scholarly journals Records of Polydora cornuta and Streblospio gynobranchiata (Annelida, Spionidae) from the Black Sea

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.  

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 %.


Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1646 ◽  
Author(s):  
F. Tiralongo ◽  
R. Baldacconi

Microlipophrys adriaticus (Steindachner & Kolombatovic, 1883) is an endemic blenny of the Mediterranean Sea. It is also known from the Sea of Marmara and the Black Sea. However, unlike other species of combtooth blennies, M. adriaticus is a fish with a limited distribution in Adriatic Sea, especially in the north, where it can be common. We report here the first record of this species from the waters of the Ionian Sea.


2020 ◽  
Vol 5 (1) ◽  
pp. 64-77
Author(s):  
L. I. Ryabushko ◽  
A. V. Bondarenko

Mud volcanoes are one of unique natural phenomena widely spread around the world. They can be found in Crimea, including the Bulganak sopochnoe field – the largest cluster of active mud volcanoes on the peninsula (45°25′29.04″N, 36°27′51.64″E). Study of mud volcano microalgae in Crimea, as well as in other regions of Russia, has not been conducted so far. Therefore, scientific interest is caused by need and urgency of the study of these volcanoes. First data on microalgae species composition of active mud volcanoes are presented in this article. Samples collected by O. Yu. Eremin (03.08.2012 and 13.04.2013) in the upper 2–3-cm layer of suspension and in surface water were investigated. The ranges of salinity and water temperature were 27–32 g per L and +28…+31 °C, respectively. Microalgae species composition was determined in water preparations using Axioskop 40 (Carl Zeiss) light microscope at magnification of 10×40 with software AxioVision Rel. 4.6. Totally 16 taxa were found: Cyanobacteria (1), Dinophyta (2), Bacillariophyta (6), and Euglenophyta (7). Of these, cyanobacteria Chamaecalyx swirenkoi (Schirshov) Komárek et Anagnostidis, 1986 was found by us in the mud volcano in August 2012. Pennate species of diatoms were also identified – single living (of genera Cylindrotheca (Ehrenberg) Reimann & J. C. Lewin, Lyrella Karajeva, and Nitzschia Hassall) and colonial species (of genera Berkeleya Greville and Pseudo-nitzschia H. Peragallo). The brackish-water, benthic, boreal-tropical species Nitzschia thermaloides Hustedt was recorded for the algal flora of Crimea, the Black Sea, and the Sea of Azov for the first time. Euglenophytes were also found in the samples – 5 species of the genus Trachelomonas Ehrenberg and 2 species of the genus Strombomonas Deflandre. Of all the species found in the mud volcano ecotope, 7 species are common for the Black Sea, and 9 species, including 3 euglenophytes, are common for the Sea of Azov. It is shown that by characteristics of halobility, species found in the mud volcano belong to freshwater complex (53 %), with a significant share of marine (27 %) and brackish-water (20 %) species. Of the phytogeographic flora elements, boreal species make up 33 %, boreal-tropical – 47 %, and cosmopolites – 20 %. Three species of potentially toxic algae are recorded: diatom Pseudo-nitzschia prolongatoides (Hasle) Hasle, 1993, as well as dinophytes Prorocentrum lima (Ehrenberg) Dodge, 1975 and Alexandrium tamiyavanichii Balech, 1994. The last species is marine, boreal-tropical, and new to the algology of Crimea, the Black Sea, and the Sea of Azov. In the article, own and literary data on morphology, ecology, and phytogeography of species, as well as on their general distribution in different waterbodies of the world, are also presented. Some microalgae species are indicators of saprobity; they are able to participate in purification of water from organic substances. Photos of mud volcanoes and micrographs of some species are presented.


2018 ◽  
Vol 3 (4) ◽  
pp. 14-28 ◽  
Author(s):  
I. P. Bondarev

The name Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) is generally used for the only Pectinidae representative inhabiting the Black Sea. It is registered in the Red Book of the Republic of Crimea as endemic subspecies reducing in amount. F. glaber ponticus is listed in WoRMS MolluscaBase as the only accepted subspecies of Flexopecten glaber (Linnaeus, 1758). In the past its taxonomic status has been changed from a geographic variety to valid species. The purpose of this study is to establish its correct taxonomic status. The study is based on a comparative analysis of conchological features of Flexopecten glaber and F. glaber ponticus in relation with the brief natural history of population in the Black Sea. Sampling was performed by snorkel equipment in Kazach’ya Bay (Black Sea, Crimea, Sevastopol) at 2–6 m depths. A total of 100 scallop specimens were sampled in September 2017. To assure a better understanding in a broader context those results are compared with the previously published morphological data based on the analysis of a large amount of material from the Black Sea and the Mediterranean Sea – Marmara Sea regions. Comparative analysis of conchological features of F. glaber ponticus from the Black Sea with F. glaber from the Mediterranean region has not revealed any distinct differences between them. Thus, there are no evidenced data for the diagnosis of F. glaber ponticus as a subspecies. Species F. glaber appeared in the Black Sea not earlier than 7,000 years ago and formed a well developed population less than 3,000 years ago. We have to conclude that the specified divergence period is not long enough to form a subspecies. As a result of the present survey the subspecific status of F. glaber ponticus is not retained and the name is placed in synonymy of the parent species Flexopecten glaber.


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.


