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Restoration and Lake Management

  • Karl DonabaumEmail author
  • Martin T. Dokulil
Chapter
Part of the Aquatic Ecology Series book series (AQEC, volume 10)

Abstract

At the beginning of the 1990ies Alte Donau was characterized by severe eutrophication problems, leading to a deterioration of water quality. The former macrophyte-dominated state changed by a catastrophic shift to a turbid state dominated by high biomass of filamentuous cyanobacteria, associated with a significant reduction in transparency. A holistic lake management concept was developed to restore macrophyte domination. Integrated restoration plans included internal and external measures. Improvements in the catchment aimed to minimize the input of nutrients from contaminated groundwater, from sewage and from storm waters. Internal measures included aeration, water exchange, chemical flocculation and nitrate oxidation of the sediments (Riplox treatment). The main measures were followed by biomanipulation actions like selective fish stocking, planting of macrophytes and weed management after recovery. Technical measures like the simulation of low water levels to enhance the light supply for the macrophytes in early spring or partially water exchange with water from the nearby impoundment Neue Donau to stabilize the buffer capacity of the system to compensate biogenic calcium precipitation are still in progress. Restoration was successfully. Full recovery of Alte Donau was achieved in 2004, when intense macrophyte growth became apparent, consequently triggering the switch to a clear water phase. Since then Alte Donau is in a macrophyte dominated stable state, characterized by high water quality with low nutrient and chlorophyll-a concentrations.

Keywords

Restoration Lake management Alternative stable states Water management measures Resilience 

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.DWS-Hydro-Ökologie GmbHWienAustria

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