Features of quantitative distribution of fish in the Don River delta during warm season 2015

Species diversity and population dynamics of small non-target fish in hydrological and hydro-chemical restructuring of the Don River delta were studied. River delta is the boundary of a large estuarine ecotone between the ecosystems of the Azov Sea and the river basin. Low values of the Shannon index of diversity were recordered for fish communities. This confirms the dominance of short-cycle eurybiontic weed fish. The increase of the abundance of the Ponto-Caspian endemic species can result from father growth of salinity of the Azov Sea.

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Ice regime in the early 21st century according to observations in the Don River delta

Studies of the Southern Scientific Centre of Russian Academy of Sciences ◽

10.23885/1993-6621-2020-8-41-49 ◽

2020 ◽

Vol 8 ◽

pp. 41-49

Author(s):

L.V. Dashkevich ◽

Keyword(s):

River Delta ◽

Don River ◽

Ice Regime

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MONITORING RESULTS OF SAZAN (CYPRINUS CARPIO CARPIO LINNAEUS, 1758) POPULATION IN THE EASTERN PART OF THE TAGANROG BAY AND THE DON RIVER DELTA

STATE AND DEVELOPMENT PROSPECTS OF AGRIBUSINESS. In the frame of the XXIII Agribusiness Forum of the South of Russia and the Exhibition «Interagromash» Volume 1 ◽

10.23947/interagro.2020.1.364-368 ◽

2020 ◽

Author(s):

P.A. Balykin ◽

◽

A.V. Startsev ◽

G.E. Guskov ◽

A.S. Grin ◽

...

Keyword(s):

Age Groups ◽

Indirect Evidence ◽

Parasite Fauna ◽

River Delta ◽

Weight Growth ◽

Younger Age ◽

Cyprinus Carpio Carpio ◽

Don River ◽

Taganrog Bay ◽

Biological State

The materials for 2003-2018 on the biological state of sazan of the eastern part of the Taganrog Bay and the Don River delta were summarized. It has been shown that the catches of sazan in the study area consisted of more than half of the fish of younger age groups, the length of which was less than the commercial measure. The ratio of linear and weight growth of sazan is shifting towards a decrease in the mass of one-dimensional specimen, which is indirect evidence of the deterioration of the natural living conditions of semi-migratory fish. In 2019, the carp parasite fauna was represented by 7 species related to monogenes - 2 species, cestodes - 3 species, nematodes - 1 species, crustaceans - 1. The state of the sazan population needs further research.

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

Environment Technology Resources Proceedings of the International Scientific and Practical Conference ◽

10.17770/etr2017vol1.2650 ◽

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.

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Radiocarbon chronology of Neolithic in the Lower Don and North-eastern Azov Sea

Documenta Praehistorica ◽

10.4312/dp.13 ◽

2018 ◽

Vol 44 ◽

pp. 204

Author(s):

Andrey Tsybryi ◽

Viktor Tsybryi ◽

Ekaterina Dolbunova ◽

Andrey Mazurkevich ◽

Marianna Kulkova

Keyword(s):

The North ◽

Azov Sea ◽

North Eastern ◽

Don River ◽

Southern Russia ◽

New Perspective ◽

Radiocarbon Chronology

So far, four different cultural-chronological groups of sites have been identified in the North-eastern Azov Sea and Lower Don River areas, including sites of the Rakushechny Yar culture, Matveev Kurgan culture, Donets culture, and sites of the Caspian-Ciscaucasian region. An analysis of all known dates, as well as the contexts and stratigraphies of the sites, allowed us to form a new perspective of the chronology of southern Russia, to revise the chronology of this region, and change the concept of unreliability of dates for this area.

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Laboratory study on the effects of nutrient enrichment on a phytoplankton population in Sawa Lake, Iraq

Baghdad Science Journal ◽

10.21123/bsj.5.2.230-236 ◽

2008 ◽

Vol 5 (2) ◽

pp. 230-236 ◽

Cited By ~ 1

Author(s):

Baghdad Science Journal

Keyword(s):

Population Dynamics ◽

Lake Water ◽

Nutrient Enrichment ◽

Cell Number ◽

Shannon Index ◽

Nitrogen And Phosphorus ◽

Phytoplankton Population ◽

Phytoplankton Cell ◽

Nitrogen Phosphorus ◽

Index Of Diversity

Nutrient enrichment of Sawa lake water was made using different nitrogen and phosphorus concentrations during autumn and spring at three stations. Different concentrations of nitrogen, phosphorus and N: P ratios were used to test variations in phytoplankton population dynamics. Nitrogen at a concentration of 25 µmole.l-1 and N: P ratio of 10:1 gave highest phytoplankton cell number at all stations and seasons. A total of 64 algal taxa dominated by Bacillariophyceae followed by Cyanophyceae and Chlorophyceae were identified. The values of Shannon index of diversity were more than one in the studied stations.

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Geoheritage in Deltaic Environments: Classification Notes, Case Example, and Geopark Implication

Environments ◽

10.3390/environments6020018 ◽

2019 ◽

Vol 6 (2) ◽

pp. 18 ◽

Cited By ~ 6

Author(s):

Anna Mikhailenko ◽

Dmitry Ruban

Keyword(s):

River Delta ◽

Anthropogenic Sources ◽

Full Spectrum ◽

River Deltas ◽

Geological Features ◽

Don River ◽

The Rich ◽

Ecosystem Interactions ◽

Geological Phenomenon

River deltas boast ecosystem richness, but their efficient conservation and management require consideration of the full spectrum of natural phenomena, including those which are geological. Few specialists have explored the issue of deltaic geological heritage (geoheritage), and the relevant knowledge remains scarce and non-systematised. This paper proposes the first classification of this geoheritage. Five categories are distinguished: entire-delta geological phenomenon, delta-associated “purely” geological features, delta-associated features resulting from geology–ecosystem interactions, geological features occasional to deltas, and geoarchaeological localities in deltas. Chosen as a case example, the Don River delta in the southwestern part of Russia possesses geoheritage of these categories, except for the latter. The relevant unique geological features differ by their types and ranks. Of particular interest is the phenomenon of a self-cleaning environment which prevents mercury concentration in the soil despite pollution from natural and anthropogenic sources. The complexity of the deltaic geoheritage, its co-existence with the rich biodiversity, and the aesthetical issues make geopark creation in river deltas a sensible venture. Relevant proposals have been made for Malaysia and the Netherlands–Belgium border, and the Don River delta in Russia also presents an appropriate location for geopark creation.

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