New Results on the History of the Sea of Azov in the Holocene

2019 ◽  
Vol 489 (1) ◽  
pp. 1339-1344
Author(s):  
G. G. Matishov ◽  
V. V. Polshin
2020 ◽  
pp. 92-106
Author(s):  
A. Kudryachenko

The article analyzes the three stages of the migration of the German ethnic group into the territory of modern Ukraine, different in nature, character and orientation, and their features are clarified. The author reveals the geography of the first migratory flows of the Goths in the second half of the II century, which went from the Wisla delta to Scythia, and were divided into the western (settled on the right bank of the Dnieper) and eastern. The latter, having settled down near the Sea of Azov, founded the state of Germanarich, and in the IV century, under the pressure of the Huns, the center of life of Goths moved to the Kerch Peninsula, the mountainous region of Crimea, where their state association Gothia existed until the XVIII century. It turns out that in the early Middle Ages there was a second wave of German settlements on modern Ukrainian lands from the West European direction. The expansion of the settlements of Germans and immigrants from other European countries on the lands of Kievan Rus was facilitated by political relations, which were also realized with the help of dynastic marriage unions. The princes of Kiev, pursuing a foreign policy worthy of a great power, have equal relations with the main European states of the medieval world - the Holy Roman Empire (Germany) and Byzantium, they invite priests, German craftsmen and merchants. Starting from the XI century, small German trade colonies appeared in Kiev, Vladimir-Volynsky, Lutsk and other cities. During the Lithuanian-Polish period, the influx of German settlers to Ukrainian lands is increasing. This was facilitated by various benefits and provision of points to the German immigrants by Lithuanian princes and Polish kings. In the fourteenth and fifteenth centuries, Magdeburg law was acquired by large trading cities. The third period, the most significant resettlement and colonization, that is, large-scale development of the South of Ukraine - the Sea of Azov, the Black Sea region and the lands of Crimea - begins in the second half - the end of the 18th century. The author emphasizes that this most powerful period and the great positive history of the development of our region is largely connected with immigrants of German origin (and representatives of other ethnic groups). This period becomes a powerful colonization and economic development of the entire South of Ukraine, the rich land of the Azov, Black Sea, Crimea. It is noted that then, on the initiative and real support of the government of tsarist Russia, the development of wide steppe spaces took place, which, together with Ukrainian lands, had recently been transferred to the Russian Empire. Since then, the history of immigrants has become part of the history of the Ukrainian people. The dynamics of the development of German colonies in different provinces of the South of Russia is analyzed separately, the social aspects of the life of settlements, the grave consequences for the colonists associated with the First World War, and revolutionary events in the Russian Empire are indicated. The gains and losses in the national development, in the arrangement, in the administrative division of the German and other settlers, which were the consequences of radical fluctuations in the national policy of the Soviet government in the pre-war period, are revealed.


2013 ◽  
Vol 14 (2) ◽  
pp. 261 ◽  
Author(s):  
V.I. RADASHEVSKY ◽  
Z.P. SELIFONOVA

Two spionid polychaetes, Polydora cornuta and Streblospio gynobranchiata, were identified in benthic samples collected in the northern Black Sea and adjacent waters. These species have earlier been classified as the worst invaders in soft bottom communities in the Mediterranean Sea. Polydora cornuta had been previously misidentified and widely reported from the Black Sea and the Sea of Azov as P. ciliata, P. ciliata limicola and P. limicola. Streblospio gynobranchiata is a new invader currently extending its distribution into the Mediterranean, Black and Caspian Seas. Morphology, diagnostic characters and biology of the species are discussed and the history of their records in the Mediterranean, Black and Caspian Seas and the Sea of Azov is reviewed.  


2017 ◽  
Vol 51 ◽  
pp. 37-56 ◽  
Author(s):  
R. M. Gogorev ◽  
G. V. Kovaleva

New data on morphology of 10 Thalassiosira species from the Holocene deposits of the Sea of Azov are presented. The new species, Thalassiosira azovica Gogorev et Kovaleva, sp. nov., is described. It is very similar to T. latimarginata and T. trifulta and differs mainly by presence of scattered strutted processes on the valve face. Two species, T. allenii and T. mediterranea, are first recorded for the Sea of Azov and Russia. Furthermore, they are first found in fossils as well as T. incerta and T. proschkinae.


2019 ◽  
Vol 489 (2) ◽  
pp. 190-194
Author(s):  
G. G. Matishov ◽  
V. V. Polshin

The paper analyzes the results of integrated studies, obtained in the recent years, of bottom sediments and coastal transects in the Sea of Azov. The changes of natural conditions, taking place in its sea basin during the last 20 thousand years, are coordinated with the chronology of the World Ocean level fluctuations. The stages of the sea level increase, caused by the glacier shields melting, are considered. Due to the fact, it is noted that the change of the level of the World Ocean made a decisive impact on the formation of the Sea of Azov current water area conditions.


