Species diversity of planktonic and zoobenthic communities of floodplain lakes in the middle reaches of the Irtysh river in the Omsk region

2021 ◽  
pp. 17-30
Author(s):  
Tat’iana Aleksandrovna Litosh ◽  
Iuliia Vital’evna Tsygankova ◽  
Lyubov Semyonovna Vizer ◽  
Andrey Valeryevich Tsapenkov
Keyword(s):  
Species Diversity ◽  
Zooplankton Biomass ◽  
Floodplain Lakes ◽  
Small Scale ◽  
Average Abundance ◽  
Average Biomass ◽  
Irtysh River ◽  
Quantitative Indicators ◽  
Research Period ◽  
The Irtysh River

Based on hydrobiological studies conducted within the boundaries of the Omsk region, the species diversity of zooplankton and zoobenthic communities of floodplain lakes in the middle reaches of the Irtysh River is presented. The characteristics of zooplanktonic and zoobenthic invertebrates by qualitative and quantitative indicators are considered. The assessment of lakes by trophic and feeding capacity of reservoirs is given. The species diversity of the zooplankton and zoobenthic communities is shown. Zooplankton includes organisms of 20 genera from 11 families. The total number of species is 26, of which 12 are rotifers from two orders belonging to 5 families. Eleven species of branchiform crustaceans belonging to 10 genera from 4 families and three species of copepods belonging to 2 orders. It was found that the greatest species diversity was observed in the lake without the name of the Lubinsky district — 19, the smallest in such lakes as Staritsa, Peschanoe, and without the name of the Tavrichesky district — 12 taxa. The average abundance and biomass for the studied reservoirs was 75.9 thousand copies/m³ and 574.61 mg/m³, respectively. According to the average indicators of zooplankton biomass, floodplain lakes are characterized as ultra-oligotrophic reservoirs of the lowest productivity class. Zoobenthos community of floodplain lakes in the middle reaches of the river the Irtysh of the Omsk region, during the research period, is represented by 25 taxa belonging to three classes of organisms: insects( Insecta), leeches (Hirudinea) and small-scale worms (Oligochaeta). The larvae of chironomids (Sigopominae), mayflies (Ephemeroptera) and small-scale worms (Oligochaeta) formed the basis of the abundance and biomass. The average number of zoobenthos in floodplain lakes of the Omsk region during the study period was 465 specimens/m². The average biomass was 1.519 g/m². According to the average indicators of the biomass of the zoobenthos community, the floodplain lakes of the Omsk region belong to low-feed reservoirs, according to the trophic status — to the oligotrophic type of the low class.

scholarly journals Species diversity of freshwater fish and assessment on watershed health in the Irtysh River and Ulungur River basins in Xinjiang, China

2020 ◽  
Vol 28 (4) ◽  
pp. 422-434
Author(s):  
Xuejian Li ◽  
Peiyao Jia ◽  
Chengyi Niu ◽  
Yingchun Xing ◽  
Haolin Li ◽  
...  
Keyword(s):  
Species Diversity ◽  
Freshwater Fish ◽  
River Basins ◽  
Irtysh River ◽  
Watershed Health ◽  
The Irtysh River

Features of the formation of zooplankton of the upper Ob in the conditions of the influence of the megapolis

2021 ◽  
pp. 21-31
Author(s):  
Lyubov Semyonovna Vizer ◽  
Alexander Mikhailovich Vizer ◽  
Iuliia Vital’evna Tsygankova Iuliia Vital’evna Tsygankova ◽  
Andrey Valeryevich Tsapenkov
Keyword(s):  
Species Diversity ◽  
Zooplankton Community ◽  
Organic Pollution ◽  
Zooplankton Biomass ◽  
Organic Contamination ◽  
Saprobity Index ◽  
Ob River ◽  
Annual Biomass ◽  
Quantitative Indicators ◽  
The City

Journal: Рыбоводство и рыбное хозяйство №8 2021, №8, 2021 Based on the data obtained in the study of some hydrobiological sections of the Ob River, located above and below the city. The qualitative and quantitative characteristics of the zooplankton community were considered, and the saprobity index was calculated. The species composition is represented by 34 species from three systematic groups, of which 12 are rotifers (Rotifera), 14 are branchial crustaceans (Cladocera), and 10 are copepods (Copepoda). The highest species diversity was observed above the city — 34 taxa, the lowest below the city — 14. The average number of zooplankton above the city of Novosibirsk is insignificant and reached 761 copies/m³ per year. Most (49%) were copepods (Copepoda). The number of rotifers (Rotifera) was 34% of the total. In the summer, the number of zooplankton was slightly higher than the annual one and amounted to 871 copies/m³. The average annual biomass of zooplankton had low values and was 35.0 mg/m³. The maximum summer values reached 180 mg/m³. In the study area of the Ob River below Novosibirsk, the average number of zooplankton increases to 2,4 thousand copies/m³. The group of oar-footed crustaceans dominated in number, its share reached 91%. The number of branchiform crustaceans was 7%. The average annual zooplankton biomass in the river below the city limits was 99.53 mg/m³. The value of the saprobity index in the area above Novosibirsk was 1.6, which indicates the presence of weak organic contamination and corresponds to beta-mesosaprobic conditions. In the zone below Novosibirsk, the saprobity index was 2.0, which indicates an increase in organic pollution and corresponds to beta-mesosaprobic conditions. An increase in the level of eutrophication contributes to a change in the structure of zooplankton. This is reflected in a significant decrease (2.4 times) in the species diversity of zooplankton and a significant increase in quantitative indicators: abundance — 3.2 times, biomass — 2.8 times.

scholarly journals Carbon stocks of homestead forests have a mitigation potential to climate change in Bangladesh

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tarit Kumar Baul ◽  
Tajkera Akhter Peuly ◽  
Rajasree Nandi ◽  
Lars Holger Schmidt ◽  
Shyamal Karmakar
Keyword(s):  
Species Diversity ◽  
Stand Structure ◽  
Diversity Index ◽  
Carbon Stocks ◽  
Small Scale ◽  
Species Diversity Index ◽  
C Stocks ◽  
Homestead Forests ◽  
C Stock ◽  
Low Altitude

AbstractA total of 176 homestead forests at three altitudes in the Chittagong Hill Tracts, Bangladesh were randomly surveyed to estimate carbon (C) stocks and how stand structure affects the biomass C. All woody vegetations were measured, and litter and soil (0–30 cm depth) were sampled. The tree biomass C stock in the top two altitude forests was up to 37–48% higher than in low altitude, owing to significantly higher tree density and species diversity. An increase in species diversity index by one unit increased the biomass stock by 23 Mg C ha−1. The C stock of litterfall in low altitude forests was 22–28% higher than in the top two altitude due to the deposition of litters downslope and deliberate use of mulch for soil improvement and conservation, resulting in up to 5% higher total soil C. The topsoil C was 10–25% higher than the deeper soil, depending on the altitude. The forest stored 89 Mg C ha−1, indicating a potential for C sequestration in trees outside forest. This study would help policymakers to strengthen the recognition of small-scale forests for mitigation in REDD + (reducing emissions from deforestation and forest degradation, the role of conservation, sustainable management of forests, and enhancement of forest carbon stocks) and support owners through C credits from sustainably managed forests.

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.

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