scholarly journals Ecological and Physiological Patterns of Selenium Migration within the Volga River Ecosystem

2019 ◽  
Author(s):  
Nikolay A Pudovkin ◽  
Denis A Pyrikov ◽  
Petr V Smutnev
Keyword(s):  
Selenium Concentration ◽  
Left Bank ◽  
Maximal Concentration ◽  
River Ecosystem ◽  
Volga River ◽  
River Bank ◽  
Bottom Soil ◽  
Migration Analysis ◽  
The Right

The article presents the results of selenium migration analysis within river ecosystem. Maximal concentration of selenium was observed near Tomakovsky and Nazarovsky ravines within Saratov territory. The concentration of this microelement at the right river bank was slightly higher than at the left bank. The concentration of selenium in bottom soil ranged from 0.062–0.099 μg/g. Maximal concentration of microelement was found in clasping-leaved pondweed. Selenium concentration in fish bodies depends on their species and nutrition. Maximal concentration of microelement was found in crucian carps, and minimal – in rudds.

scholarly journals Materials for the Characterization of the Settlement System in the Samara Volga Region in the Golden Horde Period

2021 ◽  
Vol 2 (36) ◽  
pp. 178-192
Author(s):  
Anna F. Kochkina ◽  
◽  
Dmitriy A. Stashenkov ◽  
Keyword(s):  
Volga Region ◽  
Left Bank ◽  
Volga River ◽  
Middle Volga Region ◽  
Eastern Zone ◽  
Territorial Structure ◽  
The Usa ◽  
Northern Zone ◽  
The Right

Among the sites of the Golden Horde period of the Middle Volga region, a special group consists of the sites of the Samara region, which includes the Samara Luka of the Volga and the basins of the Usa, Samara, Kinel, and Sok rivers. The analysis of the topography of the sites in the context of the natural and geographical characteristics of the area under consideration allowed us to determine its territorial structure. Based on the features of settlement placement, a zonal zoning model is proposed for the right-bank and left-bank sections of the Samara Volga region. On the territory of the righ-bank district, three microdistricts are allocated: 1) Usa microdistrict;, 2) microdistrict of the inner part of the Samara Luka; 3) microdistrict of the Syzranka River basin. In the left-bank, taking into account the modern data of the territory, six microdistricts can be distinguished. 1) Northern на trans-Volga microdistrict located in the northern zone close to the bank of the Volga River; 2) Samara-Volga microdistrict, including sites of the mouth of the Samara River, Sok, the bank of the Volga River; 3) Sok microdistrict, sites are located along the bed of the Sok and Kondurcha rivers; 4) Kinel microdistrict, sites are located along the river Bolshoi Kinel to the confluence with the Samara River; 5) Samara steppe microdistrict in the eastern zone of the region under consideration; 6) Southern trans-Volga microdistrict. Each microdistrict is characterized by a corresponding supporting framework of settlement, which is associated with the peculiarities of the functioning of sites.

scholarly journals Potential Range of Bulbocodium versicolor (Ker-Gawl.) Spreng. (Colchicaceae, Liliopsida) in Russia

2020 ◽  
pp. 241-247
Author(s):  
A. S. Kashin ◽  
A. S. Parkhomenko ◽  
L. V. Kulikova ◽  
N. A. Petrova ◽  
I. V. Shilova ◽  
...  
Keyword(s):  
Climatic Conditions ◽  
European Russia ◽  
Potential Range ◽  
Left Bank ◽  
Occurrence Probability ◽  
Volga River ◽  
Volga Upland ◽  
Bioclimatic Model ◽  
The Right ◽  
Favorable Conditions

The article presents a bioclimatic model of the potential range of Bulbocodium versicolor in European Russia. To build the model, we analyzed a matrix containing 166 B. versicolor localities in the studied region; the analysis was carried out in the SDMtoolbox program using the climatic paramaters from the WorldClim open database. The model demonstrates that, given the available dataset on the modern climatic conditions, B. versicolor may occur in a wider geographical range comprising, at the very least, the Belgorod, Voronezh, Volgograd, Lipetsk, Penza, Rostov and Saratov provinces. Also, within European Russia, the most favorable conditions for B. versicolor are found in most of the Voronezh and Volgograd provinces as well as in some areas of the Right Bank and Left Bank of the Volga River adjacent to the Volga Upland (in the Saratov province). The maximum occurrence probability is 70–100% while the average occurrence probability is 40– 60%. The maximum contribution to the model is made by the precipitation of the warmest and most humid quarter (June–August); a smaller contribution is made by the average temperature of the coldest (December–February) and warmest (June – August) quarters as well as by the average annual precipitation. The least contribution is made by the precipitation of the most humid month (July) and the driest quarter (March–May). Finally, we conclude that bioclimatic model facilitates a better understanding of the geographical distribution of the species in question.

