scholarly journals Cadmium content in aquatic organisms of the Caspian Sea

2022 ◽  
Vol 16 (4) ◽  
pp. 37-46
Author(s):  
T. S. Ershova ◽  
V. F. Zaitsev ◽  
V. A. Chaplygin ◽  
A. S. Khursanov
Keyword(s):  
Caspian Sea ◽  
Aquatic Organisms ◽  
Cadmium Content ◽  
The Caspian Sea

scholarly journals THE INFLUENCE OF OIL PRODUCTION ON AQUATIC ORGANISMS OF THE CASPIAN SEA

2019 ◽  
pp. 6-10
Author(s):  
Marina Vladimirovna KHLOPKOVA
Keyword(s):  
Invasive Species ◽  
Species Composition ◽  
Caspian Sea ◽  
Oil Pollution ◽  
Aquatic Organisms ◽  
Oil Production ◽  
Oil Products ◽  
Drilling Fluids ◽  
The Caspian Sea

The article summarizes data on the effects of oil products and drilling fluids on the inhabitants of the Caspian Sea., Compared to the Caspian autochthons, invasive species are more resistant to oil pollution. It leads to changes in the species composition of the biocenoses.

scholarly journals ACCUMULATION OF SELENIUM IN AQUATIC ORGANISMS OF THE CASPIAN SEA

2014 ◽  
pp. 77
Author(s):  
N. A. Golubkina ◽  
E. G. Spiridonova ◽  
V. F. Zaicev ◽  
I. V. Volkova ◽  
N. G. Nasibov
Keyword(s):  
Caspian Sea ◽  
Aquatic Organisms ◽  
The Caspian Sea

scholarly journals Relationship Between Trace Element Content in the Brain of Bony Fish Species and Their Food Items in the Southwest of the Caspian Sea Due to Anthropogenic Activities

2020 ◽  
Vol 7 (2) ◽  
pp. 78-85
Author(s):  
Masoud Sattari ◽  
Mohammad Forouhar Vajargah ◽  
Mehdi Bibak ◽  
Shima Bakhshalizadeh
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
Anthropogenic Activities ◽  
Perca Fluviatilis ◽  
Principal Component ◽  
Aquatic Organisms ◽  
Trace Element Content ◽  
Bony Fish ◽  
The Caspian Sea ◽  
The Brain

The trace elements (TEs) in aquatic environments due to anthropogenic activities are readily available to aquatic organisms. There are 153 fish species inhabiting the Caspian Sea. However, little is known about TE (TE) concentrations in these species. In this study, we investigated the effects of TEs levels in the brain of some bony fish species inhabiting the Caspian basin. Totally, 405 fish from nine species with different feeding behaviors including Leuciscus aspius (n = 20) and Perca fluviatilis (n = 37) as piscivores, Rutilus kutum (n = 27) and Rutilus caspius (n = 71) as carnivores, Vimba persa (n = 56), Ponticola caspia (n = 25) and Tinca tinca (n = 31) as mollusivores, and Alburnus chalcoides (n = 77) and Alosa braschnikowi (n = 61) as zooplanktivores were collected from the southwest of the Caspian Sea basin from September 2017 to June 2018. The ICP-OES was used to measure TEs in the brain tissue of fish. The variability of TEs concentrations in the brain tissues of these fishes by principal component analysis (PCA) was decreased to 63.59% and 17.68% for PC1 and PC2, respectively, exhibiting that 81.27% of the total variability is associated with K, Mg, P, S, Zn, and Al. The two-dimensional diagrams showed the weight of each component in PCA. The PC1 was mostly influenced by P, Mg, K, and Zn, while the greatest value in PC2 belonged to Al. Furthermore, the entire number of elements determined in this study was found to be a suitable indicator for the distinction between fish species based on their feeding items.

scholarly journals RETROSPECTIVE ANALYSIS OF RESTRUCTURING IN COMPOSITION OF MACROZOOBENTHOS UNDER CASPIAN SEA TRANSGRESSION

2021 ◽  
Vol 2021 (2) ◽  
pp. 47-54
Author(s):  
Anna Viktorovna Mikhajlova
Keyword(s):  
Sea Level ◽  
Caspian Sea ◽  
Oxygen Deficiency ◽  
Aquatic Organisms ◽  
High Water ◽  
Bottom Fauna ◽  
Species Structure ◽  
The Caspian Sea ◽  
Retrospective Nature ◽  
Quantitative Changes

