Estimating the Biodiversity Level of the Pechora River Delta Freshwater Ecosystems by the Structure of Bottom Communities of Cladocera, Copepoda, and Oligoсhaeta

2021 ◽  
Vol 14 (6) ◽  
pp. 709-721
Author(s):  
M. A. Baturina ◽  
E. B. Fefilova
Keyword(s):  
Freshwater Ecosystems ◽  
River Delta ◽  
Bottom Communities ◽  
Pechora River ◽  
Structure Of Bottom Communities

scholarly journals ASSESSMENT OF ECOLOGICAL STATE OF THE VELIKAYA RIVER DELTA BASED ON HYDROCHEMICAL INDICATORS AND STRUCTURE OF PHYTOPLANKTON

2017 ◽  
Vol 1 ◽  
pp. 82
Author(s):  
Tatiana Drozdenko ◽  
Sergei Mikhalap ◽  
Larisa Nikolskaya ◽  
Anna Chernova
Keyword(s):  
Water Quality ◽  
High Speed ◽  
Shannon Index ◽  
Freshwater Ecosystems ◽  
River Delta ◽  
Ecosystem Dynamics ◽  
Polluted Water ◽  
Ecological State ◽  
Sample Collection ◽  
Wide Range

The basis of the existence of freshwater ecosystems is phytoplankton, which produces most of the primary biological production, participates in repair processes and provides a wide range of ecosystem services. The short life cycle and high speed metabolism of microalgae make them ideal objects for ecological monitoring. The aim of the present study is to research the ecological state of the Velikaya river delta based on the species composition of phytoplankton community and some hydrochemical parameters. The sample collection for phytoplankton study and physicochemical measurements was carried out in summer 2016 at five stations representing different ecological locations of the Velikaya river delta. One hundred sixty five species taxa of microalgae belonging to 8 phylums were identified during the research: Bacillariophyta (37%), Chlorophyta (33.9%), Cyanophyta/Cyanobacteria (9.7%), Chrysophyta (6.1%), Euglenophyta (6.1%), Cryptophyta (3%), Dinophyta (3%), Xanthophyta (1.2%). The values of Shannon index indicate the average complexity of the microalgae communities structure. Values of Margalef index characterize the Velikaya river delta as an area of high species richness. Compared to the previous studies, a significant increase in the level of information diversity is observed, indicating an increase in the number of possible flows of substance and energy in the ecosystem. Dynamics of biogen substances in the water shows a slight increase of their concentrations. Ecological and geographical analysis proves that absolute dominance of cosmopolitan freshwater forms is typical for the algoflora of the Velikaya river delta. In relation to the pH-reaction inhabitants of neutral and slightly alkaline water dominate. Pantle–Buck saprobity index is applied for water quality assessment, which shows beta-mesosaprobic water quality in the ecosystem. Thus, the water of the Velikaya river delta could be referred to the category of moderately polluted water (class II of water quality). This is confirmed by the data of hydrochemical analysis.

scholarly journals Recent Сladocera (Branchiopoda, Crustacea) in the Taphocenoses of Lakes in the Pechora River Delta (Russia)

2021 ◽  
Vol 163 (3) ◽  
pp. 527-537
Author(s):  
N.M. Nigmatullin ◽  
◽  
G.R. Nigamatzyanova ◽  
E.A. Valieva ◽  
L.A. Frolova ◽  
...  
Keyword(s):  
River Delta ◽  
Pechora River

scholarly journals Using Ground Penetrating Radar for Permafrost Monitoring from 2015–2017 at CALM Sites in the Pechora River Delta

2021 ◽  
Vol 13 (16) ◽  
pp. 3271
Author(s):  
Maria Sudakova ◽  
Marat Sadurtdinov ◽  
Andrei Skvortsov ◽  
Andrei Tsarev ◽  
Galina Malkova ◽  
...  
Keyword(s):  
Water Content ◽  
Active Layer ◽  
Ground Penetrating Radar ◽  
Thermal State ◽  
River Delta ◽  
Permafrost Degradation ◽  
Sandy Ground ◽  
Permafrost Table ◽  
Pechora River ◽  
Ground Penetrating

