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.

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 The state of zooplankton communities in the lower Dniester area under the conditions of river regulation and actual climatic changes

2021 ◽  
Author(s):  
Liubovi Lebedenco ◽  
◽  
Mykhailo Nabokyn ◽  
Nadejda Andreev ◽  
Svetlana Kovalyshyna ◽  
...  
Keyword(s):  
Zooplankton Community ◽  
River Regulation ◽  
Zooplankton Biomass ◽  
Individual Characteristics ◽  
The State ◽  
Current State ◽  
Zooplankton Communities ◽  
Physical And Chemical ◽  
Quantitative Indicators ◽  
Planktonic Communities

The study focuses on zooplankton communities of the Lower Dniester. The quantitative indicators of plankton are given and the annual dynamics is described. An assessment of the current state of the river according to the state of zooplankton communities is presented, together with a comparison with historical data, at different stages of river regulation. The changes that occurred in the river zooplankton since the 1950s were analyzed. The relationships between individual characteristics of planktonic communities and the physical and chemical characteristics of the river was also investigated. A comparison of actual data with those collected during 70-80s revealed no significant changes in the structure of the zooplankton community. The proportion of different groups of zooplankton organisms changed insignificantly, the saprobity indices improved slightly, and the average zooplankton biomass did not change. However, compared to the period before 1950s, prior to river regulation for hydropower purposes the role of rotifers in the community was reduced. It might be difficult to identify the main factor determining the development of zooplankton in the Lower Dniester, in order to understand the processes taking place in planktonic communities, it is necessary to analyze the complex impact of hydrological and hydrochemical factors on planktonic communities.

The influence of submesoscale eddies on hydrochemical parameters and structural and functional characteristics of phytoplankton in the north-eastern part of the Black Sea

2019 ◽  
pp. 24-40
Author(s):  
Sergey B. Kuklev ◽  
Vladimir A. Silkin ◽  
Valeriy K. Chasovnikov ◽  
Andrey G. Zatsepin ◽  
Larisa A. Pautova ◽  
...  
Keyword(s):  
Anticyclonic Eddy ◽  
The Black Sea ◽  
Hydrochemical Parameters ◽  
North East ◽  
The North ◽  
Seasonal Thermocline ◽  
North Eastern ◽  
Quantitative Indicators ◽  
The City ◽  
North Eastern Part

On June 7, 2018, a sub-mesoscale anticyclonic eddy induced by the wind (north-east) was registered on the shelf in the area of the city of Gelendzhik. With the help of field multidisciplinary expedition ship surveys, it was shown that this eddy exists in the layer above the seasonal thermocline. At the periphery of the eddy weak variability of hydrochemical parameters and quantitative indicators of phytoplankton were recorded. The result of the formation of such eddy structure was a shift in the structure of phytoplankton – the annual observed coccolithophores bloom was not registered.

PROBLEMS OF STRAY ANIMALS IN NOVOSIBIRSK

2020 ◽  
Vol 4 (2) ◽  
pp. 85-91
Author(s):  
Elena E. Rinchinova ◽  
Diyara A. Takumova ◽  
Irina I. Bochkareva
Keyword(s):  
Urban Population ◽  
Domestic Animals ◽  
Legal Documents ◽  
Quantitative Indicators ◽  
The City

The article discusses main issues of organizing activities for the treatment of stray and street animals in the city of Novosibirsk. The important role of successful solving the problem of stray animals in ensuring environmental comfort and safety of the urban population is noted. Definitions of the concepts “stray animals” and “street animals” are given, the differences between them are emphasized. The main regulatory and legal documents governing the handling of stray and street animals are listed. The ways in which domestic animals get into a stray state are described briefly. The results of the collection and analysis of information on the activities of shelters for stray animals in Novosibirsk are described. The information on the quantitative indicators of the shelters are given. Conclusions on how to solve the problem of stray animals, relying on the latest regulations are drawn.

scholarly journals Diversity and Community Structure of Oribatid Mites (Acari, Oribatei) at Memorial Complexes of a Megapolis

2013 ◽  
Vol 47 (4) ◽  
pp. 291-297
Author(s):  
L. A. Kolodochka ◽  
O. S. Shevchenko
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Species Complex ◽  
Common Species ◽  
Oribatid Mites ◽  
Direct Relation ◽  
City Center ◽  
Degree Of Dominance ◽  
Different Types ◽  
The City

Abstract In different types of substrate (soil, litter, lichens and mosses) collected at three memorial complexes (cemeteries) of Kyiv (Ukraine), 70 species from 57 genera, 34 families of oribatid mites were found. A few eurytopic species capable of tolerance to different types of pollution make up an essential part in each species complex. The species diversity and complexity of oribatid community structure at researched areas increased with distance from the city center. There was no direct relation between the degree of dominance of most common species and the cemetery’s relative remoteness from the center of the city.

