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2 International Journal of Ecohydrology and Hydrobiology

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Seasonal variability of aquatic chemistry and phytoplankton communities in a shallow floodplain lake of the Daugava River, Latvia

100%

Gruberts D. , Druvietis I. , Klavins M.

tom 05

nr 2

Seasonal changes of water level, aquatic chemistry and phytoplankton composition of the Daugava’s floodplain lake Grīvas was studied in 1999. Significant influence of the Daugava’s floods on the lake’s water level was found. Filling, drainage and isolation phases in hydrological regime of the lake were distinguished. The Daugava’s floodwater influx in April caused considerable water level rising and dilution of the lake’s water column. Small diatoms and greens formed the spring maximum at the highest water level. After the floods, concentration of total diluted solids and nutrients increased, typical planktonic algae species were replaced by epiphytic and benthic species and rich macrophyte vegetation developed as in other shallow lakes.

Water quality in cutaway peatland lakes in Seda mire, Latvia

63%

Klavins M. , Kokorite I. , Springe G. , Skuja A. , Parele E. , Rodinov V. , Druvietis I. , Strake S. , Urtans A.

tom 10

nr 1

Transformation into shallow lakes can be a major post-harvesting land-use option for cutaway peatlands. We focused on lakes created on areas of a cutaway bog in the Seda Mire, Latvia, and the aim of our study was to analyse factors influencing water quality and communities in the cutaway lakes. It has been found that the residual peat amount and the lake feeding conditions (the balance between ground water and inflow from adjacent river during the spring season) are the major factors influencing aquatic chemistry and studied habitats. The studied cutaway lakes can not be considered as typical bog lakes regarding hydrochemical composition (especially concentrations of major dissolved ions, pH and water colour) and hydrobiological features (metabolic activity, biomasses and number of species in phytoplankton and zoobenthos). Considering aquatic chemistry and community structure of the cutaway lakes, a recommendation has been made in respect to peat excavation to transform peat mining sites to lakes.