scholarly journals THE DISTRIBUTION OF DISSOLVED FORMS OF IRON AND MANGANESE IN THE WATER COLUMN OF THE CASPIAN SEA

2016 ◽  
Author(s):  
С.И. Фелицин ◽  
В.В. Ковалев
Keyword(s):  
Spatial Distribution ◽  
Water Column ◽  
Water Samples ◽  
Caspian Sea ◽  
Chemical Analyses ◽  
Common Elements ◽  
The Caspian Sea ◽  
Southern Caspian Sea ◽  
Iron And Manganese ◽  
Forms Of Iron

По результатам химических анализов 518 проб воды Северного, Среднего Каспия и, частично, Южного Каспия определено содержание растворенных форм наиболее распространенных элементов – железа и марганца. Приведены карты пространственного распределения этих элементов в поверхностном и наддонном водных горизонтах, а также по вертикальным разрезам водной толщи. Для каждого из изученных элементов выявлены факторы, определяющие его концентрацию и закономерности распространения в морской воде. Based on the results of chemical analyses of water samples 518 North Caspian, middle and southern Caspian Sea, partially, the contents of soluble forms of the most common elements of iron and manganese. Provides maps of the spatial distribution of these elements in the surface and aquifers, as well as on vertical sections of the water column. For each of the studied elements identified factors that determine its concentration and patterns of distribution in seawater. 

scholarly journals THE DISTRIBUTION OF DISSOLVED FORMS COPPER IN THE WATER COLUMN OF THE CASPIAN SEA

2018 ◽  
Author(s):  
В.В. Ковалев ◽  
С.Г. Парада
Keyword(s):  
Surface Layer ◽  
Spatial Distribution ◽  
Water Column ◽  
Caspian Sea ◽  
Sea Water ◽  
Average Content ◽  
Vital Activity ◽  
The Caspian Sea ◽  
Organic Complexes ◽  
High Concentrations

По результатам химических анализов проб воды Северного, Среднего Каспия и, частично, Южного Каспия, отобранных по профилям из различных горизонтов водной толщи, определены содержания растворенных форм меди. Построены карты пространственного распределения этого элемента в поверхностном и наддонном водных горизонтах, а также по вертикальным разрезам водной толщи, выявлены закономерности их распространения в объеме морской воды. Установлены средние содержания растворенных форм меди в поверхностном (8,6 мкг/л) и в наддонном (9,6 мкг/л) горизонтах  Каспийского моря. Выделены участки с аномально высокими (более 20 мкг/л) и аномально низкими (менее 5 мкг/л) концентрациями растворенных форм меди в них. Особенности распределения растворенных форм меди по вертикали водной толщи определяются жизнедеятельностью планктонных организмов и их отмиранием. В поверхностном слое аномально высокие концентрации меди связаны с прижизненным накоплением металла планктоном. На глубинах свыше 100 м аномально высокие ее концентрации связаны с распадом отмерших организмов и выделением меди и других металлов в виде органических комплексов According to the results of chemical analyzes of water samples from the Northern, Middle Caspian and, partially, the Southern Caspian, taken from profiles from different horizons of the water column, the contents of dissolved forms of copper were determined. Maps of the spatial distribution of this element in the surface and supra-aquatic horizons, as well as along vertical sections of the water column, have been constructed, and patterns of their distribution in the volume of sea water have been revealed. The average content of dissolved forms of copper in the surface (8.6 μg/l) and in the above bottom (9.6 μg/l) horizons of the Caspian Sea has been established. Selected areas with abnormally high (more than 20 μg/l) and abnormally low (less than 5 μg/l) concentrations of dissolved forms of copper in them. The specific features of the distribution of dissolved forms of copper along the vertical of the water column are determined by the vital activity of planktonic organisms and their death. In the surface layer, abnormally high concentrations of copper are associated with the lifetime accumulation of metal by plankton. At depths above 100 m, its abnormally high concentrations are associated with the decay of dead organisms and the release of copper and other metals in the form of organic complexes

X. Growing Tension and the Threat of War in the Southern Caspian Sea: The Unsettled Division Dispute and Regional Rivalry

2003 ◽  
Vol 2 (3) ◽  
pp. 575-591
Author(s):  
Hooman Peimani
Keyword(s):  
Caspian Sea ◽  
The United States ◽  
Caspian Region ◽  
Legal Regime ◽  
The Caspian Sea ◽  
Military Conflict ◽  
American Military ◽  
Military Presence ◽  
Military Conflicts ◽  
Southern Caspian Sea

