Features of formation and functioning of phytoplankton of a small river Hlybochok (Dnieper basin)
DOI:
https://doi.org/10.29038/2617-4723-2022-1-1-5Keywords:
phytoplankton, Hlybochok river, population, biomass, primary productsAbstract
Based on the analysis of taxonomic composition, information diversity, quantitative indicators of algae groups of plankton, primary products and destruction of organic matter, their temporal and spatial dynamics, the structure and functioning of phytoplankton of a small river are established. by indicator species of algae and biotic indices. For the first time, 74 species of algae, represented by 85 intraspecific taxa, including the nomenclature type of the species, were identified in the phytoplankton of the Hlybochok River.
Phytoplankton of the Hlybochok River was characterized as green-eugleno-diatomaceous by the number of species and intraspecific taxa, as well as the composition of the leading genera. For the first time, 9 species (11 v.v.t.) were identified - new for Ukrainian Polissya.
In the structure of the phytoplankton of the watercourse, the leading role belonged to planktonic forms, oligogalobals-indifferent in relation to halo, indifferent in relation to pH and rheophilicity of waters and their oxygen saturation. The predominance of saprobity indicators corresponding to class III water quality was noted in the watercourse, but class II indicators are also statistically significant.
The frequency of occurrence in the phytoplankton of the Hlybochok River was dominated by blue-green (average frequency reached
13.6%), green (7.7%), diatoms (6.2%) and euglenae algae (4.8%). The maximum frequency of occurrence were: Chlamydomomas globosa Snow (67%), Oscillatoria amphibia Ag. ex Gom. (55%), Oscillatoria planctonicа Wolosz. (41%), Aphanizomenon flos-aquae (Lyngb.) Breb. (31%), Traсhelomonas volvocina Ehrb. (33%).
The average biomass during 2019–2020 was 2,17 0,15 mg / dm3, the number was 56,15 1,30 million cells / dm3. Structural departments in the formation of biomass in the spring were – Dinophyta (32%), Chlorophyta (26%), Cyanoprokaryota (24%), in the summer – Cyanoprokaryota (80%), Chlorophyta (10%), in autumn – Cyanoprokaryota (78%), Chlorophyta (10%).
According to the phytoplankton biomass and the intensity of photosynthesis, the Hlybochok River belongs to the III class of water
quality. The predominance of production processes over destructive ones in the river indicates the autotrophic direction of production-destructive processes and testifies to the processes of self-pollution of the river ecosystem due to intensive vegetation of algae.
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