The state of phytoplankton in the Taganrog Bay and factors determining its development in 2017

2020 ◽  
pp. 69-73
Author(s):  
Lyudmila G. Korneva ◽  
Galina Yu. Glushchenko
Keyword(s):  
Organic Matter ◽  
Seasonal Dynamics ◽  
General Structure ◽  
Taxonomic Composition ◽  
Sea Of Azov ◽  
Don River ◽  
The Stability ◽  
High Level ◽  
Taganrog Bay ◽  
Qualitative Changes

The work presents the results of a study of phytoplankton in Taganrog Bay of the Sea of Azov and the downstream reaches of the Don River (January, April – November 2017). During the study was identified the modern taxonomic composition (210 species of eukaryotic algae and cyanobacteria). Ecological and geographical analysis was showed the stability of the general structure of the plankton algoflora of the studied area compared with previous years of the study (1980s to early 2000s). The work also presents a characteristic of the seasonal dynamics of taxonomic, size structures, and coenotic composition of phytoplankton. During the study was noted the temporary and qualitative changes in composition of phytoplankton, which are indicate a high level of organic matter in the studied reservoirs and an increase in the heterotrophic component in the functioning of the Lower Don ecosystem. It was found that in the studied water bodies the important factor in the formation of composition and the structure of phytoplankton is salinity.

scholarly journals Spiders (Aranei) of the coast of Taganrog Bay (the Sea of Azov) and the Don River delta

2016 ◽  
Vol 12 (1) ◽  
pp. 3-28 ◽  
Author(s):  
A.V. Ponomarev ◽  
◽  
E.V. Prokopenko ◽  
P.P. Ivliev ◽  
V.Yu. Smatko ◽  
...  
Keyword(s):  
River Delta ◽  
Sea Of Azov ◽  
The Sea Of Azov ◽  
Don River ◽  
Taganrog Bay

scholarly journals First find of the Black Sea turbot Scophthalmus maeoticus (Scophthalmidae) in Don River estuary

2018 ◽  
Vol 3 (3) ◽  
pp. 70-76
Author(s):  
D. N. Kutsyn ◽  
A. V. Startsev
Keyword(s):  
River Estuary ◽  
The Black Sea ◽  
Anadromous Fish ◽  
Published Data ◽  
Sea Of Azov ◽  
The Sea Of Azov ◽  
Don River ◽  
Brackish Water Species ◽  
Taganrog Bay ◽  
Water Species

The aim of the work was to describe the first catch of Scophthalmus maeoticus (Pallas, 1814) in the Don River estuary (47°3′57′′N, 39°12′39′′E) and to analyze it in the context of salinity increasing in the Sea of Azov. The study was carried out using two turbot specimens caught on July 16, 2016, and on September 1, 2016, by a net with a mesh 55 mm. Assessment of the chalinic conditions of the Sea of Azov was carried out through annual monitoring at 3 hydrometeorological stations in Don River delta and in the eastern part of the Taganrog Bay. The article presents main meristic and plastic features of the turbots studied in comparison with published data. The dynamics of the salinity in the Sea of Azov and in the Taganrog Bay is analyzed. Find of the turbot in the estuary of the Don River is an evidence of ichthyocene transformation in response to salinity increasing (up to 12.5 ‰ in the Sea of Azov and up to 6 ‰ in the Taganrog Bay). The first catch of the turbot corresponds with trend of increasing of marine and brackish-water species share and with a decrease in the number of native semi-anadromous fish species.

Formation features of phytoplankton of the Bolshaya river (Omsk region) in the zoo's influence zone

2021 ◽  
pp. 131-134
Author(s):  
Olga P. Bazhenova ◽  
Svetlana V. Gontarenko
Keyword(s):  
Seasonal Dynamics ◽  
Trophic Status ◽  
Taxonomic Composition ◽  
Influence Zone ◽  
Dynamics Of Abundance ◽  
Quality Class ◽  
Zone Of Influence ◽  
High Level

According to the results of processing phytoplankton samples taken in 2018–2019 on the Bolshaya River (Omsk Region), the taxonomic composition of phytoplankton, its number and biomass were established in the zone of influence of the Bolsherechensky Zoo. As part of the phytoplankton, 183 species and intraspecific taxa from 8 divisions were identified. Seasonal dynamics of abundance of river phytoplankton and its changes in zone of zoo influence were investigated. In summer, a high level of phytoplankton development and «flowering» of water caused by Aphanizomenon flos-aquae are observed in the river on the territory of the zoo. In the formation of the number and biomass of phytoplankton, a significant share belongs to Chrysophyta and Euglenophyta. The trophic status of the Bolshaya River corresponds to the category of eutrophic waters. In autumn and summer, water in the river corresponds to the 3rd quality class of «satisfactory purity».

