scholarly journals The use of marine microalgae for biotesting the waters of Sevastopol bays

2021 ◽  
pp. 35-42
Author(s):  
L.V. Stelmakh ◽  
◽  
N.P. Kovrigina ◽  
Keyword(s):  
Surface Waters ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
The Black Sea ◽  
Depressing Effect ◽  
Summer Period ◽  
Taxonomic Affiliation ◽  
Multicellular Organisms ◽  
Microalgae Growth

For biotesting the marine environment, multicellular organisms are often used, primarily fish and their embryos. However, microalgae are still not used sufficiently enough for this purpose, the number of tested species is extremely limited. The aim of this work was to study the response of three species of planktonic microalgae to the complex pollution of the Black Sea coastal waters in the Sevastopol region and to assess the possibility of their application for biotesting. The studies were carried out on the diatom Phaeodactylum tricornutum and two dinoflagellates Prorocentrum cordatum and Gyrodinium fissum. To characterize the level of pollution of surface waters with organic substances, two indicators were used: BOС5 (biological oxygen consumption) and permanganate oxidizability. Evaluation of the effect of the water sample pollution on microalgae was carried out by the comparison between the coefficient of increase in the abundance of microalgae cells (Xk) in the experiment and the control one. Laboratory experiments carried out in the summer and autumn periods made it possible to reveal, in most cases, a weak depressing effect of the studied waters pollution on the microalgae growth. Occasionally, this effect reached a chronic level. In the summer period (in June), a stimulating effect of water pollution on the growth of dinoflagellates was observed, reaching the level of subacute level in 50% of cases. The necessity of using several types of microalgae of different taxonomic affiliation when performing biotesting of sea waters is highlighted.

Response of marine microalgae Phaeodactylum tricornutum, Prorocentrum cordatum and Gyrodinium fissum to complex pollution of Sevastopol bays (Black Sea)

2021 ◽  
Vol 48 ◽  
pp. 109-116
Author(s):  
Liudmila Stelmakh ◽  
Nela Kovrigina ◽  
Tatiana Gorbunova
Keyword(s):  
Black Sea ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
Toxicity Assessment ◽  
Marine Microalgae ◽  
The Black Sea ◽  
Organic Substances ◽  
Taxonomic Affiliation ◽  
Concentration Levels

For the degrees of toxicity assessment within the Black Sea surface coastal waters near Sevastopol, laboratory experiments were performed on three marine microalgae species culture’s growth in water sampled on the three stations of the region from May to December 2020. The study has indicated, that in the majority of cases, insignificant inhibiting influences of the waters to diatom Phaeodactylum tricornutum Bohlin and insignificant stimulated effect to dinoflagellates Prorocentrum сordatum (Ostenfeld) J.D.Dodge and Gyrodinium fissum (Levander) Kofoid & Swezy were observed. Rarely this effect was characterized as chronic or subacute. The concentration levels of both stable and unstable forms of organic substances in the studied waters were estimated. The results of the testing of the water to determine its contamination using microalgae and analysis of the organic substances concentration levels in them, allowed the conclusion that the studied area should be classified as episodically polluted. Justification for the necessity to use several microalgae species of different taxonomic affiliation when performing marine water biotesting is provided in this study.

scholarly journals The role of polysaccharides and diatom exudates in the redox cycling of Fe and the photoproduction of hydrogen peroxide in coastal seawaters

2009 ◽  
Vol 6 (4) ◽  
pp. 7789-7819 ◽  
Author(s):  
S. Steigenberger ◽  
P. J. Statham ◽  
C. Völker ◽  
U. Passow
Keyword(s):  
Hydrogen Peroxide ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
Uv Light ◽  
H2o2 Production ◽  
Initial Value ◽  
Photochemical Formation ◽  
Algal Exudates