The article highlights the processes of lowering and raising the Caspian Sea level and its influence on the quantitative and qualitative characteristics of the aquatic bioresources, including zoobenthos. The development of macrozoobenthos in the Caspian Sea including the Northern Caspian is associated with various processes: chemical, physical and biological. The presence of macrozoobenthos determines the fish productivity in the sea, it is an integral part of the ecosystem of the northern part of the Caspian Sea. In this regard, the assessment of the composition and quantitative characteristics of bottom communities becomes important. One of the urgent tasks of modern hydrobiology is detecting the basic regularities in the biotic processes that affect the qualitative and quantitative changes in the aquatic organisms. This research is of a retrospective nature. On the basis of a long-term analysis of the dynamics of the species structure of bottom zoocenoses there have been revealed the changes in the macrozoobenthos of the western part of the Northern Caspian in the first and second periods of the sea level rise (1978–1988 and 1989–1995). Decreasing water salinity, increasing desalinated zones and areas with oxygen deficiency in the bottom horizon (in the extremely high-water years of 1990 and 1991) contributed to the significant changes in the quantitative and qualitative composition of the bottom fauna. From the first stage to the second there was recorded a decrease in the number and biomass of crustaceans and molluscs. The species Stenogammarus macrurus (G. O. Sars) and Stenogammarus similis (G. O. Sars), which are tolerant to the significant salinity fluctuations, as well as abra, which is resistant to oxygen deficiency were most abundant in the water complex with light salinity. Also, there has been considered the water content of the rivers of the Caspian basin and the type of soil as factors influencing changes in the concentration of macrozoobenthos.

scholarly journals Transference of metals in the soil‐food chain system:   of Caspian Sea sturgeons

2019 ◽  
Vol 14 (3) ◽  
pp. 138-143
Author(s):  
V. A. Chaplygin ◽  
T. S. Ershova ◽  
V. F. Zaitsev
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption ◽  
Food Chain ◽  
Benthic Invertebrates ◽  
Caspian Sea ◽  
Aquatic Organisms ◽  
Trophic Chain ◽  
The Caspian Sea ◽  
Biochemical Processes ◽  
The North

Aim. Identification of metal transference characteristics in components of the ecosystem of the north‐western part of the Caspian Sea.   Material and Methods. Sampling was carried out according to generally accepted  methods and the determination of heavy metals was carried out by atomic absorption spectroscopy using an atomic absorption spectrometer with electro‐thermal  atomization MGA‐915 MD.   Results. In studying the migration of trace elements in the trophic chains of the  Caspian Sea sturgeon species it was found that: (a) chromium, manganese and iron  do not accumulate along the trophic chain researched; (b) accumulation of lead and  cobalt above the trophic level occupied by benthic invertebrates did not occur; (c)  cadmium, nickel and copper were accumulated primarily by benthic organisms,  while cadmium and nickel accumulated in the kidneys of Russian and Persian sturgeons and copper accumulated in the liver of both species (d) bioaccumulation of  zinc occurs sequentially in the links: soil‐water‐benthic invertebrates‐benthophage  fish (in Russian and Persian sturgeons in their kidneys, liver and muscles) and (e)  mercury migrates along the links of the food chain, accumulation coefficients increasing progressively in the system: soil‐Didacna mollusc‐benthophage fish (in  Russian and Persian sturgeons in their kidneys, liver and muscles).   Conclusion. The accumulation of heavy metals from water amongst aquatic organisms depends on the properties of the metal, its involvement in biochemical processes, species, biological status and the nature of abiotic living conditions. 