AbstractThe absence of an acceptable legal regime for the division of the Caspian Sea among its five littoral states has created grounds for conflicts, crises, and wars in the Caspian region, a situation worsened since 2001 when Iran, Azerbaijan, and Turkmenistan found each other on a collision course over the ownership of certain offshore oilfields. The region has since been heading towards militarization, while the persistence of conflicts over the Caspian Sea's division has prepared the ground for military conflicts. Fear of lagging behind in an arms and the manipulation of conflicts by the United States and Turkey have further encouraged militarization. Against this background, certain factors, including Turkey's efforts to deny Iran political and economic gains in the Caspian region, the growing American military presence in Eurasia, and the expanding American-Azeri military ties since 11 September 2001 will likely contribute to the creation of a suitable ground for a military conflict in the Caspian region.

Paracobitis abrishamchiani, a new crested loach from the southern Caspian Sea basin (Teleostei: Nemacheilidae)

Zootaxa ◽  
2019 ◽  
Vol 4545 (3) ◽  
pp. 375 ◽  
Author(s):  
HAMED MOUSAVI-SABET ◽  
SABER VATANDOUST ◽  
MATTHIAS F. GEIGER ◽  
JÖRG FREYHOF
Keyword(s):  
New Species ◽  
Middle East ◽  
Caspian Sea ◽  
Colour Pattern ◽  
Nucleotide Substitutions ◽  
The Caspian Sea ◽  
Dorsal Fin ◽  
Mtdna Coi ◽  
River Drainages ◽  
Southern Caspian Sea

Paracobitis abrishamchiani, new species, is described from the southern Caspian Sea basin, where it is found in the Babol, Haraz, Siah, Tajan, Talar and Kashpal River drainages. It is distinguished from P. hircanica and P. atrakensis, the two other Paracobitis species known from the Caspian Sea basin, by having scales on the flank posterior to the dorsal-fin origin and from its congeners in the Middle East by the position of its dorsal-fin origin, having a roundish posterior narial opening, and a colour pattern consisting of many widely spaced brown spots and blotches. It is further characterized by six diagnostic nucleotide substitutions and a minimum K2P distance of 4.3% to P. persa and 4.6% to P. malapterura in the mtDNA COI barcode region. 

scholarly journals Genotyping of Acanthamoeba spp. Isolated from the Caspian Sea in Iran

2020 ◽  
Vol 2 (1) ◽  
pp. 9
Author(s):  
Mahmoudi M.R. ◽  
Karanis P.
Keyword(s):  
Water Samples ◽  
Caspian Sea ◽  
Nucleotide Sequencing ◽  
Chain Reaction ◽  
The Caspian Sea ◽  
Free Living ◽  
Public Health Professionals ◽  
Causative Agents ◽  
Polymerase Chain ◽  
Seawater Samples

Acanthamoeba spp. are widely distributed in the environment and have been reported to be causative agents of lethal encephalitis and keratitis. In this study, thirty water samples from the Caspian Sea were collected during 2018. Water samples were filtrated and the filtrate used for culture. The positive samples were subjected to Polymerase Chain Reaction (PCR) and nucleotide sequencing. Free-living amoebae were identified in 50% (15/30) of the seawater samples. DNA sequencing revealed the presence of T2 and T4 genotypes. The results of the present study confirmed the presence of potentially pathogenic strains in seawater in this area. This awareness should be raised among environmental and public health professionals.

DETERMINATION OF HEAVY METALS IN WATER SAMPLES TAKEN FROM THE SHIKH AREA OF THE CASPIAN SEA USING ICP-MS (7500CX) DEVICE

Alchemist ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 19-24
Author(s):  
S.R. Hajiyeva ◽  
◽  
T.I. Aliyeva ◽  
N.M. Cafarova
Keyword(s):  
Heavy Metals ◽  
Environmental Monitoring ◽  
Water Samples ◽  
Caspian Sea ◽  
Research Laboratory ◽  
Marine Water ◽  
The Caspian Sea ◽  
Icp Ms ◽  
Analytical Research

Water samples were taken from the Shikh shore of the Caspian Sea to conduct the research. In the marine water samples taken from the area, heavy metals were identified using the Agilent 7500 Series ICP-MS device. The analyzes were performed in the Complex Analytical Research Laboratory of the National Department of Environmental Monitoring

Environmental impacts of physical and dynamical characteristics of the southern coastal waters of the Caspian Sea

