Macroflora in Lake Ülemiste (Estonia) – changes and the impact of environmental factors

Pedusaar, Tiia; Trei, Tiiu

doi:10.3176/biol.ecol.2006.3.02

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Proceedings of the Estonian Academy of Sciences. Biology. Ecolo

2006

DOI: 10.3176/biol.ecol.2006.3.02

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Macroflora in Lake Ülemiste (Estonia) – changes and the impact of environmental factors

Tiia Pedusaar¹,

Tiiu Trei²

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Cited by 2 publications

References 16 publications

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Reconstruction of the Time Series of the Underwater Light Climate in a Shallow Turbid Lake

Reinart

Pedusaar

2006

Aquat Ecol

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Lake Ü lemiste is a shallow, eutrophic lake which has served the city of Tallinn as a water reservoir for many centuries. Its light climate was studied by combining a routinely measured data set with a modelling approach. For 26 years , data was collected on such optically active substances (OAS) and water parameters as water colour, turbidity and phytoplankton biomass. Simple modelling enabled the quantification of long-term time-series data and the subsequent calculation of the diffuse attenuation coefficient, euphotic depth and average light of the mixed layer. Several changes in the hydrological cycle have taken place during the period under study, among which are an increase in the water level of about 0.5 m and a decrease in the external water load from 108 million m 3 year -1 to about 25 million m 3 year -1 . At the same time euphotic depth has shown a distinct trend towards increasing since the early 1990s. The euphotic depth also showed an increase (from 1.1 to 1.4 m) due to an improvement in underwater light conditions -mainly in the spring (April and May) and autumn (October and November) because of the lower amount of dissolved organic matter in the lake. The average light availability in the mixed layer has increased, but this has not affected the phytoplankton biomass as the latter is not light-limited during the summer period.

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Reconstruction of the Time Series of the Underwater Light Climate in a Shallow Turbid Lake

Reinart

Pedusaar

2006

Aquat Ecol

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Biomanipulating the drinking water reservoir of Estonia's capital city: Prospects for success

et al. 2008

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The possibility of utilizing biomanipulation to improve the water quality of Tallinn's drinking water reservoir (Lake Ülemiste) was analysed on the basis of water quality data, test fishing by different methods, and earlier studies on aquatic plants, light climate and sediments. Eutrophic, polymictic Lake Ülemiste is characterized by a prevalence of high filamentous cyanobacteria biomass, rotifers in the zooplankton community, mature bream in the fish biomass, and a high density of planktivores (YOY perch). Several prerequisites for being a potential target for biomanipulation were identified, including (i) decreased external total phosphorus (TP) loading; and (ii) a sufficient stock of piscivorous fish in the lake. Prohibition of fishing should favour biomanipulation efforts. The potential for recolonization of macrophytes and large Daphnia species in Lake Ülemiste could be judged from historical data. The in-lake TP concentrations are within the limits that facilitate successful restoration. As phytoplankton biomass was significantly limited by phosphorus in Lake Ülemiste, its water quality improvement will be driven primarily by reduced nutrient concentrations, and then by zooplankton grazing. Internal TP loading and a new phytoplankton species community were assessed as major challenges for successful implementation of biomanipulation as a means of improving the water quality of Lake Ülemiste.

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Macroflora in Lake Ülemiste (Estonia) – changes and the impact of environmental factors

Cited by 2 publications

References 16 publications

Reconstruction of the Time Series of the Underwater Light Climate in a Shallow Turbid Lake

Reconstruction of the Time Series of the Underwater Light Climate in a Shallow Turbid Lake

Biomanipulating the drinking water reservoir of Estonia's capital city: Prospects for success

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