THE NUMBER AND QUALITATIVE CHARACTERISTICS OF FRY FISH IN SHALLOW COASTAL WATERS OF THE VOLGA IN THE SUMMER-AUTUMN PERIOD OF 2012

2017 ◽  
pp. 65-73
Author(s):  
Edward Vladimirovich Nikitin
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Volga River ◽  
Commercial Fish ◽  
Autumn Period ◽  
Fish Juveniles ◽  
Qualitative Characteristics ◽  
Shallow Coastal Waters

Shallow coastal waters of the Volga river is a flooded feeding area for fish juveniles of nonmigratory fish species. There takes place annual downstream migration of fluvial anadromous fish species from spawning grounds of the Volga river to the Northern Caspian Sea. The most important factors determining the number and qualitative characteristics of fry fishes are the level of the Caspian Sea (currently having a tendency to the lowering), hydrological and thermal regimes of the Volga river. Researches were carried out in definite periods of time. In the summer-autumn period of 2012 fry fishes were presented by 19 species (13 of them were commercial species), which belonged to 9 families. The article gives data on all the commercial fish species. In the first decade of July the maximum number of fry fish was registered in the western part of the Volga outfall offshore - in box 247 (19.86 mln specimens/km2), in the eastern part - in box 142 (20.4 mln specimens/km2). The most populous were roach, red-eye, silver bream and bream; size-weight characteristics were better in the areas remoted from the Volga delta. In the third decade of July the quantitative indicators of fry fish on these areas decreased, size-weight characteristics greatly increased. In the second decade of October in the western part of the seaside there were registered increased pre-wintering concentrations of fish juveniles, their qualitative indicators increased, which is evidence to favorable feeding conditions in 2012.

On the type locality of the steppe ribbon racer, Psammophis lineolatus (Brandt, 1838) (Serpentes: Lamprophiidae)

2020 ◽  
Vol 324 (2) ◽  
pp. 262-272
Author(s):  
I.V. Doronin ◽  
T.N. Dujsebayeva ◽  
K.M. Akhmedenov ◽  
A.G. Bakiev ◽  
K.N. Plakhov
Keyword(s):  
Caspian Sea ◽  
Type Specimen ◽  
Type Locality ◽  
Eastern Coast ◽  
Zoological Museum ◽  
Western Coast ◽  
The Caspian Sea ◽  
Original Species ◽  
Academy Of Sciences ◽  
Made In

The article specifies the type locality of the Steppe Ribbon Racer. The holotype Coluber (Taphrometopon) lineolatus Brandt, 1838 is stored in the reptile collection of the Zoological Institute of the Russian Academy of Sciences (ZISP No 2042). Literature sources provide different information about the type locality. A mistake has been made in the title of the work with the original species description: the western coast of the sea was indicated instead of the eastern one. The place of capture was indicated as “M. Caspium” (Caspian Sea) on the label and in the reptile inventory book of the Zoological Museum of the Academy of Sciences. The specimen was sent to the museum by G.S. Karelin. The “1842” indicated on the labels and in the inventory book cannot be the year of capture of the type specimen, just as the “1837” indicated by A.M. Nikolsky. In 1837, Karelin was in Saint Petersburg and in 1842 in Siberia. Most likely, 1837 is the year when the collection arrived at the Museum, and 1842 is the year when the information about the specimen was recorded in the inventory book (catalog) of the Zoological Museum of the Academy of Sciences. In our opinion, the holotype was caught in 1932. From Karelin’s travel notes of the expedition to the Caspian Sea in 1832, follows that the snake was recorded in two regions adjacent to the eastern coast of the Caspian Sea – Ungoza Mountain (“Mangyshlak Mountains”) and site of the Western Chink of Ustyurt between Zhamanairakty and Kyzyltas Mountains (inclusive) on the northeast coast of Kaydak Sor (“Misty Mountains”). In our article, Karelin’s route to the northeastern coast of the Caspian Sea in 1832 and photographs of these localities are given. The type locality of Psammophis lineolatus (Brandt, 1838) should be restricted to the Mangystau Region of the Kazakhstan: Ungoza Mountain south of Sarytash Gulf, Mangystau (Mangyshlak) Penninsula (44°26´ N, 51°12´ E).

ICE CONDITIONS IN THE NORTH-WESTERN PART OF THE CASPIAN SEA IN THE MODERN PERIOD

2020 ◽  
Vol 19 (6) ◽  
pp. 4-17
Author(s):  
Nepomenko Leonid ◽  
◽  
Popova Natalia ◽  
Zubanov Stepan ◽  
Ostrovskaya Elena ◽  
...  
Keyword(s):  
Caspian Sea ◽  
The Caspian Sea ◽  
The North ◽  
Modern Period ◽  
Ice Conditions ◽  
North Western
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