scholarly journals Phenotypic and sexual structure of Mytilus galloprovincialis Lam., cultivated on the mussel-oyster farm in the outer harbor of Sevastopol city (Crimea, Black Sea)

2018 ◽  
Vol 3 (3) ◽  
pp. 86-93 ◽  
Author(s):  
N. S. Chelyadina
Keyword(s):  
Sex Ratio ◽  
Black Sea ◽  
Mytilus Galloprovincialis ◽  
The State ◽  
Active Management ◽  
Significant Shift ◽  
Sexual Structure ◽  
Oyster Farm ◽  
Asynchronous Maturation ◽  
Black Color

Morphophysiological studies of hydrobionts, and, in particular, mussels cultivated in marine farms, become important for modern hydrobiology. The study of the phenotypic structure of the mussel settlements in the Black Sea is an important aspect of monitoring the state of the mollusk population in changing environmental conditions. Information about patterns of sex realization under certain conditions can be the basis for active management of settlement formation in the cultivation of mollusks. Data about the regularities of sexual maturation of mussels, the stages of maturity of gonads and gametes spawning are also of importance. The aim of the work was to assess the phenotype and sex structure of the mussel populations as well as the stages of gonads maturity of the mussel Mytilus galloprovincialis cultivated on the mussel-oyster farm located in the outer harbor of Sevastopol. Mussels with the size of the shell from 4.9 to 5.4 mm were collected monthly from March 2015 to August 2016 on the studied mussel-oyster farm. Phenotype, sex and stages of gonad maturity were determined in mollusks by standard methods. When determining the frequency of occurrence of mussel phenotype on the mussel-oyster farm, a higher percentage of mollusks with black color shells (Bl) in comparison with whose with brown color shells (Br) was observed, and on average for the studied period the shell phenotype ratio (Bl : Br) was 1.8 : 1 respectively. Data on the sexual structure of M. galloprovincialis on the studied mussel-oyster farm are presented. Average ♂ : ♀ ratio was 2.8 : 1, with the proportion of hermaphrodites reaching 1–6 %. The sex ratio was different every month. In March 2015 it was 1.7 : 1 (♂ : ♀) and by August 2015, while mollusks growing on the mussel’s collector, the share of males reached its maximum (8 : 1). After thinning the mussels on the collector, the sex ratio had stabilized by October 2015 and remained at the level of 2 : 1 until March 2016. The next subsidence of the young and increase of mussels mass on the collector had again led to a significant shift of the mussel sexual structure (7.5 : 1) by May 2016. One of the reasons of the increase in the number of males in the studied mussel-oyster farm is thought to be the high density of mussels in the druse resulting in local hypoxia and poor food accessibility. The analysis of the state of gonads maturity of cultivated mussels showed two peaks of spawning – spring (March, April) and a long autumn one (started in October and continued until early December). Mass reproduction of mussels was observed in the spring when the surface water layer warmed up to 9–12 °C and in the autumn with the decrease of water temperature to 18 °C. The asynchronous maturation of the gonads of M. galloprovincialis of both sexes was observed. Males had greater variability of maturity stages than females. The shift in the ratio of the sexes towards the increase of males share as well as the increase of the number of mussels with black color shell and also the asynchronous maturation of the gonads of M. galloprovincialis on the studied farm can be considered as the ecological and physiological response of mollusks to the environment changes.

scholarly journals SEX INVERSION IN CULTIVATED MUSSELS MYTILUS GALLOPROVINCIALIS LAM. (CRIMEA, BLACK SEA) UNDER INFLUENCE OF EXTERNAL ENVIRONMENTAL FACTORS

2018 ◽  
Vol 19 ◽  
pp. 26-31
Author(s):  
Natalya Chelyadina ◽  
Natalya Pospelova ◽  
Mark Popov ◽  
Ludmila Smyrnova ◽  
Irina Kharchuk ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Sex Ratio ◽  
Black Sea ◽  
Diesel Fuel ◽  
Hormonal Regulation ◽  
Anthropogenic Impact ◽  
Mytilus Galloprovincialis ◽  
The Black Sea ◽  
Sex Inversion ◽  
Anionic Detergents

In the last decade, there has been a shift in the sex ratio of the mussel Mytilus galloprovincialis in the Black Sea towards increase of males. In modern literature, focus is mainly on mechanisms of sex inheritance in mussels and hormonal regulation of the reproduction, and there is no information on sex inversion in M. galloprovincialis under the influence of environmental factors. The goal of this work is to establish the fact of sex change in mussels cultivated near the coast of Crimea under the influence of some external environmental factors. We establish that mussels change sex from female to male, but some specimens become hermaphrodites, with their fraction reaching 13%. Under unfavorable environmental conditions, mussel females change sex, and their mortality rises up to 69%. In water areas subject to anthropogenic impact, the proportion of sex inversion in the mollusks may be as high as 58%. The influence of various adverse   environmental factors on sex inversion in mussel females is unequal, and its strength decreases in the following order: diesel fuel > hypoxia > anionic detergents > starvation.

