scholarly journals Hydrodynamic Processes of the Irtysh River Mouth Areas

2015 ◽  
pp. 44
Author(s):  
Keyword(s):  
River Mouth ◽  
Ob River ◽  
Hydrodynamic Processes ◽  
Irtysh River ◽  
River Mouth Areas ◽  
The Irtysh River

Issues concerning the Irtysh River and the Ob River interaction and the backwater processes during the Irtysh River mouth areas depressions formation (their origin is still disputable) have been discussed. The backwaters hydro/climatic and geo/morphologic factors have been analyzed; a hydrodynamic hypothesis to explain river moth areas backwaters has been suggested.

scholarly journals Features of the first intermediary host distribution of Opisthorchis felineus near the major cities of KhMAO–Ugra (Western Siberia)

2019 ◽  
Vol 9 (4) ◽  
pp. 481-501
Author(s):  
Aleksandra Maiurova ◽  
Marina Kustikova
Keyword(s):  
Population Density ◽  
Western Siberia ◽  
Hydrological Regime ◽  
Opisthorchis Felineus ◽  
Ob River ◽  
Host Distribution ◽  
Bithynia Tentaculata ◽  
Irtysh River ◽  
Khanty Mansi Autonomous ◽  
The Irtysh River

In this paper the dynamics of invasion extensiveness of freshwater Bithyniidae snails by trematodes Opisthorchis felineus (cat fluke) in the waters of Khanty-Mansi Autonomous Area was determined. The study was conducted for the Ob river (Surgut) and the Irtysh river (Khanty-Mansiysk) for 7 years. As a result of the study, it was determined that the population density of snails and the extensiveness of their invasion by O. felineus trematodes are higher in the Irtysh River, which is associated with the hydrological regime of the river. Indicators of invasion extensiveness are higher for Bithynia tentaculata snails than Bithynia troscheli.

scholarly journals Phytoplankton as an indicator of the current ecological status of the Ob River

2021 ◽  
Vol 7 ◽  
pp. 573-591
Author(s):  
Natalya N. Barsukova ◽  
Olga P. Bazhenova ◽  
Larisa G. Kolesnichenko
Keyword(s):  
Species Composition ◽  
Trophic Status ◽  
Ecological Status ◽  
Taxonomic Structure ◽  
Phytoplankton Abundance ◽  
Ob River ◽  
Centric Diatoms ◽  
Dominant Complex ◽  
Irtysh River ◽  
The Irtysh River

The species composition, taxonomic structure, and the dominant complex of algae, and the distribution of phytoplankton abundance in the studied watercourse were identified based on data obtained for phytoplankton from the Ob River (from Tomsk to Salekhard) in summer 2019. Green algae (division Chlorophyta) make up the basis of the phytoplankton abundance in the river. The dominant complex is represented mainly by centric diatoms (genera Aulaсoseira, Cyclotella, Stephanodiscus) and non-heterocyst forms of cyanoprokaryotes (genus Aphanocapsa). The numbers and biomass of phytoplankton gradually decrease downstream of the Ob River; below the confluence of the Irtysh River, the edge effect occurs: increase in the diversity and density of organisms at the boundaries of ecosystems. Compared to the previous studies, the proportion of green and euglena algae, and cyanoprokaryotes in the taxonomic spectrum of phytoplankton increased, the composition of the dominant complex enriched, including due to non-heterocyst forms of cyanoprokaryotes, and the trophic status of the river increased to the category of eutrophic waters.

A stonefly species extinct in Europe (Taeniopteryx araneoides Klapalek, 1902, Taeniopterygidae, Plecoptera) is thriving in the Irtysh River in West Siberia and North Kazakhstan

Zootaxa ◽  
2017 ◽  
Vol 4247 (2) ◽  
pp. 141 ◽  
Author(s):  
OLEG E. KOSTERIN ◽  
NAZYMGUL AKIMBEKOVA ◽  
VLADIMIR V. DUBATOLOV ◽  
IGNAC SIVEC
Keyword(s):  
Anthropogenic Impacts ◽  
West Siberia ◽  
Large Rivers ◽  
Geographical Range ◽  
Central Siberia ◽  
Irtysh River ◽  
The Irtysh River

Taeniopteryx araneoides Klápalek, 1902, a stonefly species with brachypterous males, known historically from the Danube, Elbe, and Dniester rivers, but considered to be extinct at least in Europe for more than a century. This species has also been doubtfully reported from Krasnoyarsk, Central Siberia. However, we report this species to be still thriving in the Irtysh River at the cities of Omsk (West Siberia, Russia) and Pavlodar (North Kazakhstan). The occurrence of this species reported least fifty years ago from the Yenisey River at Krasnoyarsk, Russia is considered possible. Unlike the widespread Palaearctic T. nebulosa (Linnaeus, 1758) that occurs in a broad range of stream types, T. araneoides is a potomon species, apparently confined to large rivers. In this habitat, it appears vulnerable to anthropogenic impacts and may be unable to compete with T. nebulosa. The construction of dams and reservoirs has apparently extirpated T. araneoides from most of its former geographical range. 

scholarly journals Attempt to Define the Complexes of Bat Ectoparasites in the Boreal Palaearctic Region / Попытка выделения комплексов эктопаразитов летучих мышей бореальной Палеарктики