2021 ◽  
Vol 498 (1) ◽  
pp. 436-440
Author(s):  
G. G. Matishov ◽  
L. V. Dashkevich ◽  
E. E. Kirillova

2021 ◽  
Author(s):  
Yury Fedorov ◽  
Andrey Kuznetsov ◽  
Irinageo Dotsenko ◽  
Anna Mikhailenko

<p>The majority of researches of the Working group on the ‘Anthropocene’ of the International Commission on Stratigraphy (ICS) voted for the recognition of the Anthropocene as a formal chrono-stratigraphic unit characterized by profound alterations of several conditions and processes on Earth by human impact. It is also proposed to place its beginning and the end of the Holocene epoch in the mid-20th century, coinciding with the launch of nuclear weapon tests [1]. In contemporary sediment cores of the Sea of ​​Azov, the Don and the Kuban rivers, we will distinguish a "layer of anthropogenic impact", meaning the layer containing considerable quantities of technogenic material and (or) pollutants [2]. To reveal the chronology of its formation, its thickness, and boundaries, it is proposed to use the results of layer-by-layer determining of the Cs-137 and Am-241 specific activities, as well as the content of oil components, lead and mercury in the bottom sediments of the water bodies. The upper Cs-137 peak formed due to the Chernobyl accident and sometimes the lower Cs-137 and Am-241 peaks related to the global radioactive fallout in the 1950s and 1960s have been detected [3]. The decrease of mercury, lead, and oil components concentrations from the upper to the lower parts of sediment cores has also been observed. The results of analysis of technogenic radionuclides and priority pollutants distribution have proved that since the 1950s and 1960s in the bottom sediments of the Sea of ​​Azov and water bodies of its basin the “layer of anthropogenic impact" has been being formed. Its thickness varies from 20 to 50 cm and may even exceed 50 cm in areas characterized by high sedimentation rates. It has been found out that in the mid-20th century the ecosystem of the Sea of ​​Azov began to suffer from intense anthropogenic pressure, which reached its maximum in the 1970s and 1980s. It is proposed to consider the studied pollutants (technogenic radionuclides, mercury, lead, and oil components) as a possible set of priority markers of the Anthropocene epoch. The Holocene - Anthropocene boundary should be placed at the base of the identified “layer of anthropogenic impact”.</p><p> </p><p>The research was supported by the Russian Foundation for Basic Research, project no. 19-05-50097.</p><p> </p><p>Bibliography</p><p>[1] Working Group on the ‘Anthropocene’. Results of binding vote by AWG. http://quaternary.stratigraphy.org/working-groups/anthropocene/ (last accessed 17 January 2021).</p><p>[2] Kuznetsov A.N., Fedorov Yu.A., and Yaroslavtsev V.M. (2018) Technogenic and natural radionuclides in the bottom sediments of the Sea of Azov: regularities of distribution and application to the study of pollutants accumulation chronology. IOP Conference Series: Earth and Environmental Science 107, 012063.</p><p>[3] Fedorov Yu.A., Kuznetsov A.N., and Trofimov M.E. (2008) Sedimentation rates in the Sea of Azov inferred from Cs-137 and Am-241 specific activity. Doklady Earth Sciences, vol. 423, no. 1, pp. 1333-1334.</p>


2018 ◽  
Vol 52 (1) ◽  
pp. 33-61
Author(s):  
R. M. Gogorev ◽  
G. V. Kovaleva ◽  
A. V. Nazarenko

New data on morphology of 7 infraspecific taxa of Actinocyclus octonarius, frequently found in the Holocene deposits of the Sea of Azov, are presented. New species A. pseudopodolicus Kovaleva et Gogorev, sp. nov., and variety A. octonarius var. tonsura Kovaleva et Gogorev, var. nov. are described. They are similar to varieties of A. octonarius and some other Actinocyclus species but differ from them in presence of curved fascicules of areolae in A. pseudopodolicus and hyaline ring on valves of A. octonarius var. tonsura.


Oceanology ◽  
2021 ◽  
Vol 61 (4) ◽  
pp. 533-542
Author(s):  
G. G. Matishov ◽  
V. V. Polshin ◽  
E. P. Kovalenko ◽  
K. S. Grigorenko

2021 ◽  
Vol 55 (1) ◽  
pp. 35-54
Author(s):  
G. V. Kovaleva ◽  
R. M. Gogorev ◽  
A. V. Nazarenko

New data on the morphology of Thalassiosira incerta, one of the most abundant species of the genus Thalassiosira in the Holocene deposits of the Sea of Azov, are presented. New varieties, T. incerta var. strelnikovae Kovaleva et Gogorev, var. nov. and T. incerta var. fluvialis Gogorev et Kovaleva, var. nov., are described. They are orphologically similar to the type and differ mainly by the presence of a rosette of large areolae around the central fultoportulae and the areolae density on a valve.


