Upscaling biomanipulation in 600 ha Lake Zuidlaardermeer

1995 ◽  
Vol 31 (8) ◽  
pp. 235-238
Author(s):  
C. Roos ◽  
M. Klinge ◽  
J. Heringa ◽  
D. A. de Vries ◽  
R. Torenbeek
Keyword(s):  
The Netherlands ◽  
Water Chemistry ◽  
Chlorophyll A ◽  
Fish Community ◽  
Submerged Macrophytes ◽  
Northern Pike ◽  
Emergent Vegetation ◽  
Ecological Rehabilitation ◽  
Significant Step ◽  
Total P

In the 600 ha Lake Zuidlaardermeer in The Netherlands enclosure experiments were carried out in order to test the feasibility of biomanipulation. In two enclosures of 625 m2 each the effects of reduction of fish and wind and waves on water chemistry, phyto- and zooplankton and submerged macrophytes were studied and compared to the lake. In the “fishless” enclosure transparency increased from 40 to 120 cm, chlorophyll-a dropped from 70 to 20 μg/l, total-P dropped from 0.20 to 0.10 mg/l, Daphnia sp. > 1 mm increased from 30 to 130 individuals/l and submerged macrophytes returned. The “fish” enclosure largely behaved in a way intermediate between the “fishless” enclosure and the lake: transparency increased to 60 cm, chlorophyll-a dropped to 40 μg/l, total-P dropped to 0.12 mg/l and Daphnia sp. > 1 mm increased to 80/l. Submerged macrophytes however did not develop. The experiments show the potential of the lake for ecological rehabilitation. Nevertheless the effect of wind and waves on a larger scale remains uncertain. Therefore plans have been made to build a larger enclosure (40–100 ha). In this way, the effects of fish and wind and waves can be studied on a larger scale while at the same time recovery of the submerged macrophytes within this enclosure will be a significant step towards ecological rehabilitation of the whole lake. Beside the return of the submerged macrophytes the management is also aimed at the development of substantial amounts of emergent vegetation, thus supporting enough Northern Pike (Esox lucius L.) for regulation of the planktivorous fish community.

Trend-analysis of eutrophication variables in lakes in The Netherlands

1998 ◽  
Vol 37 (3) ◽  
pp. 235-240 ◽  
Author(s):  
Rob Portielje ◽  
Diederik T. Van der Molen
Keyword(s):  
The Netherlands ◽  
Trend Analysis ◽  
Chlorophyll A ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Negative Trend ◽  
Total N ◽  
Total P

A trend-analysis of eutrophication variables was performed for a large number of lakes in The Netherlands. Data of in total 231 lakes were available. Data on chlorophyll-a, total phosphorus (total-P) and total nitrogen (total-N) were analysed over the period 1980-1996. Summer-averaged concentrations for chlorophyll-a, total-P and total-N decreased in respectively 65%, 73% and 75 of the lakes with at least eight years data between 1980 and 1996. Results for winter means were comparable (a negative trend in 54%, 77% and 69% for concentrations of chlorophyll-a, total-P and total-N respectively). Since 1980 the median decrease in the summer averaged concentrations of chlorophyll-a, total-P and total-N is 2.61 μg l−1 y−1, 0.008 mg l−1 y−1 and 0.046 mg l−1 y−1, respectively, illustrating the effects of (inter)national and regional measures to combat eutrophication.

The habitat evaluation procedure as a tool for ecological rehabilitation of wetlands in the Netherlands

1995 ◽  
Vol 31 (8) ◽  
pp. 387-391
Author(s):  
H. Duel ◽  
B. P. M. Specken ◽  
W. D. Denneman ◽  
C. Kwakernaak
Keyword(s):  
The Netherlands ◽  
Ecological Impact ◽  
Evaluation Procedure ◽  
Habitat Requirements ◽  
Tidal Wetlands ◽  
Ecological Rehabilitation ◽  
Assessment And Evaluation ◽  
Habitat Evaluation ◽  
First Results ◽  
The Usa