scholarly journals Morphogenetic analysis of erosion topography the right Volga river bank (Volgograd region, Russia)

2019 ◽  
pp. 88-101 ◽  
Author(s):  
A. V. Seleznevа ◽  
I. S. Dedovа
Keyword(s):  
European Part ◽  
Economic Activities ◽  
Volga River ◽  
River Bank ◽  
Erosion Processes ◽  
Volgograd Region ◽  
European Part Of Russia ◽  
The Right ◽  
Geomorphological Features ◽  
Morphogenetic Analysis

The article is devoted to a detailed morphogenetic analysis of erosion topography of the right Volga river bank (Volgograd region, Russia). The estimation of the factors in the development of erosion processes: lithological, geomorphological, climatic, biotic. It is established that the general trends of the development and the propagation of gully systems depend on the zonal conditions, and their specificity from structural-lithological and geomorphological features of the area. The actual basis for the work, based on data from field observations, interpretation of satellite imagery, morphometric processing of topographic maps. The obtained results were used for compiling maps, morphometric characteristics of the relief and zoning of the right bank of the Volgograd city according to the intensity of erosion processes. It was established that the studied area is among the most erosion-affected territories in the European part of Russia with the average erosion density of the network from 0.10.3 up to 34 km/km2. Comparison of factors determining the intensity of the evolution and morphology of gully systems led to the conclusion that modern intensification of erosion is the result of economic activities.

scholarly journals Estimation and Prediction of Riverbank Erosion Susceptibility and Shifting Rate Using DSAS, BEHI, and REBVI Models: Evidence from the Lower Ganga River in India

2021 ◽  
Author(s):  
Md. Hasanuzzaman ◽  
Biswajit Bera ◽  
Aznarul Islam ◽  
Pravat Kumar Shit
Keyword(s):  
Land Use Planning ◽  
Anthropogenic Activities ◽  
Hazard Index ◽  
Bank Erosion ◽  
Ganga River ◽  
Hydraulic Pressure ◽  
Left Bank ◽  
River Bank ◽  
Riverbank Erosion ◽  
The Right

Abstract The process of riverbank erosion (RE) is often accelerated by natural events and anthropogenic activities leading to the transformation of this natural process to natural hazard. The present study aims to estimate bank erosion rate and prediction of the lower Ganga River in India using digital shoreline analysis system (DSAS) model. The prediction of RE susceptibility mapping has been generated using three ensemble models such as DSAS, bank erosion hazard index (BEHI), and river embankment breaching vulnerability index (REBVI). For the study satellite images and field data (bank materials, geotechnical parameters, embankment structure, hydraulic pressure etc.) have been used to recognize the river bank position and BEHI and REBVI scores. During 1973-2020, the average bank erosion and accretion rate was found 0.059 km/y and 0.022 km/y at the left bank while 0.026 km/y and 0.046 at the right bank respectively. The prediction results illustrated that the very high vulnerable condition of 06 villages and 21 villages for high vulnerable due to left bank erosion. BEHI and REBVI scores have been the significant performance of understanding and identification of RE vulnerable areas. The long-term (2020-2045) average erosion and deposition rate was predicted at 0.135 km/y and 0.024 km/y at the left bank and 0.043 km/y and 0.045 km/y at the right bank respectively. The prediction accuracy and validation of models were measures by statistical techniques such as student’s t-test, RMSE, and R2 values. This study would be help planners and decision makers the spatial guidelines to understanding future trends of bank erosion and shifting rate for land-use planning and management strategies to protect riverbank.

scholarly journals Assessment of Bank Erosion, Accretion and Channel Shifting Using Remote Sensing and GIS: Case Study – Lower Course of the Bosna River

2016 ◽  
Vol 35 (1) ◽  
pp. 81-92 ◽  
Author(s):  
Novica Lovric ◽  
Radislav Tosic
Keyword(s):  
Remote Sensing ◽  
Bank Erosion ◽  
Remote Sensing And Gis ◽  
Left Bank ◽  
Channel Migration ◽  
River Bank ◽  
Migration Rates ◽  
Lateral Channel ◽  
Channel Shifting ◽  
The Right

Abstract River bank erosion, accretion and lateral channel migration are the most important geomorphological processes, which attract a great deal of attention from river engineering scientist over the last century. in the presented study, we assessed how the river’s shape and position have changed during 1958-2013 period using remote sensing and GIS. We have identified that the total area of bank erosion during given period equalled 8.3430 km2, of which 3.2593 km2 were on the left bank and 5.0837 km2 on the right bank. The total area of bank accretion from 1958 to 2013 equalled 10.7074 km2, of which 5.4115 km2 was on the left bank and 5.2958 km2 on the right bank. The Bosna riverbed average movement in the period 1958-2013 was established in the amount of 132.4 m. During this period, the average lateral channel migration was 2.5 m per year. The data presented here are significant for practical issues such as predicting channel migration rates for engineering and planning purposes, soil and water management.

