Abstract
The interannual and long-term variability of abiotic characteristics and chlorophyll content is studied in reservoirs of the Middle Volga River by field observations in the summer period of 2015–2020. Water transparency increases from 1.2 ± 0.1 m in the Gorky Reservoir to 1.5 ± 0.1 m in the Kuibyshev Reservoir and electrical conductivity from 206 ± 2 to 315 ± 7 µS/cm, respectively. Water color decreases from 53 ± 1 to 38 ± 1; all these features reflect the pronounced zoning of the Volga River cascade. The water temperature depends on local weather conditions. The concentration of Ptot increases from 68 ± 3 μg/L in the Gorky Reservoir up to 145 ± 7 μg/L in the Kuibyshev Reservoir; the concentration of Ntot (1.08 ± 0.05–1.14 ± 0.06 mg/L) changes insignificantly. The content of Chl a averages 10.9 ± 0.7, 26.7 ± 3.9, and 9.2 ± 1.0 μg/L in the Gorky, Cheboksary, and Kuibyshev reservoirs, respectively; this parameter ranges widely and is characterized by interannual variability. The trophic status of the Gorky and Kuibyshev reservoirs in different years varies from mesotrophic to moderately eutrophic and eutrophic; the Cheboksary Reservoir is characterized as eutrophic throughout the entire 6-year period. The low correlation coefficients between the content of Chl a and abiotic characteristics indicates the complex and multicomponent influence of external conditions on the phytoplankton development.
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Abbreviations: BE, biogenic elements; Chl a, chlorophyll a; F, Fisher’s test; n, number of observations; Ntot, total nitrogen; N-N\({\text{O}}_{3}^{ - }\), nitrate nitrogen; p, significance level; Ptot, total phosphorus; P-P\({\text{O}}_{4}^{{3 - }}\), phosphate phosphorus; r, Pearson correlation coefficient; rs, Spearman’s rank correlation coefficient; R2, coefficient of determination; Cv, coefficient of variation.
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Mineeva, N.M., Poddubny, S.A., Stepanova, I.E. et al. Abiotic Factors and Their Role in Phytoplankton Development in Reservoirs of the Middle Volga River, Russia. Inland Water Biol 15, 729–739 (2022). https://doi.org/10.1134/S1995082922060141
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DOI: https://doi.org/10.1134/S1995082922060141