The role of ecological groups in the formation of cyanobacterial communities in the ecosystems of the North Azov region (Ukraine)

Солоненко, А. Н.; Arabadzhy-Tipenko, L. I.; Кунах, О. М.; Kovalenko, D. V.

doi:10.15421/012028

Cited by 5 publications

(7 citation statements)

References 113 publications

(110 reference statements)

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“…There are species that are found in highly shaded habitats, for example, in the soil under the dense canopy of higher plants [25,26], above-water and underwater caves, in deep water layers [27][28][29]. Other species are adapted to growth in direct sunlight, for example, in polar, tropical deserts [30][31][32], on salt marshes and other open surfaces [33][34][35][36], where the light intensity can reach 2000 µmol photons m −2 s −1 [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Light Conditions on Microalgae Growth and Content of Lipids, Carotenoids, and Fatty Acid Composition

Maltsev

Maltseva

Kulikovskiy

et al. 2021

Biology

214

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Microalgae are a valuable natural resource for a variety of value-added products. The growth of microalgae is determined by the impact of many factors, but, from the point of view of the implementation of autotrophic growth, light is of primary importance. This work presents an overview of the influence of light conditions on the growth of microalgae, the content of lipids, carotenoids, and the composition of fatty acids in their biomass, taking into account parameters such as the intensity, duration of lighting, and use of rays of different spectral composition. The optimal light intensity for the growth of microalgae lies in the following range: 26−400 µmol photons m−2 s−1. An increase in light intensity leads to an activation of lipid synthesis. For maximum lipid productivity, various microalgae species and strains need lighting of different intensities: from 60 to 700 µmol photons m−2 s−1. Strong light preferentially increases the triacylglyceride content. The intensity of lighting has a regulating effect on the synthesis of fatty acids, carotenoids, including β-carotene, lutein and astaxanthin. In intense lighting conditions, saturated fatty acids usually accumulate, as well as monounsaturated ones, and the number of polyunsaturated fatty acids decreases. Red as well as blue LED lighting improves the biomass productivity of microalgae of various taxonomic groups. Changing the duration of the photoperiod, the use of pulsed light can stimulate microalgae growth, the production of lipids, and carotenoids. The simultaneous use of light and other stresses contributes to a stronger effect on the productivity of algae.

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Section: Introductionmentioning

confidence: 99%

Influence of Light Conditions on Microalgae Growth and Content of Lipids, Carotenoids, and Fatty Acid Composition

Maltsev

Maltseva

Kulikovskiy

et al. 2021

Biology

214

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“…In salt marshes, the role of Cyanobacteria becomes even more pronounced (table 1). A wide variety of Chlorophyta and Cyanobacteria was also noted for other xerophytic ecosystems [53][54][55], as well as saline soils and salt marshes [6,11,56,57]. Thus, within each ecosystem, a specific ecological space is formed, which is assimilated by various taxa of microalgae.…”

Section: Resultsmentioning

confidence: 91%

“…The analysis was carried out on the basis of material collected in 2000-2013 in the south and southeast of Ukraine in oak (5 ecosystems), alder (4), aspen-birch (3), and pine (6) forest ecosystems in the floodplains of the Samara, Severskiy Donets, Vovcha, Molochna rivers, in oak (8) forest ecosystems in gullies (ravine oak forests), in the steppe (11) and saline (3)in flat habitats. Within each ecosystem, 5 soil samples each with a volume of 25 cm 3 were randomly selected to determine the species composition of microalgae, as well as a number of physicochemical parameters of the soil: pH (water), humus (%), the sum of salts (dry residue, %), particle size distribution (content of physical clay, %).…”

Section: Methodsmentioning

confidence: 99%

“…The forest and herbaceous ecosystems have different abilities to influence the formation of their internal phytocenotic environment and the composition of the organisms that inhabit them [2][3][4][5]. The various studies have shown the specific features of algal communities in forest, steppe, desert, and other ecosystems [6][7][8][9][10][11]. This is consistent with the definition of the essence of the ecosystem, 1049 (2022) 012072 IOP Publishing doi:10.1088/1755-1315/1049/1/012072 2 where it is represented by a set of interconnected organisms that function in the same territory and interact with the environment in such a way that the flow of energy forms clearly defined biotic structures and the circulation of substances between the living and nonliving components.…”

Section: Introductionmentioning

confidence: 99%

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Ecological determinants of algal communities of different types of ecosystems

