scholarly journals Discovery of Nymphomyia larval remains (Insecta: Diptera: Nymphomyiidae) in five hundred year-old bottom sediments of Oron lake (Eastern Siberia, Russia)

Invertzool ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 219-225
Author(s):  
I. V. Enushchenko ◽  
E. A. Makarchenko
Keyword(s):  
Bottom Sediments ◽  
Eastern Siberia

Mercury in bottom sediments of the Amur River, its flood-plain lakes and estuary, Eastern Siberia

2009 ◽  
Vol 168 (1-4) ◽  
pp. 133-140 ◽  
Author(s):  
Fyodor S. Kot ◽  
Konstantin G. Bakanov ◽  
Nikolay A. Goryachev
Keyword(s):  
Bottom Sediments ◽  
Flood Plain ◽  
Eastern Siberia ◽  
Amur River ◽  
The Amur River

scholarly journals Environmental changes in last 200 years from results of bottom-sediments analysis of lake Oron (Kodar ridge, Eastern Siberia, Russia)

2019 ◽  
Vol 46 (4) ◽  
pp. 447-456
Author(s):  
I. V. Enushchenko
Keyword(s):  
Bottom Sediments ◽  
Environmental Changes ◽  
Environmental Studies ◽  
Eastern Siberia ◽  
Thick Sample ◽  
Climate Effect ◽  
Chironomidae Larvae ◽  
Regional Landscape

Records of bottom sediments accumulated in Lake Oron over the last 200 years were analyzed. Chironomidological and palynological examinations of Lake Oron bottom sediments, based on a 10-cm-thick sample from drilling, were conducted. The dynamic climate effect on fauna was studied by examination of Chironomidae larvae from the lake. The lake’s hydrological status and the local and regional landscape and vegetation were also determined. As a result of these environmental studies, the effect of Lake Oron’s nearshore conversion to bog on the process of the lake water’s acidification was assumed, and the approximate dates of the process were defined as beginning in the 1940s.

scholarly journals New results of a palynological study of the Lake Doroninskoe sediments (Eastern Siberia, Transbaikalia)

2022 ◽  
Vol 962 (1) ◽  
pp. 012033
Author(s):  
S A Reshetova
Keyword(s):  
Bottom Sediments ◽  
Pollen Analysis ◽  
Meromictic Lake ◽  
Sediment Layer ◽  
Eastern Siberia ◽  
Modern Times ◽  
Middle Holocene ◽  
Time Period ◽  
Palynological Study

Abstract This article presents the results of the study of the bottom sediments of the meromictic Lake Doroninskoe. For the study, the method of spore-pollen analysis was used. The record showed that during the accumulation of 65 cm of the sediment layer in the Chita-Ingodinskaya depression, pine and larch predominated along the ridges, with steppe and meadow associations in the lower parts of the depression. According to regional correlations, the distribution of light-coniferous-taiga vegetation in Transbaikalia occurred as early as the Middle Holocene, and it did not undergo cardinal changes until modern times. According to these data, sediments may have accumulated during this time period.

Chapter 11: General epidemiology of TBE

2020 ◽  
Keyword(s):  
Eastern Siberia ◽  
Genetic Lineages ◽  
Phylogenetic Studies ◽  
Tick Borne Encephalitis ◽  
Natural Foci ◽  
Genetic Sequences ◽  
Tick Borne Encephalitis Virus ◽  
Almost All ◽  
Far Eastern ◽  
Reservoir Hosts

Tick-borne encephalitis virus (TBEV) exists in natural foci, which are areas where TBEV is circulating among its vectors (ticks of different species and genera) and reservoir hosts (usually rodents and small mammals). Based on phylogenetic studies, four TBEV subtypes (Far-Eastern, Siberian, European, Baikalian) and two putative subtypes (Himalayan and “178-79” group) are known. Within each subtype, some genetic lineages are described. The European subtype (TBEV-EU) (formerly known also as the “Western subtype”) of TBEV is prevalent in Europe, but it was also isolated in Western and Eastern Siberia in Russia and South Korea. The Far-Eastern subtype (TBEV-FE) was preferably found in the territory of the far-eastern part of Eurasia, but some strains were isolated in other regions of Eurasia. The Siberian (TBEV-SIB) subtype is the most common and has been found in almost all TBEV habitat areas. The Baikalian subtype is prevalent around Lake Baikal and was isolated several times from ticks and rodents. In addition to the four TBEV subtypes, one single isolate of TBEV (178-79) and two genetic sequences (Himalayan) supposed to be new TBEV subtypes were described in Eastern Siberia and China. The data on TBEV seroprevalence in humans and animals can serve as an indication for the presence or absence of TBEV in studied area.

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.

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.

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