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 Исследование влияния паводков и некоторых биотических факторов на распространение моллюсков семейства Bithyniidae

2019 ◽  
Vol 11 (1) ◽  
pp. 5
Author(s):  
А.С. Маюрова ◽  
М.А. Кустикова
Keyword(s):  
Water Pollution ◽  
Population Density ◽  
Indigenous People ◽  
Intermediate Hosts ◽  
Opisthorchis Felineus ◽  
Pollutant Concentrations ◽  
Study Sites ◽  
Khanty Mansi Autonomous

The dependence of population density of Bithyniidae snails, which are the first intermediate hosts of Opisthorchis felineus (cat fluke), on maximum flood levels, pollutant concentrations, and the presence of leeches was investigated in water basins of the Khanty-Mansi Autonomous Area. Study sites were at the rivers Ob (Surgut environ), Irtysh (Khanty-Mansiysk environ) and Bolshoy Yugan (Ugut village). The prevalence of the mollusk was shown to correlate positively with flood levels and negatively with water pollution and the presence of leeches that feed on snails. These observations may be useful for planning measures aimed to control opisthorchiasis in indigenous people that consume fish infected with opistorchis flukes.

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 Annotated Checklist of the Fishes of Nizhnevartovsk District

2016 ◽  
pp. 45-53
Author(s):  
F. Ovechkin
Keyword(s):  
Introduced Species ◽  
River Basin ◽  
Western Siberia ◽  
Abramis Brama ◽  
Sander Lucioperca ◽  
Ob River ◽  
Bream Abramis Brama ◽  
Pike Perch ◽  
Annotated Checklist ◽  
Khanty Mansi Autonomous

The confirmed fishes of Nizhnevartovsk district waters (Russia, Western Siberia, Khanty–Mansi autonomous okrug (district)) comprise 24 species in 19 genera, 10 families, 6 orders and 2 classes found in Middle Ob River basin. There are also 5 species whose presence in Nizhnevartovsk district waters needs confirmation by the described specimens. The most diverse order is the Cypriniformes with 11 confirmed species (45.9%) followed by Salmoniformes with 5 species (20.8%), Perciformes (3 species, 12.5%), Petromyzoniformes (2 species, 8.3%), Acipenseriformes (2 species, 8.3%) and Gadiformes with 1 species (4.2%). Of the 5 introduced species (including three require confirmation), the freshwater bream Abramis brama (Linnaeus, 1758) and the pike–perch Sander lucioperca (Linnaeus, 1758) naturalized and are constantly found.

scholarly journals Landscape, Soil, Lithology, Climate and Permafrost Control on Dissolved Carbon, Major and Trace Elements in the Ob River, Western Siberia

2021 ◽  
Author(s):  
Yuri Kolesnichenko ◽  
Larisa G. Kolesnichenko ◽  
Sergey N. Vorobyev ◽  
Liudmila S. Shirokova ◽  
Igor P. Semiletov ◽  
...  
Keyword(s):  
Trace Elements ◽  
Western Siberia ◽  
Steppe Zone ◽  
Major And Trace Elements ◽  
Forest Steppe ◽  
Dissolved Carbon ◽  
Ob River ◽  
Unknown Factor ◽  
Irtysh River ◽  
Riverine Systems

Assuming that climate warming in the WSL will lead to a northward shift of the forest and permafrost boundaries, a “substituting space for time” approach predicts an increase in concentration of DIC and labile major and trace elements and a decrease of the transport of DOC and low soluble trace metals in the form of colloids in the main stem of the Ob River. However, an unknown factor is the change in hydrochemistry of the largest southern tributary, the Irtysh River, which is impacted by permafrost-free steppe and forest-steppe zone. Overall, seasonally-resolved transect studies of large riverine systems of western Siberia are needed to assess the hydrochemical response of this environmentally-important territory to on-going climate change.

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.

scholarly journals Characteristic properties of the genesis of Alnus incana (L.) Moench. associations in the south of Western Siberia

2020 ◽  
Vol 217 ◽  
pp. 09012
Author(s):  
Boris Kharitontcev ◽  
Elena Popova
Keyword(s):  
Western Siberia ◽  
Higher Plants ◽  
Composition Analysis ◽  
Alnus Incana ◽  
Anthropogenic Influences ◽  
Grass Cover ◽  
The South ◽  
Synanthropic Species ◽  
Irtysh River ◽  
The Irtysh River

The associations formed by Alnus incana (L.) Moench. in the south of Western Siberia are limited to the middle and lower reaches of the Irtysh river in the Tyumen region (Tobolsk district, Russia). The paper describes Alnetum pteridiosum, Alnetum urticosum, Alnetum еquisetosum, Alnetum coricosum, Alnetum coricoso – еquisetosum, Alnetum coricoso – oxalidosum, Alnetum curtico – еquisetosum, Alnetum еquisetoso – miliosum, Alnetum coricosa – stellariosum, Alnetum urtico – aegopodiosum, Alnetum urtico – stellariosum, Alnetum–cirsiosum, Alnetum cystopteriosum, Alnetum urtico – miliosum, Alnetum poо – urticosum, Alnetum chrysospleniosum, Alnetum corydaliosum, Alnetum impatieno - urticosum and Alnetum stellariosum associations. In these associations, more than a hundred of species of higher plants grow. The species composition analysis showed that they are mesothermal and hydrophilic, the shrub layer is not typical for them, and the grass cover of alder forests is not uniform in origin. During the formation of Alnetum association they interact with taiga, birch and linden forests through mutual exchange of species, and also experience anthropogenic influences, accompanied by the penetration of synanthropic species.

Aquatic vegetation (Lemnetea, Potametea) of the Ob river floodplain (within the limits of Aleksandrovskiy district of Tomsk region)

2008 ◽  
pp. 68-75 ◽  
Author(s):  
G. S. Taran
Keyword(s):  
Western Siberia ◽  
Aquatic Vegetation ◽  
Ceratophyllum Demersum ◽  
River Floodplain ◽  
Ob River ◽  
Tomsk Region ◽  
Potamogeton Natans

In the Ob river floodplain between the mouths of its tributaries Vakh and Tym (within the limits of Aleksandrovskiy district of Tomsk region), phytocoenoses belonging to 9 associations and 2 communities of Braun-Blanquet classification vegetation classes are listed. Class Lemnetea is represented by associations Ricciocarpetum natantis (Segal 1963) Tx. 1974, Lemnetum trisulcae Soó 1927, Stratiotetum aloidis Miljan 1933; class Potametea is done by asso­ciations Potametum perfoliati Koch 1926, Myriophylletum sibirici Taran 1998, Myriophylletum verticillati Soó 1927, Potametum graminei Koch 1926, Potametum pectinati Carstensen 1955, Nymphoidetum peltatae (All. 1922) Bellot 1951, as well as Sagittaria natans and Potamogeton natans—Ceratophyllum demersum communities. The syntaxa distribution in Western Siberia and adjoining territories is characterized.

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