2021 ◽  
pp. 1-14
Author(s):  
Siamak JAMSHIDI ◽  
Mahdieh JAFARI
Keyword(s):  
Water Column ◽  
Caspian Sea ◽  
General Circulation ◽  
Middle Part ◽  
Marine Debris ◽  
The Caspian Sea ◽  
Seasonal Thermocline ◽  
Field Samples ◽  
Current Characteristics ◽  
Coastal Flow

ABSTRACT This research evaluated the variability of current characteristics and seawater properties in the middle part of the southern shelf of the Caspian Sea. The effect of the coastal flow on marine debris dispreading was assessed in the southern Caspian Sea for the first time. The findings showed the existence of thermal stratification containing seasonal thermocline with thickness of about 40 m in the water column. Maximum monthly along-shore current velocities around 1.3 m s−1 were observed in November and December. Monthly variations were clearly found in both flow velocity and local wind components. However, no significant levels of correlation between wind and current speeds were observed during the study in the region. In some cases, the mean monthly cross-shore component velocities were measured at about 29 cm s−1 in November. The findings indicated that there was no upwelling phenomenon associated to the regional wind in the study area. In situ current measurements indicated dominant east and north-northeast directions, presumably related to the effect of general circulation in the southern basin. Current profiles in the water column displayed similarity in directions at 10, 15 and 20 m depths over the continental shelf. The field samples and analysis revealed that the soft and smaller-scale seawater litters can be carried long distances by the current along the coast. Most coastal based and marine litters originated from the tourist activities (in the middle and western parts of the shores) and waste emanated from the river (Tonekabon-Nowshahr).

scholarly journals The first evidence for Late Pleistocene hominin populations on the southern Caspian Sea coast

Antiquity ◽  
2017 ◽  
Vol 91 (355) ◽  
Author(s):  
Hamed Vahdati Nasab ◽  
Kourosh Roustaei ◽  
Mohammad Ghamari Fatideh ◽  
Fatemeh Shojaeefar ◽  
Milad Hashemi Sarvandi
Keyword(s):  
Water Resources ◽  
Late Pleistocene ◽  
Caspian Sea ◽  
Climatic Conditions ◽  
Human Settlement ◽  
The Caspian Sea ◽  
The North ◽  
Dispersal Corridors ◽  
Sea Coast ◽  
Southern Caspian Sea

The southern shore of the Caspian Sea is well known for its great potential in relation to sites of Mesolithic date (e.g. Coon 1951; Jayez & Vahdati Nasab 2016). Situated between two major geographic barriers—the Alborz Mountains to the south, and the Caspian Sea to the north—this area has been considered one of the major hominin dispersal corridors during the Pleistocene–Holocene transition (Vahdati Nasab et al. 2013). Furthermore, the relatively stable and mild climatic conditions, vast and lush temperate forests, and abundance of fauna and water resources have all made this region an attractive niche for human settlement.

scholarly journals Length-weight relationship and condition factor of three endemic fish species, Ponticola bathybius, Neogobius caspius and N. pallasi (Perciformes: Gobiidae) from the Southern Caspian Sea basin, Iran

2021 ◽  
Vol 38 (4) ◽  
pp. 523-525
Author(s):  
Nasrin Nikmehr ◽  
Soheil Eagderi ◽  
Hadi Poorbagher ◽  
Keyvan Abbasi
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
Condition Factor ◽  
Biological Information ◽  
Biological Research ◽  
The Caspian Sea ◽  
Baseline Information ◽  
Endemic Fish ◽  
First Time ◽  
Southern Caspian Sea

In this study, the length-weight relationships (LWRs) and condition factors were estimated for 445 specimens belonging to three gobiid species viz. Ponticola bathybius (Kessler, 1877), Neogobius caspius (Eichwald, 1831) and Neogobius pallasi (Berg, 1916) from the Southern Caspian Sea basin. Total length and total weight of the examined specimens ranged 4.9-28.3 cm and 0.64-263.4 g, respectively. The length-weight parameter b of the studied species found between 2.47 (N. caspius) and 3.45 (N. pallasi) with r2 ranging 0.831 to 0.988. LWR and K parameters are reported first time for N. pallasi from the Caspian Sea basin. The condition factor estimated was calculated from 0.94 (N. pallasi) to 0.98 (N. caspius) and 1.00 (P. bathybius). The basic biological information on the LWRs of these three gobies will be useful as baseline information for further biological research in the region.

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