Prince Henri d'Orleans (1867–1901): geographical and botanical exploration between inner Asia and southwest China

1978 ◽  
Vol 8 (4) ◽  
pp. 399-399
Author(s):  
WILLIAM GARDENER
Keyword(s):  
Southwest China ◽  
Western China ◽  
Left Bank ◽  
Inner Asia ◽  
Botanical Exploration ◽  
Western Yunnan ◽  
Westerly Direction ◽  
Chinese Province ◽  
The Right ◽  
North Western

Prince Henri d'Orleans, precluded by French law from serving his country in the profession of arms, had his attention turned early towards exploration. In 1889, accompanied by the experienced traveller Gabriel Bonvalet, he set out from Paris to reach Indo-China overland by way of Central Asia, Tibet and western and south western China. The journey made contributions in the problems of the whereabouts of Lap Nor and the configuration of the then unexplored northern plateau of Tibet; and in botany it produced some species new to science. The party reached Indo-China in 1890. In 1895, having organised an expedition better equipped for topographical survey and for investigations in the fields of natural history and ethnography, Prince Henri set out from Hanoi with the intention of exploring the Mekong through the Chinese province of Yunnan. After proceeding up the left bank of the Salween for a brief part of its course and then alternating between the right and left banks of the Mekong as far up as Tzeku, the party found it advisable to enter Tibet in a north westerly direction through the province of Chamdo and instead crossed the south eastern extremity of the country, the Zayul, by a difficult track which led them to the country of the Hkamti Shans in present day Upper Burma, and thence to India completing a journey of 2000 miles, "1500 of which had been previously untrodden" (Prince Henri). West of the Mekong, the journey established that the Salween, which some geographers had claimed took its rise in or near north western Yunnan, in fact rose well north in Tibet, and that, contrary to previous opinions, the principal headwater of the Irrawaddy rose no further north than latitude 28°30'. Botanical collections were confined to Yunnan, where the tracks permitted mule transport, and they produced a number of species new to science and extended the range of distribution of species already known.

CHARACTERISTICS OF FREE-RADICAL PROCESSES IN THE ORGANISMS OF SOME PREDATORY FISH SPECIES IN DIFFERENT SEASONS OF THE YEAR

2017 ◽  
pp. 117-123
Author(s):  
Nikolay Aleksandrovich Pudovkin ◽  
Peter Vladimirovich Smutnev
Keyword(s):  
Fish Species ◽  
Catalase Activity ◽  
Perca Fluviatilis ◽  
Selenium Concentration ◽  
The Body ◽  
Predatory Fish ◽  
Volga River ◽  
Silurus Glanis ◽  
Average Value ◽  
Pike Perch

The authors of the article have studied the content of the elements of anti-oxidant system (malondialdehyde, catalase, selenium) in tissues of the internal organs (gills, intestine, muscles, liver, swimbladder, scales) in some species of predatory fish (pike Esox lucius (L., 1758), perch Perca fluviatilis (L., 1758), pike-perch Sander lucioperca (L., 1758), catfish Silurus glanis ) widespread in the basin of the Volga river in the Saratov region. The lowest concentration of malondialdehyde in organisms of the studied fish species is observed in fall and winter; the highest - in spring and summer. Catalase activity in gills tissue of a pike raised in 11.8%, cat-fish - 9.1%, pike-perch - 7.5%, perch - 7.8%. In fall (compared to winter) enzyme activity lowering in gonads of pike-perch makes 16.3%, in gonads of perch - 14.4%. In other tissues there were not observed any evident changes of catalase activity. Fish species under consideration are listed according to the average value of selenium concentration in organisms, µg/g: pike (0.208) > catfish (0.207) > pike-perch (0.196) > perch (0.178). According to the average value of the selenium accumulation in the body in different season all the studied species can be placed in the following order, µg/g: winter-pike (0.132) > pike-perch (0.136) > perch and catfish (0.142); spring - pike-perch (0.190) > perch (0.191) > pike (0.208) > catfish (0.209); summer - perch (0.186) > pike-perch (0.190) > catfish and pike (0.203); autumn - perch (0.193) > pike-perch (0.268) > > catfish (0.274) > pike (0.289).