Abstract. The effect of artificial acidic polysaccharides (PS) and exudates of Phaeodactylum tricornutum on the half-life of Fe(II) in seawater was investigated in laboratory experiments. Strong photochemical hydrogen peroxide (H2O2) production of 5.2 to 10.9 nM (mg C)−1 h−1 was found in the presence of PS and diatom exudates. Furthermore when illuminated with UV light the presence of algal exudates had a net stabilising effect on ferrous iron in seawater (initial value 100 nmol L−1) above that expected from oxidation kinetics. In the dark the PS gum xanthan showed no stabilising effect on Fe(II). The photochemical formation of superoxide (O2−) in presence of diatom exudates and its reducing effect on Fe(III) appears to result in greater than expected concentrations of Fe(II). A model of the photochemical redox cycle of iron incorporating these processes supported the observed data well. Diatom exudates seem to play an important role for the photochemistry of iron in coastal waters.

scholarly journals FUNCTIONAL STATE OF THE MARINE MICROALGAE CULTURES AS AN INDICATOR OF THE WATER POLLUTION LEVEL OF THE SEVASTOPOL BAY

2021 ◽  
pp. 83-90
Author(s):  
L.V. Stelmakh ◽  
◽  
I.M. Mansurova ◽  
Keyword(s):  
Functional State ◽  
Black Sea ◽  
Phaeodactylum Tricornutum ◽  
Inhibitory Effect ◽  
The Black Sea ◽  
Pollution Level ◽  
Sevastopol Bay ◽  
Algae Growth ◽  
Taxonomic Affiliation

The possibility of using cultures of Black Sea planktonic microalgae of different taxonomic affiliation to assess the quality of the aquatic environment based on the assessment of their functional state is shown. The research was carried out on the diatom Phaeodactylum tricornutum, three dinoflagellates species Prorocentrum cordatum, Prorocentrum pusillum and Gyrodinium fissum, as well as the coccolithopho-ride Emiliania huxleyi. It was found that the waters of the Sevastopol Bay in the period from May to August 2021 in 50% of cases had a weak inhibitory effect on the growth of the tested species. In other cases, algae growth was either stimulated or the effect of pollution on cultures was not revealed. The need for using several types of algae in carrying out complex work on water biotesting of the coastal are-as of the Black Sea is highlighted.

scholarly journals The role of polysaccharides and diatom exudates in the redox cycling of Fe and the photoproduction of hydrogen peroxide in coastal seawaters

2010 ◽  
Vol 7 (1) ◽  
pp. 109-119 ◽  
Author(s):  
S. Steigenberger ◽  
P. J. Statham ◽  
C. Völker ◽  
U. Passow
Keyword(s):  
Hydrogen Peroxide ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
Uv Light ◽  
H2o2 Production ◽  
Initial Value ◽  
Photochemical Formation ◽  
Algal Exudates

Abstract. The effect of artificial acidic polysaccharides (PS) and exudates of Phaeodactylum tricornutum on the half-life of Fe(II) in seawater was investigated in laboratory experiments. Strong photochemical hydrogen peroxide (H2O2) production of 5.2 to 10.9 nM (mg C)−1 h−1 was found in the presence of PS and diatom exudates. Furthermore when illuminated with UV light the presence of algal exudates had a net stabilising effect on ferrous iron in seawater (initial value 100 nmol L−1) above that expected from oxidation kinetics. In the dark the PS gum xanthan showed no stabilising effect on Fe(II). The photochemical formation of superoxide (O2−) in the presence of diatom exudates and its reducing effect on Fe(III) appears to result in greater than expected concentrations of Fe(II). A model of the photochemical redox cycle of iron incorporating these processes supported the observed data well. Diatom exudates seem to have the potential to play an important role for the photochemistry of iron in coastal waters.

