scholarly journals CONTENT OF THE DISSOLVED OXYGEN IN THE SEA OF AZOV DURING THE AUTUMN AND WINTER PERIOD IN 2015

2017 ◽  
Vol 13 (1) ◽  
pp. 126-130
Author(s):  
V.S. Gerasyuk ◽  
Keyword(s):  
Dissolved Oxygen ◽  
Winter Period ◽  
Sea Of Azov ◽  
The Sea Of Azov ◽  
Autumn And Winter

scholarly journals Fast ice dynamics of the sea of Azov in the XXI centure

2021 ◽  
Vol 27 (3) ◽  
pp. 74-84
Author(s):  
Anastasiia Magaeva ◽  
Natalia Yaitskaya
Keyword(s):  
Winter Period ◽  
Spatial And Temporal Variability ◽  
Northern Coast ◽  
Sea Of Azov ◽  
Ice Dynamics ◽  
The Sea Of Azov ◽  
Air Temperatures ◽  
Fast Ice ◽  
Taganrog Bay

The article is dedicated to the investigation of the fast ice dynamics for the period 2000–2020 according to satellite data and field observations using GIS technologies. We used data from International Data Center – Sea Ice and coastal observation points to analyze long-term changes. Data processing and analysis was carried out using the ArcGIS 10.4 software package. As a result, data were obtained on the spatial and temporal variability of fast ice in the Sea of Azov for the 2000–2020. The area and width of fast ice, the periods of formation, destruction and duration were analyzed. The maps of the fast ice formation frequency were constructed for each month of the winter period: December–March. It is shown that the duration of fast ice on all coastal observation points decreased: for points on the northern coast Taganrog and Mariupol—by 3–5 days, for points on the southern coast of Taganrog Bay—Yeisk and Dolzhanskaya—by 10–12 days, for point Genichesk—7 days. Average long-term fast ice area for 2000–2020 is 1800 km2. But against the background of an increase in winter air temperatures, the fast ice area is decreasing, and in the last winter periods it is not observed. The width of the fast ice at the northern coast of the Sea of Azov and the Taganrog Bay is 5–10 km. In the western and southeastern parts of the sea (sections Temryuk, Arabatskaya and Obitochny), the fast ice width is 2–5 km on average over the winter and was observed in 25 % of cases.

scholarly journals Role of abiotic and biotic factors in formation of the seasonal variability of bioluminescence fields in the Sea of Azov

2018 ◽  
Vol 3 (2) ◽  
pp. 64-72
Author(s):  
A. V. Melnik ◽  
Yu. N. Tokarev ◽  
Iu. B. Belogurova ◽  
E. Iu. Georgieva ◽  
V. F. Zhuk ◽  
...  
Keyword(s):  
Species Composition ◽  
Water Temperature ◽  
Seasonal Variability ◽  
Field Measurements ◽  
Bottom Layer ◽  
Winter Period ◽  
Sea Of Azov ◽  
Average Water Temperature ◽  
Bioluminescence Intensity ◽  
The Sea Of Azov

More than 150 intensity profiles of the bioluminescence field at 4 hydrographic stations were obtained for the first time in the Sea of Azov. The profiles were performed with a discreteness of 1 m in depth, as well as temperature and electrical conductivity profiles; microplankton species composition was also analyzed. Measurements of vertical profiles of the photosynthetically active radiation were also made during daytime. Almost at all the stations, along with the bioluminescence field measurements, samples of microplankton were taken by Jedi nets and bathometers for subsequent analysis of its species composition and quantitative distribution. Studies were carried out in winter, spring and summer periods on a unified grid of stations. The pronounced seasonal variability of the bioluminescence field integral values and its vertical structure at the Sea of Azov was registered, that was determined by the superposition of biological and hydrological characteristics of the water column in the study areas. The minimum values of the bioluminescence field intensity at the Sea of Azov (6.05 × 10-12 W·cm-2·l-1 at a depth of 4 m) were recorded in winter period. It was mainly due to low water temperature of 0.5–1.5 °C in the late January and early February, that resulted in low abundance of luminous plankton. With spring warming up of water (at water temperature 12.5 °C) the development of the unicellular plankton intensified and an increase of the bioluminescence intensity in the bottom layer to 34.8 × 10-12 W·cm-2·l-1 was observed. In the summer period, maximum values of the bioluminescence intensity were registered (up to 634.4 × 10-12 W·cm-2·l-1) at average water temperature of 27.5 °C and at maximum abundance and biomass of the luminous phytoplankton fraction.

Morphometric variability in round goby Neogobius melanostomus (Perciformes: Gobiidae) from the Sea of Azov

2017 ◽  
Vol 26 (2) ◽  
pp. 392-405 ◽  
Author(s):  
O.A. Diripasko ◽  
T.A. Zabroda
Keyword(s):  
Round Goby ◽  
Joint Effect ◽  
Neogobius Melanostomus ◽  
Sea Of Azov ◽  
Morphometric Characters ◽  
One Dimensional ◽  
The Sea Of Azov ◽  
Size Dependent ◽  
Size Variability ◽  
Males And Females

A total of 38 morphometric characters of the round goby Neogobius melanostomus melanostomus (Pallas, 1814) were studied in its native range in the Sea of Azov. The aim was to assess joint effect of sexual dimorphism and size variability on overall variability within groups of samples (populations) using appropriate methods of traditional statistical analysis (one-dimensional and multivariate statistics). Sex and size-dependent variability was studied based on model samples of males and females of different size. Most of the studied morphometric characters of round goby from the Sea of Azov demonstrated statistically significant sex- and size-dependent in-group variability. The pattern of the variability suggests that, for a comparison of round goby from different sea regions and between populations, separate samples of males and females within the range 9–13 cm SL should be examined in order to minimise the effect of the size and sex factors. The approach of searching for the most informative size range could be useful not only for further studies of infraspecific variation but for comparisons between morphologically close gobiin species.

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