In the USA, the Habitat Evaluation Procedure (HEP) has become a standard approach for impact assessment and evaluation of measures and management activities causing changes in the environmental conditions of the habitats for fauna species. Recently, the method was implemented in The Netherlands. HEP is used to predict the ecological impact of measures and management activities concerning the ecological rehabilitation of rivers, tidal wetlands, lakes and marshes. For more than 30 fauna species the habitat requirements and preferences have been modelled. Examples of species-habitat relationships are presented. First results of the application of the method in ecological rehabilitation projects of rivers, lakes and marshes are presented. The results show that the HEP approach is a useful tool in ecological water management.

scholarly journals Removal of Positively Buoyant Planktothrix rubescens in Lake Restoration

Toxins ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 700 ◽  
Author(s):  
Miquel Lürling ◽  
Maíra Mucci ◽  
Guido Waajen
Keyword(s):  
Hydrogen Peroxide ◽  
The Netherlands ◽  
Chlorophyll A ◽  
Lake Restoration ◽  
Low Dose ◽  
Cyanobacterial Blooms ◽  
Similar Species ◽  
Modified Bentonite ◽  
Planktothrix Rubescens ◽  
Polyaluminium Chloride

The combination of a low-dose coagulant (polyaluminium chloride—‘Floc’) and a ballast able to bind phosphate (lanthanum modified bentonite, LMB—‘Sink/Lock’) have been used successfully to manage cyanobacterial blooms and eutrophication. In a recent ‘Floc and Lock’ intervention in Lake de Kuil (the Netherlands), cyanobacterial chlorophyll-a was reduced by 90% but, surprisingly, after one week elevated cyanobacterial concentrations were observed again that faded away during following weeks. Hence, to better understand why and how to avoid an increase in cyanobacterial concentration, experiments with collected cyanobacteria from Lakes De Kuil and Rauwbraken were performed. We showed that the Planktothrix rubescens from Lake de Kuil could initially be precipitated using a coagulant and ballast but, after one day, most of the filaments resurfaced again, even using a higher ballast dose. By contrast, the P. rubescens from Lake Rauwbraken remained precipitated after the Floc and Sink/Lock treatment. We highlight the need to test selected measures for each lake as the same technique with similar species (P. rubescens) yielded different results. Moreover, we show that damaging the cells first with hydrogen peroxide before adding the coagulant and ballast (a ‘Kill, Floc and Lock/Sink’ approach) could be promising to keep P. rubescens precipitated.

The Effects of Water Chemistry on the Growth of Scorpidium scorpioides in Canada and The Netherlands

1993 ◽  
Vol 96 (1) ◽  
pp. 106 ◽  
Author(s):  
Dale H. Vitt ◽  
Geert Van Wirdum ◽  
Linda Halsey ◽  
Steve Zoltai
Keyword(s):  
The Netherlands ◽  
Water Chemistry

An Experimental Study of Piscivore–Planktivore Interactions: Population and Community Responses to Predation

1992 ◽  
Vol 49 (6) ◽  
pp. 1176-1183 ◽  
Author(s):  
Xi He ◽  
Russell A. Wright
Keyword(s):  
Fish Community ◽  
Northern Pike ◽  
Community Response ◽  
Fish Biomass ◽  
Prey Fish ◽  
Short Term ◽  
Population Responses ◽  
Numerical Resolution ◽  
Four Levels ◽  
And Behavior

The population dynamics and behavior of an assemblage of fishes in a small bog lake were studied in a succession of whole-lake manipulations of piscivores. Total prey fish biomass declined after the addition of northern pike (Esox lucius). This decline was the result of emigration by cyprinid prey and consumption by northern pike. The emigration response of the cyprinids was dependent on cyprinid density. At high prey fish biomass, a significant portion of the loss in biomass was the result of emigration; this was not the case at low prey fish biomass. The prey fish community shifted from small-bodied soft-rayed species prior to the introduction of northern pike to species with spines or deep bodies after predator stocking. The community response was analyzed at four levels of numerical resolution: absolute, relative, and ranked abundance and presence–absence of prey species. High numerical resolution captured the dynamic short-term population responses to predation and suggests unstable community structure.