The invasion of the genus Marenzelleria (Polychaeta: Spionidae) into the Don River mouth and the Taganrog Bay: morphological and genetic study

2017 ◽  
Vol 97 (5) ◽  
pp. 975-984 ◽  
Author(s):  
Vitaly Syomin ◽  
Andrey Sikorski ◽  
Ralf Bastrop ◽  
Nicole Köhler ◽  
Boris Stradomsky ◽  
...  
Keyword(s):  
Black Sea ◽  
Genetic Study ◽  
Morphological Characteristics ◽  
River Mouth ◽  
The Black Sea ◽  
Morphological Description ◽  
Sea Of Azov ◽  
The Sea Of Azov ◽  
Don River ◽  
Taganrog Bay

Alien polychaetes belonging to the genus Marenzelleria were recorded from the mouth of the Don River and Taganrog Bay in the Sea of Azov in February–March 2014. Morphological characteristics varied greatly and matched those of two species: M. neglecta and M. arctia. Some individuals did not match the descriptions of both species. A genetic study using different sequences (primarily COI, but also 16S, 28S, cytb and nuclear histone 3a) showed that only M. neglecta was present despite some morphological mismatches. A morphological description of the species according to the new data is presented, together with a revised table of variability of the key numeric characters. Since 2014, Marenzelleria has spread swiftly and become dominant in a considerable part of the Taganrog Bay, making up to 91% of the total abundance/biomass (6800 ind. m−2 and 31.2 g m−2, respectively). Monodominant sites were also present. Its occurrence is 100% in recent surveys. Such a sharp increase seems to be due to a lack of detritophages in the bay; this is supported by the fact that M. neglecta has not formed its specific assemblage. The community structure, if M. neglecta is excluded, is equal to that before the invasion. In the Sea of Azov itself, M. neglecta is not as abundant, but occurs up to the Strait of Kertch and at some sites in the Black Sea. Its spread further into the Black Sea seems possible, as well as into the Caspian Sea via the Volga-Don Canal.

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

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.

THE IMPACT OF WIND CONDITIONS ON THE LEVELS OF TOTAL IRON CONTENT IN THE SEA OF AZOV

2017 ◽  
Author(s):  
Yuri Fedorov ◽  
Yuri Fedorov ◽  
Irina Dotsenko ◽  
Irina Dotsenko ◽  
Leonid Dmitrik ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Iron Content ◽  
Iron Concentration ◽  
Total Iron ◽  
Sea Of Azov ◽  
Open Area ◽  
The Sea Of Azov ◽  
Dissolved Iron ◽  
The Impact ◽  
Taganrog Bay

The distribution and behavior of certain of trace elements in sea water is greatly affected by both physical, chemical and hydrometeorological conditions that are showed in the scientific works of prof. Yu.A. Fedorov with coauthors (1999-2015). Due to the shallow waters last factor is one of the dominant, during the different wind situation changes significantly the dynamics of water masses and interaction in the system “water – suspended matter – bottom sediments”.Therefore, the study of the behavior of the total iron in the water of the sea at different wind situation is relevant. The content of dissolved iron forms migration in The Sea of Azov water (open area) varies from 0.017 to 0.21 mg /dm3 (mean 0.053 mg /dm3) and in Taganrog Bay from 0.035 to 0.58 mg /dm3 (mean 0.11 mg /dm3) and it is not depending on weather conditions.The reduction in the overall iron concentration in the direction of the Taganrog Bay → The Sea of Azov (open area) is observed on average more than twice. The dissolved iron content exceeding TLV levels and their frequency of occurrence in the estuary, respectively, were higher compared with The Sea of Azov (open area).There is an increase in the overall iron concentration in the water of the Azov Sea on average 1.5 times during the storm conditions, due to the destruction of the structure of the upper layer and resuspension of bottom sediments, intensifying the transition of iron compounds in the solution.

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