Implications of a regional-scale process (the Lakshadweep low) on the mesozooplankton community structure of the Arabian Sea

2019 ◽  
Vol 70 (3) ◽  
pp. 345 ◽  
Author(s):  
K. K. Karati ◽  
G. Vineetha ◽  
T. V. Raveendran ◽  
P. K. Dineshkumar ◽  
K. R. Muraleedharan ◽  
...  
Keyword(s):  
Physical Process ◽  
Arabian Sea ◽  
Mixed Layer Depth ◽  
Regional Scale ◽  
Zooplankton Community ◽  
Ocean Basin ◽  
Zooplankton Biomass ◽  
Global Ocean ◽  
Mesozooplankton Community ◽  
Tropical Ocean

The Arabian Sea, a major tropical ocean basin in the northern Indian Ocean, is one of the most productive regions in the global ocean. Although the classical Arabian Sea ‘paradox’ describes the geographical and seasonal invariability in zooplankton biomass in this region, the effect of the Lakshadweep low (LL), a regional-scale physical process, on the zooplankton community has not yet been evaluated. The LL, characterised by low sea surface height and originating around the vicinity of the Lakshadweep islands during the mid-summer monsoon, is unique to the Arabian Sea. The present study investigated the effect of the LL on the zooplankton community. The LL clearly had a positive effect, with enhanced biomass and abundance in the mixed-layer depth of the LL region. Copepods and chaetognaths formed the dominant taxa, exhibiting strong affinity towards the physical process. Of the 67 copepod species observed, small copepods belonging to the families Paracalanidae, Clausocalanidae, Calanidae, Oncaeidae and Corycaeidae dominated the LL region. Phytoplankton biomass (chlorophyll-a) was the primary determinant influencing the higher preponderance of the copepod community in this region.

scholarly journals Methodology for Assessing the Transport Accessibility of Capital Objects in a Megacity Based on Geoinformation Data

2022 ◽  
Vol 12 (4) ◽  
pp. 400-415
Author(s):  
S. V. Mkhitaryan ◽  
Zh. B. Musatova ◽  
T. V. Murtuzalieva ◽  
G. S. Timokhina ◽  
I. P. Shirochenskaya
Keyword(s):  
Transport Infrastructure ◽  
Future Research ◽  
Infrastructure Development ◽  
Test Results ◽  
Transport Accessibility ◽  
Methodological Approaches ◽  
Secondary Information ◽  
Quantitative Indicators ◽  
The City ◽  
Housing Estates

Purpose: to present the author's methodology and the test results for calculating integral indicators of transport accessibility on the basis of weighted normalized private indicators for three housing estates in Moscow.Methods: the study is based on the application of methods for collecting factual material, its processing, systematic, comparative historical and structural-functional analysis, which were supplemented by multivariate analysis of secondary information using content analysis of existing methods for calculating indicators of transport accessibility of capital objects. The results and conclusions of the research are based on the use of the author's methodology for calculating integral indicators of transport accessibility based on weighted normalized private indicators for three housing estates in Moscow. The analysis of a possible set of criteria for assessing transport accessibility of housing estates in Moscow metropolis was carried out on the basis of the use of a geographic information system database GIS NextGIS QGIS.Results: a review of methodological approaches to the calculation of objective quantitative indicators characterizing the transport accessibility of capital objects is carried out; the author's methodology for calculating the integral indicators of the transport accessibility of residential complexes in Moscow is presented and tested on the basis of weighted normalized private criteria / indicators. The use of the authors’ methodology for calculating integral indicators of transport accessibility based on weighted normalized private criteria / indicators made it possible to calculate the values of indicators of transport accessibility for three housing estates in Moscow, calculate an integrated score for a set of transport accessibility criteria for each housing estate, to give a comparative quantitative assessment of their transport accessibility, to conduct a rating of housing estates in terms of their transport accessibility.Conclusions and Relevance: the presented results of approbation of the author's methodology for calculating the integral indicators of transport accessibility for housing estates in Moscow allow to conduct a comparative and dynamic analysis of housing estates (or larger units) transport accessibility. The results of such an analysis can be applied in order to develop programs for transport infrastructure development of the megacity as a whole, its certain districts and city parts, as well as to assess such programs efciency. The authors see the directions for future research in the defnition and calculation of indicators based on the city dwellers perception of the transport accessibility

scholarly journals Assessment of watercourses of Astrakhan by hydrobiological and microbiological indicators

2019 ◽  
Vol 2019 (4) ◽  
pp. 24-31
Author(s):  
Valentina Korolevskaya ◽  
Olga Soprunova ◽  
Alina Galperina ◽  
Alina Bareeva
Keyword(s):  
Water Quality ◽  
Urban Areas ◽  
Pure Water ◽  
Total Content ◽  
Organic Pollution ◽  
Coliform Bacteria ◽  
Waste Products ◽  
Saprobity Index ◽  
Station Location ◽  
Microbiological Indicators

