Phytoplankton communities of the Vychegda River in the zone of treated wastewater inflow of the pulp and paper industry
E. N. Patova1, A. S. Stenina1, Yu. N. Shabalina2, I. N. Sterlyagova1
1Institute of Biology of Komi Science Centre of the UB of the RAS, Syktyvkar, Russia
2Pitirim Sorokin Syktyvkar State University, Syktyvkar, Russia
Keywords: diversity and quantitative indicators of phytoplankton, waste water from pulp and paper production, Vychegda River, northeast of European Russia
Abstract
The results of a study of summer phytoplankton (July 2018-2020) in the middle reaches of the Vychegda River in the places where treated wastewater is discharged from the Mondi Syktyvkar JSC pulp and paper mill are presented. In the phytoplankton of the investigated section of the River, 263 species with varieties of algae of seven divisions were identified: Cyanoptokaryota - 8, Ochrophyta - 4, Rhodophyta - 1, Euglenophyta - 1, Bacillariophyta - 232, Chlorophyta- 15, Charophyta - 2. Mostly widespread in terms of diversity, eurytopic species. For three years of research, the stability of the complex of dominant species and structural diversity has been noted for phytoplankton communities. The basis of the dominant complexes is formed by species from the genera Aulacoseira , Dolichospermum , Pandorina , Eudorina , Closterium , etc. The composition of dominants is similar for conditionally background points and the zone of discharge of fine waters. Below the wastewater discharge site, a massive development of the thermophilic species of diatom Diadesmis confervacea , an indicator of thermal pollution, was noted. The total number of phytoplankton in the Vychegda River at the studied stations was recorded in the range from 1150 to 18000 thousand cells / dm3, biomass - from 0.01 to 0.29 mg / dm3. The ratio of the total abundance and biomass of phytoplankton algae and indicator species forming a complex of dominants reflect an increase in the trophic status of the waters of the surveyed areas and a high degree of anthropogenic load on the ecosystem of the Vychegda River. On the basis of algoindication, the waters of the conditionally background and receiving wastewaters of observation points were assigned to the III quality class (with the quality category 3b - slightly polluted).
|
