Late Cretaceous-Eocene marginal seas in the Black Sea-Caspian region: Paleotectonic reconstructions

Geotectonics ◽  
2006 ◽  
Vol 40 (3) ◽  
pp. 169-182 ◽  
Author(s):  
V. G. Kaz’min ◽  
N. F. Tikhonova
Author(s):  
Alexandr S. Levchenkov ◽  

The article analyzes the influence of the concepts of the Intermarium and the Baltic-Black Sea Arc on the formation of Ukraine’s foreign policy in 1990 – early 2000. The use of these concepts in American, European and Ukrainian geopolitical thought, which historically included the idea of opposing Russian influence in the region, contributed to the increase in tension and was aimed at further disintegration of the Western flank of the post-Soviet space. The article proves that the design of the Euro-Atlantic vector of Ukraine’s foreign policy was already active under the first two Ukrainian presidents – Leonid Kravchuk (1991–1994) and Leonid Kuchma (1994–2005). One of the concrete attempts to implement the idea of forming a common political, economic, transport and logistics space of the Black Sea-Caspian region with a promising expansion of the cooperation zone to the whole of Eastern Europe and the Eastern Baltic during the presidency of Leonid Kuchma was the foundation and launch of a new regional organization, Organization for Democracy and Economic Development, better known as GUAM (composed by the initial letters of names of member states – Georgia, Ukraine, Azerbaijan, Moldova; when Uzbekistan was also a member of Organization for Democracy and Economic Development, the name of the organization was GUUAM), which is an alternative to Eurasian projects with the participation of Russia.


Author(s):  
A.K. Akhmadiev ◽  
◽  
V.N. Ekzaryan

The paper notes that the hydrocarbon potential of the Black Sea-Caspian region is not exhausted, and therefore the development of its resources is intensifying. The exploitation of oil and gas fields is closely associated with negative consequences for theenvironment. Therefore, the geo-environmental features of the area must be studied and taken into consideration. In relation to the Black Sea-Caspian region the authors have identified and described such features as: the diversity of geopolitical, regional-geological, geographical conditions; the factor of stability of the geological environment; oil pollution of the marine environment and the organization of monitoring of oil pollution.


PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11001
Author(s):  
Yutaro Yamashita ◽  
Gustavo Sanchez ◽  
Kentaro Kawai ◽  
Satoshi Tomano ◽  
Hiroki Fujita ◽  
...  

The black sea bream Acanthopagrus schlegelii (Bleeker, 1854) is a commercially important species in Japanese waters. Assessing its population structure is essential to ensure its sustainability. In the Northwestern Pacific, historical glacial and interglacial periods during the Pleistocene have shaped the population structure of many coastal marine fishes. However, whether these events affected the population of black sea bream remains unknown. To test this hypothesis and to assess the population structure of black sea bream, we used 1,046 sequences of the mitochondrial control region from individuals collected throughout almost the entire Japanese coastal waters and combined them with 118 sequences from populations distributed in other marginal seas of the Northwestern Pacific Ocean. As in other coastal marine fish with similar distribution, we also found evidence that the glacial refugia on the marginal seas prompted the formation of three lineages in black sea bream. These lineages present signatures of population growth that coincided with the interglacial periods of the Pleistocene. While the origin of Lineages B and C remains unclear, the higher relative frequency of Lineage A in the southernmost location suggests its origin in the South China Sea. The non-significant pairwise ΦST and AMOVA of Japanese populations and the presence of these three lineages mixed in Japanese waters; strongly suggest that these lineages are homogenized in both the Sea of Japan and the Pacific Ocean. Our results indicate that the black sea bream should be managed as a single stock in Japan until the strength of connectivity in contemporary populations is further addressed using non-coding nuclear markers.


2020 ◽  
Author(s):  
Clay Campbell ◽  
◽  
Michael H. Taylor ◽  
Megan Mueller ◽  
Alexis Licht ◽  
...  

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