Restoration and recovery of shallow eutrophic lake ecosystems in The Netherlands: epilogue

Liere, Louis Van; Gulati, R. D.

doi:10.1007/978-94-011-2432-4_26

Cited by 25 publications

(16 citation statements)

References 18 publications

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“…Previous studies have shown that the water quality of eutrophic freshwater lakes has failed to improve despite a drastic reduction in external contaminant loading because of increased internal loading from the sediments (Sas 1989;Van Liere and Gulati 1992;Istvánovics and Somlyódy 2001;Lai and Lam 2008). However, our results suggest that the internal loading may be even more significant in the case of Saemangeum Lake.…”

Section: Discussioncontrasting

confidence: 78%

Enhanced Benthic Nutrient Flux During Monsoon Periods in a Coastal Lake Formed by Tideland Reclamation

Kim

Lee

et al. 2009

Estuaries and Coasts

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Sediment and water quality were investigated in an artificial coastal lake (Saemangeum Lake, Korea) that was formed by constructing a 33-km long sea-dyke offshore from the mouths of two adjacent rivers, which discharge into the Yellow Sea. Sediment showed drastic increases in fine fraction (silt and clay) after the dyke construction. TN, TP, and OC contents in the sediment showed the similar spatial variation to that of fine fraction. A mixing model indicated benthic fluxes of nutrients such as PO 4 , NH 4 , and SiO 2 , which were considerably elevated during the summer monsoon season. It is revealed that this phenomenon was associated with the development of strong salinity stratification, elevated water temperature, and increased groundwater discharge. However, a change in the sedimentation environment due to dyke construction is suggested as the primary reason for the enhanced benthic fluxes.

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Section: Discussioncontrasting

confidence: 78%

Enhanced Benthic Nutrient Flux During Monsoon Periods in a Coastal Lake Formed by Tideland Reclamation

Kim

Lee

et al. 2009

Estuaries and Coasts

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“…Large shallow lakes, in particular, have received attention in special symposia in Europe (e.g., Van Liere & Gulati, 1992), and now in Asia (this special issue). Such lakes contain a large percentage of the world's fresh water, provide ecosystem services to hundreds of millions of people, and are located in areas prone to anthropogenic and climactic impacts.…”

Section: Discussionmentioning

confidence: 99%

Phosphorus dynamics at multiple time scales in the pelagic zone of a large shallow lake in Florida, USA

et al. 2007

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Phosphorus (P) dynamics in large shallow lakes are greatly influenced by physical processes such as wind-driven sediment resuspension, at times scales from hours to years. Results from long-term (30 year) research on Lake Okeechobee, Florida (area 1,730 km 2 , mean depth 2.7 m) illustrate key features of these P dynamics. Variations in wind velocity result in changes in water column transparency, suspended solids, and total P (TP). In summer there are diurnal changes in TP associated with afternoon winds, and in winter, when strong winds occur for multiple days, monthly average TP remains high compared to summer. The magnitude of daily and seasonal TP changes can exceed 100 lg l -1 . Hurricanes and tropical storms also cause extreme changes in TP that are superimposed on seasonal dynamics. When a hurricane passed 80 km south of the lake in October 1999, mean pelagic TP increased from 88 to 222 lg l -1 . During large resuspension events, light attenuation is substantially increased, and this influences the biomass and spatial extent of submerged plants, as well as water column TP. In Lake Okeechobee, TP concentrations typically are~20 lg l -1 when submerged plants are dense, and soluble reactive P concentrations are reduced below detection, perhaps by the periphyton and plant uptake and by precipitation with calcium at high pH. In contrast, TP exceeds 50 lg l -1 when submerged plants and periphyton are absent due to prolonged deep water, and phytoplankton biomass and algal bloom frequency both are increased. In Lake Okeechobee and other large shallow lakes, complex models that explicitly consider wind-wave energy, hydrodynamics, and sediment resuspension, transport, and key biological processes are needed to accurately predict how lake water TP will respond to different management options.

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“…For such shallow lakes in the Netherlands, e.g. Loosdrecht lakes (Van Liere and Gulati, 1992), the failure of restoration studies is partly attributed to the wind-induced turbid conditions, i.e. poor light climate to which cyanobacteria are well adapted.…”

Section: Prevention Of Sediment Resuspensionmentioning

confidence: 99%

Lake restoration studies: Failures, bottlenecks and prospects of new ecotechnological measures

2008

Self Cite

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This paper critically reviews the published works on lake restoration in north-western Europe, with the aim to highlight the causes of failures of lake biomanipulation, and to identify the main bottlenecks that have impeded progress. More importantly, we explore the prospects of applying new ecotechnological measures to lakes with a focus on shallow lakes. These complementary measures are: (1) reduction of sediment resuspension; (2) water-level management; and (3) the use in shallow lakes of bivalves as effective grazers on lake seston, especially when cyanobacteria are dominant. If the sustainability of the positive effects of biomanipulation is considered over a decade, there are probably more cases of failures than successes. The failures can be ascribed to several bottlenecks that include: (1) inadequate reduction of allochthonous phosphorus (P) and an increase in autochthonous P inputs, i.e. release of P from the lake sediments following reductions of external P inputs; (2) poor edibility of filamentous and colonial cyanobacteria to daphnids; (3) inadequate coverage of the lake area by macrophytes partly due to foraging on the macrophytes by both fish and birds; (4) ineffective reduction of planktivorous fish biomass and our inability to maintain the fish mass to a 'low level' for longer periods; and (5) failure of northern pike (Esox lucius) after its transplantation to the lakes to develop a population level that can control planktivorous fish to desired low levels. Three potentially complementary ecotechnological measures are discussed. The first such measure concerns prevention of sediment resuspension in lakes by creating islands in order to minimise the wind fetch to reduce the wave amplitude. The second measure involves allowing greater water-level fluctuations (WLF) in lakes as planned in lowland countries like the Netherlands; WLF are likely to allow more space for water, and may lead to improved water quality and higher biodiversity. The third ecotechnological measure relates to grazer populations that complement herbivorous zooplankton to regulate phytoplankton, particularly to control cyanobacterial blooms. For this, the bivalve Dreissena polymorpha appears to be a good potential candidate for grazing on phytoplankton, especially in shallow eutrophic lakes that are dominated by filamentous and toxic cyanobacteria (e.g. Planktothrix agardhii and Microcystis aeruginosa).

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Restoration and recovery of shallow eutrophic lake ecosystems in The Netherlands: epilogue

Cited by 25 publications

References 18 publications

Enhanced Benthic Nutrient Flux During Monsoon Periods in a Coastal Lake Formed by Tideland Reclamation

Enhanced Benthic Nutrient Flux During Monsoon Periods in a Coastal Lake Formed by Tideland Reclamation

Phosphorus dynamics at multiple time scales in the pelagic zone of a large shallow lake in Florida, USA

Lake restoration studies: Failures, bottlenecks and prospects of new ecotechnological measures

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