Total antioxidant capacity in the black mussel (Mytilus galloprovincialis) from Black Sea coasts

2004 ◽  
Vol 59 (3) ◽  
pp. 475-484 ◽  
Author(s):  
S. Moncheva ◽  
S. Trakhtenberg ◽  
E. Katrich ◽  
M. Zemser ◽  
I. Goshev ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Black Sea ◽  
Total Antioxidant Capacity ◽  
Mytilus Galloprovincialis ◽  
Total Antioxidant

scholarly journals ENERGY PROJECTS CONNECTING AZERBAIJAN AND GEORGIA

2018 ◽  
pp. 30-35
Author(s):  
S. Habibbayli
Keyword(s):  
Natural Gas ◽  
Black Sea ◽  
Caspian Sea ◽  
The State ◽  
Gas Pipeline ◽  
Energy Resources ◽  
Oil Companies ◽  
Transit Country ◽  
Energy Projects ◽  
Pipeline Project

After the restoration of the state independence of Azerbaijan, one of the main goals was to use natural resources freely, in the interests of the Azerbaijani people and state. Since the early 1990’s, several western companies have begun to show interest in the energy sources of the Caspian region. In the first years of independence, certain steps were taken to obtain energy resources and bring them to the world market. The “Contract of the Century” concluded on September 20, 1994, with 11 transnational oil companies worldwide, which laid the foundation of the oil strategy proposed by national leader Heydar Aliyev, allowed Azerbaijan to play an important role in the Caucasus and Caspian Sea region, turning it into one of the international centers for the production of energy resources. After the signing of the “Contract of the Century”, the key issue was finding favorable ways for oil and gas transit. The choice of Georgia as a transit country would meet the interests of Azerbaijan. Starting from 1999, the first oil was transported via the Baku-Supsa pipeline, and from 2006 on the Baku-Tbilisi-Ceyhan main export oil pipeline. Transportation of gas, along with oil, is carried out through Georgia. Gas is transported to Georgia by the end of 2006 through the Baku-Tbilisi-Erzurum gas pipeline and from June 2007 to Turkey. The Southern Gas Corridor, which is probably the largest gas pipeline project put forward by Azerbaijan, involving Georgia, delivers the Shahdeniz Phase 2 gas from the Caspian Sea to Europe. The South Caucasus Pipeline Project Expansion, part of this project, encompasses the construction of new pipelines and associated facilities in both Azerbaijan and Georgia. The opening ceremony of the first phase of the Southern Gas Corridor project was held at Sangachal Terminal on May 29, 2018. Within the framework of the AGRI (Azerbaijan, Georgia, Romania Interconnector) project, which is one of the energy projects connecting Azerbaijan and Georgia, it is planned to transport natural gas through the pipeline to the Black Sea shores of Georgia, where it will be liquefied and transported by tankers to the terminal in Romania’s Constanta port and then to the gas infrastructure of Romania and other European countries in the form of natural gas. Georgia is not only a transit country for Azerbaijan, but also one of the largest consumers of hydrocarbon reserves. The State Oil Company of Azerbaijan Republic (SOCAR) has been operating in Georgia since 2006. SOCAR's activities in Georgia are carried out through “SOCAR Georgia Petroleum”, “SOCAR Gas Export-Import”, “SOCAR Georgia Gas”, “SOCAR Georgia Gas Distribution”, “Black Sea Terminal” and others.

scholarly journals COLLEMBALLS OF ECOSYSTEMS DOMINATED BY SAMSHIT KOLKHIDA IN THE SOCHINSKY BLACK SEA ZONE

2021 ◽  
Vol 6 (1(34)) ◽  
pp. 4-7
Author(s):  
Yuri Georgievich Shcherbina
Keyword(s):  
Black Sea ◽  
Quantitative Assessment ◽  
Olympic Games ◽  
The State ◽  
Forest Communities ◽  
Black Sea Region ◽  
Qualitative And Quantitative ◽  
The Olympic Games

According to the qualitative and quantitative assessment of springtails communities since 2007, the dynamics of the state of the Colchis boxwood ecosystems in the Sochi Black Sea region has been estimated. The conclusion about the dynamics of degradation of forest communities, unique for the coast, after the Olympic Games-2014 is substantiated.

Ovid and the Inscriptions

2019 ◽  
pp. 141-162
Author(s):  
Stephanie Ann Frampton
Keyword(s):  
Black Sea ◽  
Public Libraries ◽  
Written Language ◽  
The State ◽  
The Black Sea ◽  
The Public ◽  
The City

In the year 8 CE, Ovid was exiled to the Black Sea for “a song and a mistake.” This chapter explores a series of iconic poems from the Tristia in which Ovid imagines the state of exile through a variety of textual media: his own books of poetry sent back to the city and rejected from the public libraries; the lapidary inscriptions of Augustus he imagines them to encounter; and, several times over, his own funerary epitaph, formulated in explicit competition with Augustus’s own monumental list of deeds, the Res gestae. It is an examination of the challenges presented to the poet by exile and how he uses writing itself and written forms, real and imagined, to overcome that distance and disgrace, becoming increasingly aware that it was at the level of written language, and only at that level, that he and the emperor were “on the same page.”

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