2020 ◽  
Vol 2 (1) ◽  
pp. 56-61
Author(s):  
MOHAMMAD SALMASIZADEH ◽  

The conflict between the Russian and Turkish in 1877-1878, though formed on the pretext of Russia's support for Christian nations under the rule of the Ottoman Empire, was actually part of the great scheme that European governments had begun to break up the Ottoman Empire and resolve the Eastern Question. The goals of these powers for world domination, that would sometimes results in wars among themselves, were mainly focused on expanding the territorial realm and winning economic gains. These goals were followed under the disguise of gaining freedom for Christians and securing independence for non-Turkish nations. The scientific and technological impairment of the Ottoman Empire compared to the European countries, accompanied by internal rivalries and frequent overthrow of the rulers, were some of the main weaknesses of the Ottoman state causing their demise. In the meantime, Russia was in pursue of its policy of territorial expansion and seeking access to warm waters. Russia's main objective was to obtain access to the Black Sea and the Mediterranean Sea. Having control over the Straits of Bosporus and Dardanelles that were under the rule of the Ottoman Empire would have connected Russia to the center of world trade in the Mediterranean and would have freed Russia from its land blockages and frozen ports. The causality, the start, and the ramifications of these wars have been reflected in the Iranian historiography of that era. Mohammad Hassan Khan Etemad al-Saltanah, a great historian of the Nasereddin Shah Qajar Age (1848-1898), using the reports of Iranian officials in Russia and the Ottoman Empire, and two books of Montazame Nasseri and Merat al-Boldan that were translations of selected articles from the French and Ottoman newspapers have recorded this important historical event. The reasons for Iranian attention to this historical event forms part of the modern and global historiography of Iran, in which attention to the developments in the Ottoman Empire plays an important role in Iran's acquaintance with modern civilization.


Author(s):  
Paulo S. Young ◽  
Helmut Zibrowius ◽  
Ghazi Bitar

The geographic distribution of Verruca stroemia and V. spengleri are reviewed. Verruca stroemia ranges from the White, Barents, Norwegian, and North Seas south to Portugal to the Algarve and to Gorringe Bank. All of the records of this species from the Mediterranean Sea are considered to be V. spengleri. Verruca spengleri occurs in the Azores and Madeira archipelagos, in southern Spain (Cádiz), throughout the Mediterranean Sea from Gibraltar to Lebanon, and in the Black Sea. But a distinct deep-water Verruca species seems to occur in the deep Mediterranean.


2021 ◽  
Author(s):  
Roman Sedakov ◽  
Barnier Bernard ◽  
Jean-Marc Molines ◽  
Anastasiya Mershavka

<p>The Sea of Azov is a small, shallow, and freshened sea that receives a large freshwater discharge. Under certain external forcing conditions brackish water from the Sea of Azov flow into the north-eastern part of the Black Sea through the narrow Kerch Strait and form a surface-advected buoyant plume. Water flow in the Kerch Strait also regularly occurs in the opposite direction, which results in the spreading of an advected plume of saline and dense water from the Black Sea into the Sea of Azov. Using a regional Black Sea Azov Sea model based on NEMO we study physical mechanisms that govern water exchange through the Kerch Strait and analyze the dependence of its direction and intensity on external forcing conditions. We show that water exchange in the Kerch Strait is governed by a wind-induced barotropic pressure gradient. Water flow through the shallow and narrow Kerch Strait is a one-way process for the majority of the time. Outflow from the Sea of Azov to the Black Sea is induced by moderate and strong northerly winds, while flow into the Sea of Azov from the Black Sea is induced by southerly winds. The direction and intensity of water exchange have wind-governed synoptic and seasonal variability, and they do not depend on the variability of river discharge rate to the Sea of Azov on an intraannual timescale.</p>


Author(s):  
E. A. Tikhonova ◽  

As part of the 113th cruise of the R/V “Professor Vodyanitsky”, research was conducted on organic pollution of bottom sediments in the coastal areas of Crimea and the Caucasus, as well as the water area in front of the Kerch Strait. Concentration of chloroformextractable substances was determined by the weight method and that of petroleum hydrocarbons was determined using infrared spectrometry. Both in 2020 and 2016 (the 83d cruise of the R/V “Professor Vodyanitsky”), properties of the bottom sediments of the Crimean and Caucasian coasts were typical of the marine soils of this region. This indicates that the studied water areas are generally in good condition. In accordance with the regional classification of bottom sediment pollution, the maximum concentrations of chloroform-extractable substances obtained for both the Black Sea and the Sea of Azov coast indicate pollution level III (23% of analysed samples). These values were found in bottom sediments in the Sevastopol water area (225 mg·100 g-1), in the coastal area of Cape Tarkhankut (120 mg·100 g-1) and Karadag (120 mg·100 g-1), the southern part of the Sea of Azov (125 mg·100 g-1) and Tuapse (110 mg·100 g-1). The content of chloroform-extractable substances in bottom sediments off the Black Sea coast of the Caucasus and the Sea of Azov coast is slightly lower than that off the Crimean coast. Pollution level II is assigned to bottom sediments in 46 % of the samples, with an average concentration of 72 mg·100 g-1 of air-dry solids. The rest (31 %) of the studied area was classified as conditionally clean (pollution level I, i. e. less than 50 mg·100 g-1). There has been a slight increase in the concentration of petroleum hydrocarbons in the bottom sediments of both the Black Sea and the Sea of Azov and their share in the total amount of chloroformextractable substances. In general, the level of pollution of bottom sediments by organic matter remained unchanged if compared with previous years, in particular with the data from 2016


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