DIATOM COMPLEXES IN THE BOTTOM SEDIMENTS OF BIG MIASSOVO LAKE (SOUTH URAL, RUSSIA)

2019 ◽  
Author(s):  
Elvira Zinnatova
Keyword(s):  
Bottom Sediments ◽  
Diatom Complexes

Diatoms in bottom sediments of thermokarst lakes of the Pechora Delta

2019 ◽  
pp. 285-290
Author(s):  
Elvira A. Zinnatova, Larisa A. Frolova ◽  
Larisa A. Frolova
Keyword(s):  
Bottom Sediments ◽  
Environmental Conditions ◽  
Sources Of Information ◽  
Thermokarst Lakes ◽  
Thermokarst Lake ◽  
Fouling Organisms ◽  
Diatom Complexes

The Northern lakes are good objects for paleoclimatic reconstructions. One of the sources of information about changes in the ecosystems of lakes are diatoms. The study of diatom complexes revealed 133 taxa belonging to 49 genera, 24 families, 13 orders and 3 classes in the bottom sediments of the thermokarst lake of the Pechora Delta. Dominated by the Holarctic representatives of benthic and fouling organisms giving preference to the alkaline environmental conditions.

Analysis of Rybinsk and Ivankovo reservoirs diatom complexes and phytoplankton associations long-term transformations

2019 ◽  
pp. 83-86
Author(s):  
Lev V. Razumovsky ◽  
Vikenty L. Razumovsky
Keyword(s):  
Bottom Sediments ◽  
Methodological Approach ◽  
Graphical Analysis ◽  
Comprehensive Analysis ◽  
Diatom Complexes

As a result of monitoring, a unified methodological approach was formulared for the ecosystems of the Ivankovsky and Rybinsk reservoirs, with comprehensive analysis of phytoplankton associations and diatom complexes from bottom sediments. In addition to traditional forms of hydrobiological analysis, the author's method of graphical analysis was applied.

Diatom complexes from bottom sediments of small lakes of the Imandra depression

2019 ◽  
pp. 220-224
Author(s):  
Anna L. Kosova ◽  
Dmitrii B. Denisov ◽  
Svetlana B. Nikolaeva
Keyword(s):  
Bottom Sediments ◽  
Sharp Increase ◽  
Tectonic Activity ◽  
Western Coast ◽  
Small Lakes ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
Murmansk Region ◽  
Diatom Complexes ◽  
Imandra Lake

The study of diatom complexes in the bottom sediments of 2 small nameless lakes on the western coast of Imandra Lake (Murmansk region) was carried out. The features of the historical dynamics of diatom flora in response to changes in the environment and climate in the Holocene are described. Diatom analysis revealed the effects of tectonic activity in the area of the Imandra Lake depression, accompanied by a sharp increase in the water level, which is confirmed by lithological data.

Comprehensive monitoring of the Klyazma reservoir

2020 ◽  
pp. 17-25
Author(s):  
Vikenty L. Razumovsky
Keyword(s):  
Chemical Composition ◽  
Bottom Sediments ◽  
Environmental Changes ◽  
Water Area ◽  
Graphical Analysis ◽  
Anthropogenic Factors ◽  
Layer By Layer ◽  
Reservoir Water ◽  
Chemical Composition Of Water ◽  
Diatom Complexes

The research was carried out during the comprehensive monitoring of the Klyazma reservoir in 2019. The work is devoted to the assessment of long-term environmental changes under the influence of natural and anthropogenic factors. The research combines two traditional methods of analysis. A layer-by-layer study of diatomic complexes and chemical composition in the bottom sediments of the reservoir was carried out. The results obtained were compared with the results of comprehensive monitoring on the taxonomic composition of phytoplankton and the chemical composition of water in the reservoir's water area. The results of previous studies on the chemical composition of water in the reservoir were used. In addition to the traditional forms of chemical and hydrobiological analysis, an innovative method of graphical analysis was applied to phytoplankton complexes and the principle of unification of bioindication methods was applied for diatom complexes from sediment columns. The main scenarios of taxonomic proportions transformations in phytoplankton and diatom complexes were determined using the method of graphical analysis for the Klyazma reservoir water area. The transformations are caused by the influence of water from the Moscow channel and the planned annual lowering of the water level in the reservoir. Bottom sediments showed a regular increase in the reservoirs level of saprobisation. Presumably, this is due to a non-linear increase in the number of tourists and an cahnges in recreational load. Pronounced accumulation of Cu, Zn and other heavy metals in the coastal zone of the reservoir was confirmed.

Paleoecological study of bottom sediments of the lake Goluboye (Karelian Isthmus) according to the results of diatom analysis

2019 ◽  
pp. 265-269
Author(s):  
Angelina E. Shatalova ◽  
Uriy A. Kublitsky ◽  
Dmitry A. Subetto ◽  
Anna V. Ludikova ◽  
Alar Rosentau ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Bottom Sediments ◽  
Modern Science ◽  
Karelian Isthmus ◽  
The Baltic Sea ◽  
Diatom Analysis ◽  
North West ◽  
The North ◽  
Important Direction ◽  
The Baltic

The study of paleogeography of lakes is an actual and important direction in modern science. As part of the study of lakes in the North-West of the Karelian Isthmus, this analysis will establish the dynamics of salinity of objects, which will allow to reconstruct changes in the level of the Baltic Sea in the Holocene.

HEAVY METAL SPECIATION IN BOTTOM SEDIMENTS OF THE VYSHNEVOLOTSKY RESERVOIR

2018 ◽  
pp. 46-54
Author(s):  
O. A. Lipatnikova
Keyword(s):  
Heavy Metal ◽  
Organic Matter ◽  
Bottom Sediments ◽  
Metal Speciation ◽  
Organic Matter Content ◽  
Water Reservoir ◽  
Matter Content ◽  
Heavy Metal Speciation ◽  
Mobile Forms ◽  
Manganese Hydroxides

The study of heavy metal speciation in bottom sediments of the Vyshnevolotsky water reservoir is presented in this paper. Sequential selective procedure was used to determine the heavy metal speciation in bottom sediments and thermodynamic calculation — to determine ones in interstitial water. It has been shown that Mn are mainly presented in exchangeable and carbonate forms; for Fe, Zn, Pb и Co the forms are related to iron and manganese hydroxides is played an important role; and Cu and Ni are mainly associated with organic matter. In interstitial waters the main forms of heavy metal speciation are free ions for Zn, Ni, Co and Cd, carbonate complexes for Pb, fulvate complexes for Cu. Effects of particle size and organic matter content in sediments on distribution of mobile and potentially mobile forms of toxic elements have been revealed.

Application of graphical analysis of taxonomical structure of diatom complexes in identification of critical conditions of the Neopleistocene lakes (on the example of Bibirevo section)

2019 ◽  
pp. 78-87
Author(s):  
Elena V. Bespalova
Keyword(s):  
Lake Sediments ◽  
Critical Points ◽  
Graphical Analysis ◽  
Volga Region ◽  
Critical Conditions ◽  
Ancient Lake ◽  
Diatom Complexes

Ancient lake sediments of Bibirevo section in the Yaroslavl and Kostroma Volga region are studied by means of graphical analysis of taxonomical structure of diatom complexes. This method allowed to record critical points (change of areas of stability) in the development of a Neopleistocene lake during the transition from stage to stage, as well as from phase to phase.

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