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.

scholarly journals Таксономическое разнообразие диатомовых комплексов голоценовых донных отложений малых водоемов депрессии озера Имандра

2020 ◽  
Vol 12 (1) ◽  
pp. 41
Author(s):  
А.Л. Косова ◽  
Д.Б. Денисов ◽  
С.Б. Николаева
Keyword(s):  
Environmental Changes ◽  
Taxonomic Diversity ◽  
Western Coast ◽  
Diatom Algae ◽  
Tectonic Event ◽  
Algal Communities ◽  
The Holocene ◽  
Small Water ◽  
Murmansk Region ◽  
Diatom Complexes

A study of the taxonomic diversity of diatom algae in Holocene bottom sediments of two small water basins at the western coast of the lake Babinaskaya Imandra (Murmansk Region) has demonstrated the historical transformations of the species compositions of structures of diatom complexes associated with environmental changes in the Holocene. The water basins studied featured the predominance of the benthic and adhesive algae in the algal communities throughout the Holocene. The most drastic changes in the diatom complexes were associated with a tectonic event nearby the Imandra depression.

Diatomic flora of Lake Tikozero in the Holocene

2020 ◽  
pp. 24-31
Author(s):  
Anna L. Kosova ◽  
Dmitrii B. Denisov
Keyword(s):  
Preliminary Data ◽  
Taxonomic Composition ◽  
Eastern Coast ◽  
Benthic Species ◽  
Diatom Analysis ◽  
Composition And Structure ◽  
Murmansk Region ◽  
Littoral Species ◽  
Diatom Complexes ◽  
Alkaline Waters

Preliminary data of micropaleontological (diatom) study of sediments of Lake Tikozero located on the eastern coast of Lake Yokostrovskaya Imandra (Murmansk region) are presented. Based on the results of diatom analysis, the taxonomic composition and structure of diatom complexes were studied, the stages of the development of the ecosystem of the lake were established. The studied lake was characterized by the dominance of benthic forms and fouling in the composition of paleosocial communities. Upward in the column of sediments, there is a change in indicator groups with respect to pH: the proportion of acidophils decreases from 62% to 18%, and the proportion of alkaliphiles increases from 5% to 40%. A change in the dominant diatom complex was revealed: the acidophilic benthic species Brachysira zellensis (Grunow) Round & D.G. Mann is replaced by the littoral species Staurosira construens Ehrenberg, which prefers slightly alkaline waters.

Biostratigraphy of the Holocene deposits of the Azov Sea based on the results of diatom analysis

2019 ◽  
pp. 215-219 ◽  
Author(s):  
Galina V. Kovaleva
Keyword(s):  
Bottom Sediments ◽  
Dominant Species ◽  
Diatom Analysis ◽  
Open Part ◽  
Diatom Flora ◽  
The Holocene ◽  
Azov Sea ◽  
The Difference ◽  
Taganrog Bay ◽  
Massive Development

The difference in composition of diatom flora dominant species of the Taganrog Bay with the flora that existed in the New Azov and Ancient Azov time at open part of the Azov Sea was described. It is noted that dominant at the Sea representatives of the genus Actinocyclus Ehr. are rare in the bottom sediments of the Taganrog Bay, unlike Thalassiosira incerta Makarova and T. decipiens (Grunow) E.G. Jørg., that got a massive development in there.

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.

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.

Modeling of ecological conditions in the Euxine Basin in the Sarmatian and Maeotian by methods of diatom analysis

2019 ◽  
pp. 257-261
Author(s):  
Eleonora P. Radionova
Keyword(s):  
Black Sea ◽  
Late Miocene ◽  
The Black Sea ◽  
Subtidal Zone ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
North West ◽  
Ecological Conditions ◽  
The North

The associations and ecological conditions of the existence of modern diatoms of the North-West (Pridneprovsky), Prikerchensky and Eastern regions of the subtidal zone of the Black Sea are considered. Based on the unity of the composition of the Present and Sarmatian-Meotian diatom flora, an attempt has been made to model some of the ecological c situation of the Late Miocene Euxinian basin.

