Abstract
Long-term dynamics of water level in Lake Nero (1930–2011) has been analyzed. Pronounced trends, determined by the climate and anthropogenic components have been identified. Up to the 1970s, at a drop in lake water level, the ecosystem still showed the main features of a shallow water body overgrown with macrophytes. Water level rise caused a more intense development of phytoplankton, an increase in biogenic element concentrations, a decrease in water transparency and the contribution of cyanobacteria of S1 codon; pondweed disappeared almost completely. Step-by-step regression analysis of phytoplankton development indices and hydrological characteristics showed that water transparency in Lake Nero depends by 80% directly on water exchange and inversely on the concentration of chlorophyll a in seston. The main hypothesis of the study was confirmed: the key trigger in phytoplankton–macrophytes competition is water level rise.
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Original Russian Text © O.V. Babanazarova, S.I. Sidelev, S.M. Zhdanova, A.S. Litvinov, A.S. Ovseenko, K.P. Korovkina, 2018, published in Vodnye Resursy, 2018, Vol. 45, No. 6, pp. 629–639.
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Babanazarova, O.V., Sidelev, S.I., Zhdanova, S.M. et al. Water Level in a Shallow Highly Eutrophic Lake: Development Factor by Macrophyte or Phytoplankton Type: Case Study of Lake Nero, Yaroslavl Oblast. Water Resour 45, 897–907 (2018). https://doi.org/10.1134/S0097807818060027
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DOI: https://doi.org/10.1134/S0097807818060027