This paper describes the results of ground penetrating radar (GPR) research combined with geocryological data collected from the Circumpolar Active Layer Monitoring (CALM) testing sites in Kashin and Kumzha in August 2015, 2016, and 2017. The study area was located on the Pechora River delta. Both sites were composed of sandy ground and the permafrost depth at the different sites ranged from 20 cm to 8–9 m. The combination of optimum offset and multifold GPR methods showed promising results in these investigations of sandy permafrost geological profiles. According to direct and indirect observations after the abnormally warm conditions in 2016, the thickness and water content of the active layer in 2017 almost returned to the values in 2015 in the Kashin area. In contrast, the lowering of the permafrost table continued at Kumzha, and lenses of thin frozen rocks that were observed in the thawed layer in August of 2015 and 2017 were absent in 2016. According to recent geocryological and geophysical observations, increasing permafrost degradation might be occurring in the Pechora River delta due to the instability of the thermal state of the permafrost.

scholarly journals THE MODERN STATUS OF THE VELIKAYA RIVER DELTA ON THE STATE OF PRIMARY PRODUCERS

2019 ◽  
Vol 1 ◽  
pp. 48
Author(s):  
Tatiana Drozdenko ◽  
Sergei Mikhalap ◽  
Kristina Mikhaylova ◽  
Anna Chernova
Keyword(s):  
Water Quality ◽  
Natural Waters ◽  
Ecological Status ◽  
Water Quality Assessment ◽  
Water Area ◽  
Freshwater Ecosystems ◽  
The State ◽  
River Delta ◽  
Primary Producers ◽  
Weakly Alkaline

Primary producers are an integral part of freshwater ecosystems. Phytoplankton forms the basis of the trophic pyramid, participates in the formation of water quality and acts as a sensitive indicator of the state of the reservoir. The ability of macrophytes to accumulate mineral and organic substances makes them active participants in the self-purification of natural waters. Higher aquatic plants are characterized by conservatism to short-term changes in the environment, but changes in vegetation over the years may indicate anthropogenic transformation of ecosystems. The contribution to maintaining the stability of the functioning and biodiversity of the ecosystem makes phytoplankton and macrophytes compulsory research objects aimed at studying the state of water bodies. The aim of the work was the study of primary producers as bioindicators of the ecological status of the Velikaya river delta in the summer of 2018. As a result, 127 phytoplankton taxa from 8 phylums were found: Chlorophyta, Bacillariophyta, Cyanobacteria, Euglenophyta, Chrysophyta, Dinophyta, Cryptophyta, Charophyta. The species richness was dominated by the Chlorophyta (42.5%), Bacillariophyta (25.2%), Cyanobacteria (11.1%). According to the ecological and geographical analysis of the delta algaflora, cosmopolitan, freshwater, planktonic forms of microalgae dominate, preferring neutral and weakly alkaline waters. Water quality assessment revealed the beta-mesosaprobic nature of the waters, which indicates moderate pollution of the water area. In the composition of macrophytes, 43 species from 3 phylums were identified: Magnoliophyta, Equisetophyta, Chlorophyta. By species composition, angiosperms dominated (95.3%), of which 46.3% were dicotyledons and 53.7% - monocotyledons. Hygrophytes (34.9%) and hydrophytes (32.6%) prevailed in terms of ecological structure. The leading role in the overgrowing of the delta belonged to high-grass helophytes and rooting hydrophytes with leaves floating on the water. A total of 37 saprobiont flora were found. The total index of saprobity was 277 points.

Diversity of Planktonic Fauna of the Pechora River Delta

2019 ◽  
Vol 12 (3) ◽  
pp. 254-264
Author(s):  
E. B. Fefilova ◽  
O. N. Kononova
Keyword(s):  
River Delta ◽  
Pechora River
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