Condition of the Pelagic Fish Spawn in Coastal Waters of the Black Sea near Sevastopol

2004 ◽  
Vol 40 (3) ◽  
pp. 42-54 ◽  
Author(s):  
A. D. Gordina ◽  
V. G. Tsytsugina ◽  
Ye. I. Ovsyaniy ◽  
A. S. Romanov ◽  
R.B. Kemp
Keyword(s):  
Black Sea ◽  
Coastal Waters ◽  
Pelagic Fish ◽  
The Black Sea ◽  
Fish Spawn

Regularities of Changes of the Bioluminescence Field in the Black Sea Coastal Waters

2013 ◽  
Vol 49 (3) ◽  
pp. 105-111 ◽  
Author(s):  
Ye. B. Mel'nikova ◽  
Yu. N. Tokarev ◽  
N. V. Burmistrova
Keyword(s):  
Black Sea ◽  
Coastal Waters ◽  
The Black Sea

Oithona davisae: naturalization in the Black sea, inter-annual and seasonal dynamics, effect on the structure of the planktonic copepod community

2019 ◽  
Vol 59 (6) ◽  
pp. 1008-1015
Author(s):  
A. D. Gubanova ◽  
O. A. Garbazey ◽  
D. A. Altukhov ◽  
V. S. Mukhanov ◽  
E. V. Popova
Keyword(s):  
Black Sea ◽  
Coastal Waters ◽  
Native Species ◽  
Significant Decline ◽  
Acartia Tonsa ◽  
The Black Sea ◽  
Copepod Community ◽  
Oithona Davisae ◽  
Sevastopol Bay

Long-term (20032014) routine observations of zooplankton in Sevastopol Bay (the Black Sea) have allowed the naturalization of the invasive copepod Oithona davisae to be studied in the Black Sea coastal waters. Inter-annual and seasonal variability of the species and their impact on the native copepod community have been analyzed. The invasion of O. davisae and their undoubted dominance in terms of abundance were shown to alter the community structure but, at the same time, the abundances of the native species did not decrease, excepting the Black Sea earlier invader Acartia tonsa. A significant decline in A. tonsa numbers over the stages of O. davisae establishment and naturalization provided evidence of competition between the species. O. davisae have been demonstrated to gain competitive advantage over A. tonsa, that ensured their fast dispersal in the Black Sea, acclimatization in the new habitat and the successful competition over native species.

ANALYSIS OF THE FUNCTIONING OF MARINE ECOSYSTEMS ON CHANGING THE PARAMETERS OF THE BIOLUMINESCENCE FIELD ON THE CRIMEAN BLACK SEA SHELF

2017 ◽  
Author(s):  
Svetlana Rubtsova ◽  
Svetlana Rubtsova ◽  
Natalya Lyamina ◽  
Natalya Lyamina ◽  
Aleksey Lyamin ◽  
...  
Keyword(s):  
Black Sea ◽  
Field Intensity ◽  
Deep Water ◽  
Coastal Waters ◽  
Integrated Management ◽  
Abiotic Factors ◽  
Environmental Safety ◽  
The Black Sea ◽  
Intensity Increase ◽  
First Time

The concept of a new approach to environmental assessment is offered in the system of integrated management of the resource and environmental safety of the coastal area of the Black Sea. The studies of the season and daily changeability in the bioluminescence field in the Sevastopol coastal waters has been conducted. For the first time considerable differences in the bioluminescence field seasonal changes in the surface and deep water layers and the reasons conditioning this phenomenon have been shown, using a method of multidimensional statistical analysis. The bioluminescence field vertical profile change in the Black sea coastal waters in the autumn period at night has been studied. It has been shown that according to the character of bioluminescence parameters dynamics a water column can be divided into layers: upper (0 – 35 m) and deep water (36 – 60 m). It has been revealed that life rhythms of the plankton community are the main reason for the bioluminescence field intensity variability. It has been revealed that 14-hour periodicity of the bioluminescence field is related to the changes in light and its variations with 2,5…4,5 hours are conditioned by planktonts endogenous daily rhythms. And here biotic factors effect mostly periodicity of the bioluminescence field intensity increase and fall down at the dark time of the day. Abiotic factors are of less importance in circadian rhythmic of the bioluminescence field in the neritic zone.

Sign in / Sign up

Export Citation Format

Share Document