Maltseva

Shcherbyna

Yakoviichuk

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The results of studies of the environmental regularities of the formation of algal communities in soils of various ecosystems in the south of Ukraine are presented. 26 forest, 11 steppe and 3 saline ecosystems were investigated. The research has established the species richness of algae in each ecosystem and produced a multidimensional ordination of algal communities based on the analysis of the main components to clarify the factors that determine the composition of algal communities. The research has established the species richness of algae in each ecosystem and produced a multidimensional ordination of algal communities based on the analysis of the main components to clarify the factors that determine the composition of algal communities. Predictors determined by edaphic conditions and phytocenotic interactions associated primarily with edificators of ecosystems were used for the analysis. The ecological space of the studied ecosystems was formed by four main factors with eigenvalues greater than one, which explained 81.4% of the total variance. PC1 (34.82% of variance) is associated with the type of ecosystem and such edaphic parameters as pH, the availability of moisture in the habitat, and soil mineralization. PC2 (21.98%) reflects changes in the gradients of trophicity (humus content) and granulometric composition of soils. PC3 and PC4 additionally explain 16.04% and 9.27% of the total data variance, respectively. Their values mainly depend on the mineralization, trophicity, and moisture supply of edaphotopes, which, at the level of the composition of algae, is obviously associated with the heterogeneity of the ecological preferences of the algal species themselves, as well as the variability of ecological niches of ecosystems, due to which there are species more typical for other types of ecosystems in the communities. The use of the factor rotation procedure by the Varimax normalized method made it possible to concretize the taxa most associated with the main components: PC1 indicates the various Cyanobacteria species, PC2 – Chlorophyta, Streptophyta and Eustigmatophyceae, PC3 – Xanthophyceae and Euglenozoa, PC4 – Bacillariophyceae.

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“…The current state of the ecosystem of the Azov Sea is in "ecological crisis" due to the process of eutrophication [1]. The depressed state of the reservoir has become as a consequence of the mass multiplication of microalgae of cyanobacteria Nodularia spumigena, dinophyte alga Lingulodinium polyedra and Centric diatoms called "water blooms" and decreased water transparency [2][3][4]. The process of "water blooms" was the result of intensive anthropogenic impact through nutrient inputs, radioactive and chemical contamination of water, dumping, and sand mining in the sea [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Morphological response of lagoon cockle Cerastoderma glaucum (Poiret, 1789) to eutrophication in the Sea of Azov

Mirzoeva

Demchenko

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The bivalve species Cerastoderma glaucum (Poiret, 1789) was studied in this study. This species is allochthonous and belongs to the Mediterranean zoogeographic complex and was introduced in the Holocene. The C. glaucum is the dominant species among the bivalves in the Sea of Azov and has a wide range of distribution. The species is distributed in the coastal zone within 100-300 m from the shore, and it is also found in desalinated water bodies such as estuaries. The C. glaucum is fairly resistant to hypoxia. It is euryhaline with respect to salinity and eurybiontic with respect to soil. The species can settle on sandy, muddy or sandy-silty substrate. The aim of the study was to investigate the morphology of shells of this species in order to find out the reasons of morphological features change of Cerastoderma glaucum in different biotopes of the Sea of Azov. The study was conducted in early June 2021 on the northwestern coast of the Azov Sea. A total of 20 stations were investigated. Cerastoderma glaucum was found at all stations. The morphological variability of the bivalve Cerastoderma glaucum was investigated using the method of discriminant analysis. A notable morphological feature was the external alteration of the mollusc shell. A displacement of the apex to the anterior edge of the shell, lengthening of the posterior edge, and deformation of the shell shape, indicating the ecological characteristics of the study area and its inhabitants. Also, there is a difference in the ratio of shell height to shell length, indicating an increased level of siltation in the ground. Shell thickness varies in all survey areas, indicating different levels of salinity. The overall abundance of molluscs from the different biotopes indicates the factors determining the shape of cockle shells. In turn, morphological parameters indicate the general condition of the Sea of Azov. So, it can be assumed that siltation of the substrate on which benthic communities are located has increased as a consequence of massive deposition of phytoorganic residues. In addition, the hydrolytic regime has changed as a result of anthropogenic factors. As a consequence, salinity, oxygen levels are changing, etc.

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The role of ecological groups in the formation of cyanobacterial communities in the ecosystems of the North Azov region (Ukraine)

Cited by 5 publications

References 113 publications

Influence of Light Conditions on Microalgae Growth and Content of Lipids, Carotenoids, and Fatty Acid Composition

Influence of Light Conditions on Microalgae Growth and Content of Lipids, Carotenoids, and Fatty Acid Composition

Ecological determinants of algal communities of different types of ecosystems

Morphological response of lagoon cockle Cerastoderma glaucum (Poiret, 1789) to eutrophication in the Sea of Azov

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