The paper focuses upon the control over environmental pollution of water bodies by human waste products in urban areas, which can be carried out by monitoring hydrobiological indi-cators. In the course of study undertaken in May 2017 and 2018 there was assessed the ecological and sanitary status of the Volga and Kutum rivers that flow on the territory of Astrakhan. Samples were taken at four stations; the choice of station location was determined by the presence of pollutant sources: proximity of the city market or the power plant. Quantitative and qualitative indicators of the state of phytoplankton were used as hydrobiological indicators; the total number of bacteria and the total content of coliform bacteria were evaluated as microbiological indicators. During the study period the ecological and sanitary state of water was rated as satisfactory. The number of algae taxa increased insignificantly (by 3 units), diatoms predominated in the number of genera and number. Despite the presence of 4-5 species of pure water representatives in the investigated waters, the sanitary and bacteriological situation at all the studied stations was found unfavorable; the water was characterized as polluted and dirty. In 2018, there was registered deterioration of water quality compared to 2017, while the calculated saprobity index in the Kutum river indicates the water quality improvement downstream. The increasing value of the water saprobity index in the Kutum river indicates a tendency toward the growing level of organic pollution and necessitates a comprehensive analysis of hydrobiological indicators for systematic monitoring the aquatic environment.

scholarly journals Contribution and pathways of diazotroph-derived nitrogen to zooplankton during the VAHINE mesocosm experiment in the oligotrophic New Caledonia lagoon

2016 ◽  
Vol 13 (10) ◽  
pp. 3131-3145 ◽  
Author(s):  
Brian P. V. Hunt ◽  
Sophie Bonnet ◽  
Hugo Berthelot ◽  
Brandon J. Conroy ◽  
Rachel A. Foster ◽  
...  
Keyword(s):  
N2 Fixation ◽  
New Caledonia ◽  
Austral Summer ◽  
Zooplankton Community ◽  
Zooplankton Biomass ◽  
Diazotrophic Cyanobacteria ◽  
Subtropical Oceans ◽  
Isotope Mixing Models

Abstract. In oligotrophic tropical and subtropical oceans, where strong stratification can limit the replenishment of surface nitrate, dinitrogen (N2) fixation by diazotrophs can represent a significant source of nitrogen (N) for primary production. The VAHINE (VAriability of vertical and tropHIc transfer of fixed N2 in the south-wEst Pacific) experiment was designed to examine the fate of diazotroph-derived nitrogen (DDN) in such ecosystems. In austral summer 2013, three large ( ∼  50 m3) in situ mesocosms were deployed for 23 days in the New Caledonia lagoon, an ecosystem that typifies the low-nutrient, low-chlorophyll environment, to stimulate diazotroph production. The zooplankton component of the study aimed to measure the incorporation of DDN into zooplankton biomass, and assess the role of direct diazotroph grazing by zooplankton as a DDN uptake pathway. Inside the mesocosms, the diatom–diazotroph association (DDA) het-1 predominated during days 5–15 while the unicellular diazotrophic cyanobacteria UCYN-C predominated during days 15–23. A Trichodesmium bloom was observed in the lagoon (outside the mesocosms) towards the end of the experiment. The zooplankton community was dominated by copepods (63 % of total abundance) for the duration of the experiment. Using two-source N isotope mixing models we estimated a mean  ∼  28 % contribution of DDN to zooplankton nitrogen biomass at the start of the experiment, indicating that the natural summer peak of N2 fixation in the lagoon was already contributing significantly to the zooplankton. Stimulation of N2 fixation in the mesocosms corresponded with a generally low-level enhancement of DDN contribution to zooplankton nitrogen biomass, but with a peak of  ∼  73 % in mesocosm 1 following the UCYN-C bloom. qPCR analysis targeting four of the common diazotroph groups present in the mesocosms (Trichodesmium, het-1, het-2, UCYN-C) demonstrated that all four were ingested by copepod grazers, and that their abundance in copepod stomachs generally corresponded with their in situ abundance. 15N2 labelled grazing experiments therefore provided evidence for direct ingestion and assimilation of UCYN-C-derived N by the zooplankton, but not for het-1 and Trichodesmium, supporting an important role of secondary pathways of DDN to the zooplankton for the latter groups, i.e. DDN contributions to the dissolved N pool and uptake by nondiazotrophs. This study appears to provide the first evidence of direct UCYN-C grazing by zooplankton, and indicates that UCYN-C-derived N contributes significantly to the zooplankton food web in the New Caledonia lagoon through a combination of direct grazing and secondary pathways.

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