expresses it’s own interests toward the region,

Obsidian Exchange Networks in Prehistoric Anatolia: New Data from the Black Sea Region

Paléorient ◽  
2013 ◽  
Vol 39 (2) ◽  
pp. 173-182
Author(s):  
Bleda S. Düring ◽  
Bernard Gratuze
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Exchange Networks ◽  
Black Sea Region

The referendum as an institution in the Black Sea Region: Does it signal the rise or collapse of democracy?

2019 ◽  
Vol 17 (4) ◽  
pp. 161-185
Author(s):  
Małgorzata Podolak
Keyword(s):  
Black Sea ◽  
Direct Democracy ◽  
The Black Sea ◽  
Moral Issues ◽  
Black Sea Region ◽  
Positive Effects ◽  
The Subject ◽  
Democratic Systems ◽  
Important State ◽  
Constitutional Changes

Views on the institution of direct democracy have changed during the period of democratic transition. The various advantages and positive effects of direct democracy have been confirmed by the practice of some democratic countries. Its educational and political activation value for society was also noted, without which civil society cannot form. The referendum is especially treated as the purest form of correlation between the views of society and the decisions of its representatives. In a situation where two representative bodies are present – the parliament and the president – a referendum is considered a means of resolving disputes between them in important state affairs. The referendum is nowadays becoming more than just a binding or consultative opinion on a legislative act, especially a constitution. First and foremost, it is important to see the extension of the type and scope of issues that are subject to direct voting. Apart from the traditional, i.e., constitutional changes, polarising issues that raise considerable emotion have become the subject of referenda. Problems of this type include, in particular, moral issues, membership in international organisations, and so-called ‘New Policy’. This article presents the role and importance of the referendum as an institution shaping the democratic systems of the Black Sea Region.

Analysis of potential seismic sources of tsunamis in the Black Sea region, using data from various catalogues

2021 ◽  
Author(s):  
Emil Oynakov ◽  
Liliya Dimitrova ◽  
Lyubka Pashova ◽  
Dragomir Dragomirov
Keyword(s):  
Black Sea ◽  
Scientific Evidence ◽  
Active Faults ◽  
Active Regions ◽  
The Black Sea ◽  
Earthquake Catalogues ◽  
Crimean Peninsula ◽  
Black Sea Region ◽  
Global Science ◽  
Using Data

<p>Low-laying territories along the Black Sea coastal line are more vulnerable to the possible high (long) waves due to tsunami events caused by strong earthquakes in the active seismic regions. Historically, such events are rare in the Black Sea region, despite some scientific evidence of tsunamis and their recordings through continuous sea-level observations with tide gauges built in certain places along the coast. This study analyses seismic data derived from different international earthquake catalogues - NEIC, ISC, EMSC, IDC and Bulgarian national catalogue (1981 - 2019). A catalogue of earthquakes within the period covering the historical to the contemporary seismicity with magnitudes M ≥ 3 is compiled. The data are processed applying the software package ZMAP, developed by Stefan Wiemer (http://www.seismo.ethz.ch/en/research-and-teaching/products-software/software/ZMAP/index.html). The catalogues' completeness is calculated to assess the reliability of the historical data needed to assess the risk of rare tsunami events. The prevailing part of the earthquakes' epicentres are in the seismically active regions of Shabla, the Crimean peninsula, the east and southeast coast of the Black Sea forming six main clusters, which confirmed previous studies in the region. In these areas, several active and potentially active faults, which can generate tsunamigenic seismic events, are recognized.</p><p><strong>Acknowledgements: </strong>The authors would like to thank the Bulgarian National Science Fund for co-funding the research under the Contract КП-СЕ-КОСТ/8, 25.09.2020, which is carried out within framework of COST Action 18109 “Accelerating Global science In Tsunami HAzard and Risk analysis” (AGITHAR; https://www.agithar.uni-hamburg.de/).</p>

Georgian Historians and the Ideological Confrontation Between East and West

2021 ◽  
Vol 30 (1) ◽  
pp. 153-164
Author(s):  
George Gotsiridze
Keyword(s):  
Soviet Union ◽  
Cultural Values ◽  
Black Sea ◽  
The Black Sea ◽  
Black Sea Region ◽  
The Soviet Union ◽  
Long Time ◽  
Science And Culture ◽  
East And West

The work, on the one hand, highlights the mission of Europe, as an importer of knowledge, which has for centuries been the center of gravity for the whole world, and, on the other hand, the role of the Black Sea Region, as an important part of the Great Silk Road, which had also for a long time been promoting the process of rap-prochement and exchange of cultural values between East and West peoples, until it became the ‘inner lake’ of the Ottoman Empire, and today it reverts the function of rapproching and connecting civilizations. The article shows the importance of the Black Sea countries in maintaining overall European stability and in this context the role of historical science. On the backdrop of the ideological confrontation between Georgian historians being inside and outside the Iron Curtain, which began with the foundation of the Soviet Union, the research sheds light on the merit of the Georgian scholars-in-exile for both popularization of the Georgian culture and science in Eu-rope and for importing advanced (European) scientific knowledge to Georgia. Ex-change of knowledge in science and culture between the Black Sea region and Europe will enrich and complete each other through impact and each of them will have unique, inimitative features.

Synagogue as Infrastructure in Everyday Life of Batumi Jewish Community

2021 ◽  
Vol 14 (3-4) ◽  
pp. 323-338
Author(s):  
Nino Abakelia
Keyword(s):  
Everyday Life ◽  
Jewish Community ◽  
Black Sea ◽  
The Black Sea ◽  
Culturally Specific ◽  
Sacred Place ◽  
Black Sea Region ◽  
The Subject ◽  
Ethnographic Data ◽  
And Function

Abstract The subject under scrutiny is Sephardic and Ashkenazi synagogues in Batumi (the Black Sea Region of Georgia) that reveal both universal and culturally specific forms. The paper is based on ethnographic data gathered during fieldwork in Batumi, in 2019, and on the theoretical postulates of anthropology of infrastructure. The article argues that the Batumi synagogues could be viewed and understood as ‘infrastructure’ in their own right, as they serve as objects through which other objects, people, and ideas operate and function as a system. The paper attempts to demonstrate how the sacred edifices change their trajectory according to modern conditions and how the sacred place is inserted and coexists inside a network of touristic infrastructure.

Identification and Morphological-Physiological Characterization of Astaxanthin Producer Strains of Haematococcus pluvialis from the Black Sea Region

2018 ◽  
Vol 54 (6) ◽  
pp. 639-648
Author(s):  
E. S. Chelebieva ◽  
N. V. Dantsyuk ◽  
K. A. Chekanov ◽  
I. N. Chubchikova ◽  
I. V. Drobetskaya ◽  
...  
Keyword(s):  
Black Sea ◽  
Haematococcus Pluvialis ◽  
The Black Sea ◽  
Black Sea Region ◽  
Physiological Characterization ◽  
Producer Strains
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