2019 ◽  
Vol 4 (1) ◽  
pp. 45-62
Author(s):  
G. V. Zuyev

European anchovy Engraulis encrasicolus L. is one of the most abundant fish species in the Sea of Azov – Black Sea basin. Historically it is the main commercial fish in all Black Sea countries. In modern conditions, the share of anchovy catches totals 80–85 %. In recent years (since 2001) the average annual catch was 250 tones. E. encrasicolus is a polytypic species. In the Black Sea and in the Sea of Azov there are two intraspecific forms – Black Sea anchovy (E. encrasicolus ponticus Alex.) and Sea of Azov anchovy (E. encrasicolus maeoticus Pusanov), and their taxonomic status is still unclear. An actual task is the assessment of the current population structure of E. encrasicolus and its possible changes under the influence of climatic and anthropogenic factors in order to develop the necessary measures to prevent negative impacts and to preserve the resource potential of the species. This work focuses on the study of European anchovy modern population structure in the Black Sea and the Sea of Azov, the geological and paleoclimatic conditions of its formation and assessment of possible changes taking into account real natural and anthropogenic risk factors. The work is based on the research results of intraspecific morphobiological, biochemical, genetic and ecological variability of E. encrasicolus, as well as spatial and reproductive relationships between Sea of Azov anchovy and Black Sea anchovy. Investigations concerned with the study of intraspecific heterogeneity problem of E. encrasicolus in the Black Sea and in the Sea of Azov were reviewed. Data obtained by domestic and foreign authors for a 100-year period (1913–2014) were analyzed; the list of publications includes more than 40 titles. Our own research results were also used in the work. The information about reproductive area boundaries of Sea of Azov anchovy and Black Sea anchovy was systematized and summarized. Their reproductive areas were found to be distributed over the entire water area of the Black Sea and the Sea of Azov and overlapped over the whole space. The absence of spatially separate reproductive areas and the presence of simultaneous spawning exclude belonging of Black Sea anchovy and Sea of Azov anchovy to different subspecies (geographical races). Population level of the differences between Black Sea anchovy and Sea of Azov anchovy was confirmed by the results of genetic and biochemical studies: the coefficients of genetic similarity and genetic distance between them were 0.9983–0.9985 and 0.0015–0.0017, respectively. Geological history of population structure formation of Engraulis encrasicolus was presented. Modern Sea of Azov anchovy and Black Sea anchovy in the past were spatially separated and came into contact again only after appearance of a number of differences between them in the course of evolution. Their isolation occurred in the newly formed Sarmatian Sea isolated from the Tethyan Ocean in the Miocene (23.0–5.3 million years ago). As a result, two geographically isolated and independent anchovy groups (western and eastern) appeared. Further development of these groups occurred at different rates. Faster rates of evolution of the western group led to the formation of more progressive Black Sea anchovy and Mediterranean anchovy, lower rates of evolution of the eastern group led to the formation of more primitive Sea of Azov anchovy. Only in the modern era, after the last glacial period had ended and the connection of the Black Sea with the Mediterranean Sea had been reconstituted (7–5 thousand years ago) Sea of Azov anchovy and Black Sea anchovy contacted, the process was followed by their subsequent hybridization, i. e. by the appearance of the zone of secondary intergradation. There is a real threat of Sea of Azov anchovy genofund destruction and its “genetic absorption” by Black Sea anchovy in conditions of introgressive hybridization in recent decades associated with salinity increase of the Sea of Azov caused by human economic activity. Nevertheless, the genetic uniqueness of Sea of Azov anchovy persists to the present, first of all, due to ecological isolation mechanisms – seasonal isolation (timing) and biotope isolation (site selection) during the reproductive period. А certain pattern of redistribution in the spawning population composition of Sea of Azov anchovy and Black Sea anchovy females was identified: the share of Sea of Azov anchovy females decreased while the share of Black Sea anchovy females increased. Thus, Sea of Azov anchovy and Black Sea anchovy populations are the “temperature” races adapted to different reproductive temperature conditions: Sea of Azov anchovy – to lower temperature conditions, Black Sea anchovy – to higher ones. In addition to seasonal isolation, the biotopic isolation of Black Sea anchovy and Sea of Azov anchovy was found. Black Sea anchovy prefers to spawn in open areas of the Black Sea with water salinity above 16 ‰: its share is here 55–60 %, whereas in the coastal waters its share does not exceed 5–40 %. Sea of Azov anchovy, on the contrary, in spawning period prevails in the coastal freshened waters with salinity below 15 ‰, with its share here reaching 60–90 %.


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