Holocene diatom assemblages from Dunderbukhta sediments, West Svalbard

2019 ◽  
pp. 242-245
Author(s):  
Ksenya V. Poleshchuk ◽  
Zinaida V. Pushina ◽  
Sergey R. Verkulich
Keyword(s):  
Environmental Changes ◽  
Ecological Groups ◽  
Diatom Assemblages ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
Sediment Samples ◽  
Ecological Zones ◽  
Middle Holocene ◽  
Temperature Trends

The diatom analysis results of sediment samples from Dunderbukta area (Wedel Jarlsberg Land, West Svalbard) are presented in this paper. The diatom flora consists of four ecological groups, which ratio indicates three ecological zones. These zones show environmental changes of the area in early–middle Holocene that is demonstrating periods of regression and temperature trends.

Flora of diatoms of the surface layer of bottom sediments of small lakes of the southeastern part of Belarus

2004 ◽  
Vol 6 (2) ◽  
pp. 186-198
Author(s):  
G. K. Khursevich ◽  
A. V. Kudelskiy ◽  
S. A. Fedenya ◽  
J. Marphy
Keyword(s):  
Surface Layer ◽  
Bottom Sediments ◽  
Small Lakes ◽  
Southeastern Part

Sedimentation of Pb-210 in Laurentian Shield Lakes

1984 ◽  
Vol 19 (2) ◽  
pp. 97-109 ◽  
Author(s):  
R.J. Cornett ◽  
L. Chant ◽  
D. Link
Keyword(s):  
Lake Sediments ◽  
Water Column ◽  
Rate Constant ◽  
Bottom Sediments ◽  
Atmospheric Fallout ◽  
Small Lakes ◽  
Fractional Rate ◽  
Total Input ◽  
Shield Lakes ◽  
Annual Flux

Abstract The average annual flux of Pb-210 from the atmosphere to lake surfaces and to the bottom sediments was measured in seven small lakes located on the Laurentian Shield. Direct atmospheric fallout of Pb-210 was 136 ± 16 Bq m-2 a-1 Streams from the lakes' catchments input an additional 5 to 473 Bq m-2 a-1. Only 16 to 80 percent of the total input was found in the lake sediments. The fractional rate constant for Pb-210 sedimentation from the water column ranged from 0.25 to 5.3 per annum.

scholarly journals Organochlorine compounds in subarctic small lakes

2020 ◽  
Vol 66 (2) ◽  
pp. 180-197
Author(s):  
E. S. Kolpakova ◽  
A. V. Velyamidova
Keyword(s):  
Lake Sediments ◽  
Bottom Sediments ◽  
Hydrothermal System ◽  
Atmospheric Transport ◽  
Electron Capture Detection ◽  
Adjacent Area ◽  
Chlorinated Phenols ◽  
Natural Boundary ◽  
Small Lakes ◽  
Lake Ecosystems

The article presents the results of studies of the environmental properties of organochlorines which differ in properties and origin, in the lake ecosystems of the Bolshezemelskaya tundra (Nenets Autonomous Okrug, Russia). The purpose of this study was to evaluate and assess the levels, distribution characteristics and composition of organochlorines in the bottom sediments of small lakes located in the Adzva river basin in Pymvashor natural boundary (the northernmost location of the exit of thermal-mineral springs of the continental Europe) and in the adjacent area, outside this unique subarctic hydrothermal zone.In order to meet this goal, multi-method (hydrochemical, geochemical, etc.) research was carried out using standard generally approved laboratory practices with their adaptation to the study goals. The quantitative content and composition of the target individual organochlorines were determined by gas chromatographic method with electron-capture detection.The presence of chlorophenol compounds and polychlorinated benzenes (including persistent organic pollutants) was shown in the lakes sediments. The influence of specific microclimatic conditions of subarctic hydrothermal system on the composition and distribution of chlorophenol compounds in lake sediments was considered. In the small lake sediment core in Pymvashor natural boundary a reducing trend in the levels of organochlorines with depth has been recorded (conditioned among other things by the lithological features of bottom sediments). The chlorophenol compounds were found at highest concentrations (619.3–765.5 ng/g) in the sediment upper layers, rich in organic matter; chlorophenol composition was represented mainly by chlorinated phenols, most likely of biotic origin. A lower concentration (185.0 ng/g) of chlorophenol compounds of predominantly abiogenic origin was determined in the lake sediments outside hydrothermal system. The presence and levels of persistent organochlorine pollutants (pentachlorophenol 0.1–2.4 ng/g; hexa- and pentachlorobenzenes 0.4–3.6 ng/g) in the lake sediments were associated with long-range atmospheric transport from various origin sources in nearby regions and low-latitude territories.

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