scholarly journals Seasonal changes of free-living ciliate communities in different biotopes of the Agzibir Lake

2020 ◽  
Keyword(s):  
Species Diversity ◽  
Caspian Sea ◽  
Subsequent Development ◽  
Silty Sand ◽  
Animal Origin ◽  
Biogenic Elements ◽  
Plant Residues ◽  
The Caspian Sea ◽  
Free Living ◽  
Bird Colonies

The Agzibir Lake is optimal in terms of hydrochemical and hydrobiological factors for formation of higher biodiversity of free-living ciliates. This is facilitated with continuous entering biogenic elements as a result of metabolism of large bird colonies and decaying organic residues of plant and animal origin. The Agzybir Lake having a link with the Caspian Sea in spring and fall is a place of spawning and the subsequent development of larvae of many commercially valuable fishes of the Caspian Sea, for which ciliates are a valuable starting food source in early stages of ontogenesis. During 2014–2019, totally 169 species of free-living ciliates were found by us, and 34 of them were observed for the first time for the Caspian fauna. The minimum species diversity was observed in plankton, where 46 species were recorded. In benthos of the sandy biotope, 58 species were found, whereas in the silty sand one, 80 species. At the silt soil in the biotope of gray silt, we found 72 species, the maximum species diversity (84 species) was observed in the silt biotope with plant residues, while at the black silt with sapropel communities 66 species of free-living ciliates were found. In the periphyton biotope, we observed 71 species, while in coastal thickets of algae (phytociliocenosis) 79 species of free-living ciliates were found. As with the sandy biotope, the black silt biotope, sometimes with small communities of sapropel silt, is much smaller in area than the rest of benthic biotopes of the Agzibir Lake. Yet, free-living ciliate communities of black silt are specific and include several species that are tolerant to low oxygen and hydrogen sulfide in water. The seasonal variations of total quantity of free-living ciliates of benthic biotopes have three maxima (in spring, summer and autumn). As for the rest of biotopes of plankton, periphyton and phytociliocenosis, only two maxima (in spring and autumn) were revealed. The greatest similarity of species diversity was observed within benthic communities. But lowest similarity was observed between sapropel silt and the rest. As was already mentioned, this is due to specific ecological conditions of sapropel silt biotope.

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.

scholarly journals Free-living ciliates in different coastal zone biotopes at the Azerbaijan sector of the Caspian Sea

Protistology ◽  
2019 ◽  
Vol 12 (3) ◽  
Author(s):  
Ilham Kh. Alekperov ◽  
◽  
Elyana N. Tahirova ◽  
Keyword(s):  
Coastal Zone ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Free Living

scholarly journals Isolation and identification of free-living amoeba from the hot springs and beaches of the Caspian Sea

2020 ◽  
Vol 10 ◽  
pp. e00151
Author(s):  
Alireza Latifi ◽  
Mahboobeh Salami ◽  
Elham Kazemirad ◽  
Mohammad Soleimani
Keyword(s):  
Caspian Sea ◽  
Hot Springs ◽  
The Caspian Sea ◽  
Isolation And Identification ◽  
Free Living ◽  
Free Living Amoeba

scholarly journals Contemporary ecological state of waters of the Caspian Sea during development of oil and gas deposits

2021 ◽  
Vol 16 (2) ◽  
pp. 98-107
Author(s):  
A. F. Sokolskiy ◽  
A. Sh. Kanbetov ◽  
N. N. Popov ◽  
B. A. Mutashev ◽  
N. I. Rabazanov
Keyword(s):  
Caspian Sea ◽  
Oil And Gas ◽  
Sea Water ◽  
Petroleum Products ◽  
Water Area ◽  
Gas Production ◽  
Biogenic Elements ◽  
The Caspian Sea ◽  
Marine Research ◽  
The Impact

Aim. This study was an attempt by the authors to identify the impact of oil production in the Caspian Sea on the quality of waters surrounding oil and gas-production platforms.Material and Methods. In 2018, by order of the Committee for Forestry and Wildlife of the Ministry of Agriculture of the Republic of Kazakhstan, Kazekoproekt carried out comprehensive marine research to assess the state of biological resources in the eastern part of the Caspian Sea. All studies were carried out according to standard methods accepted in international practice. Samples were collected in summer (July-August) 2018 and autumn (September) 2018.Results. An analysis of the materials of environmental studies carried out in the water area of the eastern part of the Caspian Sea in 2018 established the absence of biogenic concentrations in sea water in excess of the standard indicators. It was found that in the waters surrounding several stations in summer and autumn, concentrations of oil products were exceeded. The concentrations of pesticides in the waters of the northern Caspian Sea recorded in 2018 were not detected.Conclusion. It was found that in the eastern part of the Caspian Sea in 2018 there was no concentration of biogenic elements in sea water above the standard indicators. Of the heavy metals, an excess of maximum permissible concentrations was found only at one station - of copper in the summer over 159 sq. m and in the autumn over 121 sq. m. Of particular concern is the fact that at several stations in summer and autumn excessive concentrations of petroleum products were recorded. The concentrations of pesticides in the waters of the northern Caspian Sea recorded in 2018 were not detected.

scholarly journals Detection of potentially pathogenic free-living amoebae from the Caspian Sea and hospital ward dust of teaching hospitals in Guilan, Iran

2021 ◽  
Vol 19 (2) ◽  
pp. 278-287
Author(s):  
Mohammad Reza Mahmoudi ◽  
Nozhat Zebardast ◽  
Frederick R. Masangkay ◽  
Panagiotis Karanis
Keyword(s):  
Caspian Sea ◽  
Hospital Staff ◽  
Human Infection ◽  
Hospital Ward ◽  
Teaching Hospitals ◽  
The Caspian Sea ◽  
Free Living ◽  
Diagnostic Strategies ◽  
Sanitation And Hygiene ◽  
Seawater Samples

Abstract Free-living amoebae (FLA) thrive in diverse environmental conditions. The present study aimed to define the FLA distribution from the Caspian Sea as well as from hospital ward dust from Guilan, Iran. Seawater (20) and hospital ward dust samples (100) were collected from May to June 2018. Seawater samples were vacuum filtered through a 0.45 μm pore-size membrane. Dust was collected using sterile gauze, washed with sterile distilled water, with washings collected thereafter. Washings were similarly filtered as seawater samples. FLA from the filtered material was cultivated in non-nutrient agar. Molecular analysis was performed by PCR and sequencing using specific primers for Acanthamoeba, Naegleria, and Vermamoeba/Hartmanella. Culture and PCR returned 50 and 65% positivity, respectively, for seawater samples where sequencing revealed Acanthamoeba T2, T5 and T6 genotypes and A. palestinensis and A. lenticulata, as well as N. dobsoni and N. clarki. In addition, 30% amoebic growth and 16% PCR detection were observed from hospital ward dust samples where sequencing revealed Acanthamoeba T2, T4 and T11 genotypes and A. castellanii, A. palestinensis and A. stevensoni as well as N. clarki. For both seawater and dust samples, Acanthamoeba was the dominant isolate. The detection of potentially pathogenic FLA from seawater may pose a threat to the public, while the presence of the same in dust spells threats to both hospital staff and patients, in particular, immunocompromised individuals. Public education, awareness, improved sanitation and hygiene, and the crafting of diagnostic strategies for the early detection of FLA in humans are necessary for the mitigation and management of potential human infection cases.

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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