Full Scale Experiences with Nutrient Removal at Two Wastewater Treatment Plants in The Netherlands

1993 ◽  
Vol 27 (5-6) ◽  
pp. 343-355 ◽  
Author(s):  
H. Draaijer ◽  
A. H. M. Buunen-van Bergen ◽  
E. van't Oever ◽  
A. A. J. C. Schellen
Keyword(s):  
The Netherlands ◽  
Total Nitrogen ◽  
Wastewater Treatment Plants ◽  
Full Scale ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Total N ◽  
Side Stream ◽  
Biological Phosphorus ◽  
Total P

Two full scale projects are described in this paper; these are the Bergambacht wastewater plant (carrousel) and the Terneuzen wastewater plant (Schreiber system). Both plants use a system of intermittent aeration to combine nitrification and denitrification processes. At the Bergambacht plant biological phosphorus removal is carried out by the introduction of the side stream process. At the Terneuzen plant it is carried out by introducing anaerobic periods in the aeration tanks. The objective is to meet the new total nitrogen and phosphorus effluent standards in The Netherlands of resp. 10-15 and 1-2 mg/l. At the Terneuzen wastewater plant the standards could not be reached for total-nitrogen, mainly due to the low BOD to Kj-N ratio of 2:8 in the feed to the aeration tanks. Adjustments are suggested to improve the denitrification rate. At the Bergambacht wastewater plant effluent concentrations of 6 - 7 mg/l total N and 0.3 mg/l total P were achieved.

Phosphorus, Nitrogen and Chlorophyll-A Concentrations in a Typical Dutch Polder Lake, Tjeukemeer, in Relation to its Water Regime Between 1968 and 1982

1985 ◽  
Vol 17 (4-5) ◽  
pp. 733-743 ◽  
Author(s):  
H. De Haan ◽  
J. R. Moed
Keyword(s):  
Chlorophyll A ◽  
Water Regime ◽  
Quality Standard ◽  
Summer Season ◽  
Total N ◽  
Chl A ◽  
Hydrological Data ◽  
Basic Quality ◽  
The Mean ◽  
Total P

The mean concentrations of total phosphorus (P) and total nitrogen (N) in the polder lake Tjeukemeer during the period April - September (summer season) between 1968 and 1982 were 0.215 and 3.8 mg/l, respectively. These values exceeded those laid down by the Dutch water authorities for standard water quality. Though the mean summer chlorophyll-a (chl-a) concentration of 116 µg/l during 1968 - 1982 was comparable with that for the basic quality standard, the mean concentrations between 1977 and 1982 were from 1.3 to 2.1 as high. Multiple regression analysis of the mean concentrations of total P and total N and climatological and hydrological data demonstrated that the P and N concentrations in Tjeukemeer in summer and in winter were significantly correlated with the deficit or surplus of water and consequently with the man-made regime, namely the inflow and outlet of water in SW Friesland. Between 1979 and 1982 the ratios (w/w) of the mean concentrations of total N and total P and those of particulate N and particulate P in summer were less than 16 and 10, respectively, indicating that phytoplankton growth was N rather than P limited.

Eutrophication and ecological rehabilitation of Dutch lakes: Presentation of a new conceptual framework

1995 ◽  
Vol 31 (8) ◽  
pp. 207-218 ◽  
Author(s):  
M. Klinge ◽  
M. P. Grimm ◽  
S. H. Hosper
Keyword(s):  
Conceptual Framework ◽  
Fish Consumption ◽  
Fish Population ◽  
Predator Control ◽  
Lake Productivity ◽  
Productivity Level ◽  
Ecological Rehabilitation ◽  
Cascading Effects ◽  
Piscivorous Fish ◽  
Total P

Lake restoration is a major issue in water management in The Netherlands. In this context biomanipulation is considered an important tool following the reduction of the nutrient load. Here we present a new conceptual framework and try to quantify the productivity level below which predator control of the fish population, which is considered a prerequisite for successful biomanipulation, occurs. The conceptual framework focuses on a balance between preyfish production and piscivorous fish consumption. When the piscivorous fish consumption (top-down control) is too low to control the preyfish community (bottom-up forces), the abundance of small planktivorous fishes will increase, leading to the cascading effects of a heavy predation on zooplankton and an excessive development of algae resulting in an increase of turbidity. With the framework the total-P concentrations characterising lake productivity at such turning points can be calculated. The framework is used to explain the eutrophication process of Dutch lakes, which is described as a series of stages between which shifts in community structure including the dominant piscivorous fish species occurred. Furthermore, based on the framework some predictions and methods for ecological rehabilitation will be presented.

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