2015 ◽  
Vol 49 (1) ◽  
pp. 75-86 ◽  
Author(s):  
M. V. Orlova ◽  
O. L. Orlov
Keyword(s):  
Far East ◽  
Palaearctic Region ◽  
Taiga Zone ◽  
The West ◽  
Bat Flies ◽  
The Family ◽  
Gamasid Mites ◽  
Faunal Complexes ◽  
Irtysh River ◽  
The Irtysh River

Abstract The article presents the most complete data on the distribution of ectoparasites in the boreal Palaearctics (gamasid mites of the genera Spinturnix, Macronyssus, and Steatonyssus, bat flies of the family Nycteribiidae, fleas of the family Ischnopsyllidae) and its preferences for the hosts. On the basis of these data as well as the data for the resettlement of bats in Eurasia 30 species of boreal bat ectoparasites combined into three faunal complexes (Transpalaearctic, European-Ural and Siberian-Far East) and two groups (European-Ural species, penetrating to the east and Siberian-Far East, penetrating to the west). The boundary between the European-Ural and Siberian-Far East faunal complexes is situated presumably along the Irtysh River. The resulting zoning provides a new look at the parasitocenosis of ectoparasites in the taiga zone of the Palaearctics.

scholarly journals CHARACTERISTIC OF HARD TO IDENTIFY GENUS ACIPENSER SPECIES IN THE IRTYSH RIVER

2018 ◽  
pp. 90-98 ◽  
Author(s):  
Andrey Stepanovich Aldokhin ◽  
Gleb Igorevich Volosnikov
Keyword(s):  
Water Area ◽  
Bone Plates ◽  
Similar Species ◽  
Summer Period ◽  
Sturgeon Species ◽  
Irtysh River ◽  
June July ◽  
The Irtysh River

In the summer period (June-July) of 2018 on the Irtysh river (the Tobolsk region) in the control catches of sterlet there were found specimens with pronounced differences from individuals inhabiting this water area. Differences were found in the form of bone plates and linear-weight characteristics. Later, local fishermen reported on many cases of specimens having the above differences. Reports about the similar species came from the Uvat region. In order to establish the belonging of these individuals to a particular family there have been investigated meristic features which are considered diagnostic for sturgeon species, as well as for hybrids. In the result of the study there was made a conclusion about belonging of these specimens to the genus Acipenser and, most likely, to the sterlet species.

scholarly journals Modeling Snow Depth and Snow Water Equivalent Distribution and Variation Characteristics in the Irtysh River Basin, China

2021 ◽  
Vol 11 (18) ◽  
pp. 8365
Author(s):  
Liming Gao ◽  
Lele Zhang ◽  
Yongping Shen ◽  
Yaonan Zhang ◽  
Minghao Ai ◽  
...  
Keyword(s):  
Snow Cover ◽  
River Basin ◽  
Snow Depth ◽  
Snow Water Equivalent ◽  
Snow Accumulation ◽  
Implicit Scheme ◽  
Snow Water ◽  
Irtysh River ◽  
Simulation Results ◽  
The Irtysh River

Accurate simulation of snow cover process is of great significance to the study of climate change and the water cycle. In our study, the China Meteorological Forcing Dataset (CMFD) and ERA-Interim were used as driving data to simulate the dynamic changes in snow depth and snow water equivalent (SWE) in the Irtysh River Basin from 2000 to 2018 using the Noah-MP land surface model, and the simulation results were compared with the gridded dataset of snow depth at Chinese meteorological stations (GDSD), the long-term series of daily snow depth dataset in China (LSD), and China’s daily snow depth and snow water equivalent products (CSS). Before the simulation, we compared the combinations of four parameterizations schemes of Noah-MP model at the Kuwei site. The results show that the rainfall and snowfall (SNF) scheme mainly affects the snow accumulation process, while the surface layer drag coefficient (SFC), snow/soil temperature time (STC), and snow surface albedo (ALB) schemes mainly affect the melting process. The effect of STC on the simulation results was much higher than the other three schemes; when STC uses a fully implicit scheme, the error of simulated snow depth and snow water equivalent is much greater than that of a semi-implicit scheme. At the basin scale, the accuracy of snow depth modeled by using CMFD and ERA-Interim is higher than LSD and CSS snow depth based on microwave remote sensing. In years with high snow cover, LSD and CSS snow depth data are seriously underestimated. According to the results of model simulation, it is concluded that the snow depth and snow water equivalent in the north of the basin are higher than those in the south. The average snow depth, snow water equivalent, snow days, and the start time of snow accumulation (STSA) in the basin did not change significantly during the study period, but the end time of snow melting was significantly advanced.

scholarly journals Chemical and environmental assessment of the bottom sediments in the Irtysh River (Tyumen Region, Russian Federation)

Vestnik MGTU ◽  
2019 ◽  
Vol 22 (1) ◽  
pp. 177-187
Author(s):  
E. S. Zemtsova ◽  
◽  
G. S. Alimova ◽  
A. Yu. Tokareva ◽  
◽  
...  
Keyword(s):  
Russian Federation ◽  
Bottom Sediments ◽  
Environmental Assessment ◽  
Irtysh River ◽  
The Irtysh River
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