Characterization of Terrigenous and Carbonate Reservoirs in the Western Angara-Lenga Step, from Geochemical Data

Pastukhov, N.P.; Kalinina, О. V.

doi:10.3997/2214-4609.20141748

Cited by 2 publications

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“…Much more detailed work carried out in the late 50s and early 60s of the last century by V.D. Pastukhov [9] indicates a significant decrease in the abundance of Mergansers -from 200 birds to single encounters. The total number of birds at this time ranged from 4,400 to 7,000 birds and their basis was Goldeneye [9].…”

Section: Resultsmentioning

confidence: 99%

“…Pastukhov [9] indicates a significant decrease in the abundance of Mergansers -from 200 birds to single encounters. The total number of birds at this time ranged from 4,400 to 7,000 birds and their basis was Goldeneye [9]. However, in the second half of the 60s of the XX century, the total number of birds reached 3,500 Goldeneyes, Long-tailed Duck were marked by single individuals, and the remaining species were not found here [10].…”

Section: Resultsmentioning

confidence: 99%

“…The same applies to the second plot wintering, where it was necessary to examine the entire valley of the Angara River completely. As a rule, during the day, records were carried out on the polynya in the source, and in the evening during the flight of birds to Baikal [5][6][7][8][9][10][11]. In both cases, there is a strong underestimation of the abundance of birds.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the collected materials up to the second half of the XX century allow only an approximate estimate of the main directions of population change. At the same time, on their basis, it is possible to get a fairly complete picture of the dynamics of the species composition of birds of this "cold" wintering in Eastern Siberia [2,[4][5][6][7][8][9][10][11]. The first reliable results on the number of birds were collected in the second half of the XX century.…”

Section: Introductionmentioning

confidence: 99%

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Cold wintering of coastal birds in the source and upper reaches of the Angara river: Changes in abundance and species structure in the conditions of a sharp climate warming

Mel’nikov

2023

BIO Web Conf.

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Based on long-term research (1972-2023) and analysis of literature data, materials on the dynamics of the number and species structure of wintering shorebirds and waterfowl on cold wintering in the source and upper reaches of the Angara River (up to the town of Usolye-Sibirskoye) are presented. This is the largest cold wintering of coastal birds in Eastern Siberia – up to 55.0-60.0 thousand birds, the formation of which is due to very specific conditions of the upper reaches of the Angara River. This is the thermal refugium of the Upper Angara region, which ensures the accumulation of birds at the end of migration in more favorable areas of this region. It is divided into two sections: the first stretches from the source of the Angara River to the village of Taltsy, the second from the Irkutsk hydroelectric dam to the town of Usolye-Sibirskoye, and in warm winters slightly below it. On the basis of special works on the study of the dynamics of the number and species structure of birds, special methods have been developed: accounting on ice holes, accounting during the evening flight of birds to the lake Baikal (during cold periods) and accounting using a hovercraft (SVP) (during periods of severe climate warming). The basis of wintering birds is the Goldeneye Bucephala clangula (from 95.0% to 98.5% of their total species structure). However, the structure of secondary species can increase dramatically and we have noted new species that have never been found here before. The collected materials allow us to understand the reasons that determine the dynamics of the number and species structure of coastal birds in the “cold” wintering grounds of Inner Asia in the conditions of a sharp warming of the climate

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cold wintering of coastal birds in the source and upper reaches of the Angara river: Changes in abundance and species structure in the conditions of a sharp climate warming

Mel’nikov

2023

BIO Web Conf.

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“…Heavy metals (HM) that affect water ecosystems appear as the main environmental hazard, as they deteriorate water quality, accumulate in hydrobionts, interfere with biodiversity and the structure of populations [2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Technogenesis and Ecological State of Natural Waters in Eastern Transbaikalia

Цыбекмитова

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The research on the state of water ecosystems is significant in terms of future biological impacts of natural and anthropogenic effects. The key branches of natural resources management in Eastern Transbaikalia (agriculture, hydraulic power industry) are based on using water resources. The findings show that technogenesis affects surface waters of the region. Alluvial gold mining represents a significant part of mining industry. Gold mining in river channels results in run-of-stream diversion and interferes with the ecosystem of watercourses. A newly formed structure of a water ecosystem is not favourable for self-purification capacity of rivers. This leads to pollutants accumulation in water objects and deteriorates ecological state of watercourses. Natural components in the technoecosystem of hydropower objects in Eastern Transbaikalia are Lake Kenon and the Kharanor Reservoir. Although the catchment area is polluted by TPP-1, the ecosystem of the lake is still capable of self-purification due to biodiversity of hydrobionts. Under the dry climate in recent years, the Kharanor Reservoir ecosystem turned as rather unstable due to constant refilling from the Onon River. However, generally, pigment indices show physiological activity of primary producers of organic matter.

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Characterization of Terrigenous and Carbonate Reservoirs in the Western Angara-Lenga Step, from Geochemical Data

Cited by 2 publications

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Cold wintering of coastal birds in the source and upper reaches of the Angara river: Changes in abundance and species structure in the conditions of a sharp climate warming

Cold wintering of coastal birds in the source and upper reaches of the Angara river: Changes in abundance and species structure in the conditions of a sharp climate warming

Technogenesis and Ecological State of Natural Waters in Eastern Transbaikalia

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