The Calculation of Turbulent Diffusion Coefficients in Aquatic Ecosystems

2019 ◽  
Vol 70 (11) ◽  
pp. 3903-3907
Author(s):  
Galina Marusic ◽  
Valeriu Panaitescu
Keyword(s):  
Transport Equation ◽  
Turbulent Diffusion ◽  
Diffusion Coefficients ◽  
Aquatic Ecosystems ◽  
Specific Area ◽  
Left Bank ◽  
The Right ◽  
Prut River

The paper deals with the issues related to the pollution of aquatic ecosystems. The influence of turbulence on the transport and dispersion of pollutants in the mentioned systems, as well as the calculation of the turbulent diffusion coefficients are studied. A case study on the determination of turbulent diffusion coefficients for some sectors of the Prut River is presented. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of P�clet, calculated for each specific area: the left bank, the right bank and the middle of the river.

scholarly journals Isotope Signs (234U/238U, 2H, 18O) of Groundwater: An Investigation of the Existence of Paleo-Permafrost in European Russia (Pre-Volga Region)

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1838
Author(s):  
Evgeny Yakovlev ◽  
Igor Tokarev ◽  
Sergey Zykov ◽  
Stanislav Iglovsky ◽  
Nikolay Ivanchenko
Keyword(s):  
Isotopic Composition ◽  
European Russia ◽  
Zero Temperature ◽  
Middle Reach ◽  
Component Mixture ◽  
Volga River ◽  
The Third ◽  
The Right ◽  
Permafrost Thawing ◽  
Small Excess

The isotopic (234U/238U, 2H, 18O) and chemical composition of groundwater on the right bank of the Volga River along the middle reach (European Russia) was studied down to a depth of 400 m. These data allow diagnosis of the presence of a three-component mixture. The first component is modern/young fresh recharge water of the Holocene age. It has the isotopic composition of water δ18O → −12.9 ‰ and δ2H → −90 ‰, close to modern precipitations, and the equilibrium isotopic composition of uranium 234U/238U → 1 (by activity). The second component is slightly salted water of the late or postglacial period with δ18O → −17.0 ‰ and δ2H → −119 ‰, and a small excess of uranium-234 234U/238U ≈ 4. The third component is meltwater formed as result of permafrost thawing. It is brackish water with δ18O ≈ −15.0 ‰ and δ2H ≈ −110 ‰, and a maximum excess of uranium-234 234U/238U ≈ 15.7. The salinity of this water is associated with an increase of the SO42−, Ca2+ and Na+ content, and this may be due to the presence of gypsum in water-bearing sediments, because the solubility of sulfates increases at near-zero temperature. We explain the huge excess of uranium-234 by its accumulation in the mineral lattice during the glacial age and quick leaching after thawing of permafrost.

scholarly journals A successful case of biological invasion: the fish Cichla piquiti, an Amazonian species introduced into the Pantanal, Brazil

2008 ◽  
Vol 68 (4) ◽  
pp. 799-805 ◽  
Author(s):  
EK. Resende ◽  
DKS. Marques ◽  
LKSG. Ferreira
Keyword(s):  
National Park ◽  
Reproductive Period ◽  
Distribution Area ◽  
Left Bank ◽  
Amazonian Fish ◽  
Paraguay River ◽  
Turbid Waters ◽  
Successful Case ◽  
The Right ◽  
Flooded Areas

The "tucunaré", Cichla piquiti, an exotic Amazonian fish has become established along the left bank of the Paraguay River in the Pantanal. It was introduced by escaping from culture ponds in the Upper Piquiri River and spread downstream, along the lateral flooded areas of that river, continuing through the clear waters of the left bank of the Paraguay River and reaching south as far as the Paraguai Mirim and Negrinho rivers. Adult spawners have been found in the region, meaning that it is a self-sustained population. Reproduction occurs in the period of low waters. They were found feeding on fishes of lentic environments belonging to the families Characidae, Cichlidae and Loricariidae. Until the end of 2004, its distribution was restricted to the left bank of the Paraguay River, but in March 2005, some specimens were found on the right bank, raising a question for the future: what will be the distribution area of the tucunaré in the Pantanal? Information about its dispersion is increasing: it is known to be in the Tuiuiú Lake, Pantanal National Park and in the Bolivian Pantanal, all of them on the right bank of the Paraguay River. The hypothesis that the "tucunaré" could not cross turbid waters, such as in the Paraguay River, was refuted by these recent findings. Possibly, the tucunaré's capacity to lay more than one batch of eggs in a reproductive period, as well as its care of eggs and young, lead them to establish themselves successfully in new environments, as has been observed in the Pantanal and other localities.

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