Water Level in a Shallow Highly Eutrophic Lake: Development Factor by Macrophyte or Phytoplankton Type: Case Study of Lake Nero, Yaroslavl Oblast
- Authors: Babanazarova O.V.1, Sidelev S.I.1, Zhdanova S.M.2, Litvinov A.S.2, Ovseenko A.S.1, Korovkina K.P.1
- 
							Affiliations: 
							- Yaroslavl State University
- Institute of Inland Water Biology
 
- Issue: Vol 45, No 6 (2018)
- Pages: 897-907
- Section: Hydrochemistry, Hydrobiology: Environmental Aspects
- URL: https://journals.rcsi.science/0097-8078/article/view/174833
- DOI: https://doi.org/10.1134/S0097807818060027
- ID: 174833
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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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About the authors
O. V. Babanazarova
Yaroslavl State University
							Author for correspondence.
							Email: baba@bio.uniyar.ac.ru
				                					                																			                												                	Russian Federation, 							Yaroslavl, 150057						
S. I. Sidelev
Yaroslavl State University
														Email: baba@bio.uniyar.ac.ru
				                					                																			                												                	Russian Federation, 							Yaroslavl, 150057						
S. M. Zhdanova
Institute of Inland Water Biology
														Email: baba@bio.uniyar.ac.ru
				                					                																			                												                	Russian Federation, 							Borok, Yaroslavl oblast, 152742						
A. S. Litvinov
Institute of Inland Water Biology
														Email: baba@bio.uniyar.ac.ru
				                					                																			                												                	Russian Federation, 							Borok, Yaroslavl oblast, 152742						
A. S. Ovseenko
Yaroslavl State University
														Email: baba@bio.uniyar.ac.ru
				                					                																			                												                	Russian Federation, 							Yaroslavl, 150057						
K. P. Korovkina
Yaroslavl State University
														Email: baba@bio.uniyar.ac.ru
				                					                																			                												                	Russian Federation, 							Yaroslavl, 150057						
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