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- Title
The role of a eutrophic lowland reservoir in shaping the composition of river phytoplankton.
- Authors
Grabowska, Magdalena
- Abstract
The manuscript documents the role of a shallow eutrophic reservoir, Siemianówka Dam Reservoir, in deterioration of water quality in a dammed lowland river basin. Changes in phytoplankton composition and abundance were observed along a 152.5 km section of the Narew River. Favourable conditions for phytoplankton growth (TN > 1.5 mg dm-3, TP > 100 μg dm-3, water temperature between 18-25°C, pH 6-9) in the reservoir resulted in a more than one hundred fold increase in phytoplankton biovolume. The signifi cant effect of limnoplankton on potamoplankton was manifested by the dominance of Cyanobacteria from mid-summer to autumn in the river reach below the dam. Water retention time, daily water outfl ow and molar TN:TP ratio were the factors favouring mass development of Cyanobacteria in the reservoir. However, the meandering character and low fl ow velocities in the outfl owing river, together with the way of operating the dam gates, favoured the Cyanobacteria development in the river reach below the dam. The study demonstrated that water retention time exceeding 3 months in shallow dam reservoirs signifi cantly increases the risk of river water quality deteriorating as a result of mass development of Cyanobacteria.
- Subjects
EUTROPHICATION; DESTRATIFICATION of reservoirs; WATER quality; STREAMFLOW velocity; PHYTOPLANKTON; CYANOBACTERIA
- Publication
Ecohydrology & Hydrobiology (International Institute of the Polish Academy of Sciences, European Regional Centre for Ecohydrology), 2012, Vol 12, Issue 3, p231
- ISSN
1642-3593
- Publication type
Article
- DOI
10.1016/S1642-3593(12)70206-9