Stable states, buffers and switches: an ecosystem approach to the restoration and management of shallow lakes in the Netherlands

1998 ◽  
Vol 37 (3) ◽  
pp. 151-164 ◽  
Author(s):  
S. Harry Hosper
Keyword(s):  
The Netherlands ◽  
Lake Restoration ◽  
Nutrient Loading ◽  
Ecosystem Approach ◽  
Point Sources ◽  
Stable States ◽  
Lake Ecosystems ◽  
P Release ◽  
Water State ◽  
External P Loading

Lake restoration in the Netherlands has been focused mainly on the control of external P loading from point sources. However, this approach did not result in the water quality desired. The algae-dominated turbid water state may be extremely stable, and then additional measures are necessary to remove certain ‘blockages’ such as: the persistent bloom of Oscillatoria algae, the P release from the lake sediments, and the abundance of fish, preventing zooplankton and submerged macrophytes from developing. This paper addresses: (1) the need for an ecosystem approach, (2) the resistance of shallow lake ecosystems to changes in nutrient loading, (3) the concept of stable states, buffers and switches, and (4) the perspectives for lake restoration in the Netherlands. Priority should be given to fighting the Oscillatoria blooms. Winter flushing with water low in TP and algae proved to be an effective tool for reducing these blooms. Reduction of planktivorous fish, such as bream and roach, could enhance the top-down control of algae through the grazing by zooplankton, particularly by the large Daphnia species.

Suggestions for a Modified Approach Towards Implementation and Assessment of Ganga Action Plan and Other Similar River Action Plans in India

2003 ◽  
Vol 38 (4) ◽  
pp. 607-626 ◽  
Author(s):  
Vinod Tare ◽  
Purnendu Bose ◽  
Santosh K. Gupta
Keyword(s):  
Water Quality ◽  
River Water ◽  
Public Perception ◽  
Nutrient Loading ◽  
Action Plan ◽  
Public Support ◽  
Uttar Pradesh ◽  
River Water Quality ◽  
Point Sources ◽  
Action Plans

Abstract In India, the implementation of river-cleaning operations through River Action Plans (RAPs) conventionally focuses on a reduction in concentrated or point sources of organic loading to the river, and is assessed by monitoring the consequent improvement in river water quality. However, in the case of Indian rivers or river stretches having substantial background pollution due to distributed or non-point loading of organic matter and nutrients, elimination of point sources of pollution may not substantially impact or improve river water quality. It is suggested that implementation of River Action Plans in India under such circumstances must be conducted using a multi-tier approach. The initial emphasis in such cases should be on the selection of priority stretches of the river, where pollution control will have maximum beneficial impact on the citizens, and interception and diversion of all concentrated or point loads of pollution from these stretches. In addition, measures to minimize non-point pollution and visible pollution to the river and initiation of riverfront restoration and development projects are necessary in these priority stretches. Such measures would result in aesthetic improvements, increase the beneficial uses of the river and its surroundings, and generate favorable public perception towards RAPs, though they may not be sufficient to enhance the river water quality to the desired levels. However, as a result of the above actions, public support for funding more expensive and longer-term river cleaning schemes, resulting in comprehensive reduction in organic and nutrient loading to the river from point and non-point sources all along its length, may be generated. The need for this alternative methodology for implementation and assessment of RAPs in India has been illustrated by taking the example of the Ganga Action Plan (GAP) and assessment of its implementation near the city of Kanpur in the state of Uttar Pradesh, India, as a test case.

Reducing Nutrient Loading from Agriculture to Lake Ecosystems – Contributions of Resilience Principles

2020 ◽  
pp. 91-111
Author(s):  
Kate H. Reilly ◽  
Elena M. Bennett ◽  
Jan F. Adamowski ◽  
Gordon M. Hickey
Keyword(s):  
Nutrient Loading ◽  
Lake Ecosystems

Contribution of Solar Radiation to the Long-Term Dynamics of Hydro-Ecological Parameters of Lake Ecosystems under Variable Nutrient Loading: Case Study on Naroch Lakes

2021 ◽  
Vol 14 (1) ◽  
pp. 11-19
Author(s):  
T. I. Kazantseva ◽  
B. V. Adamovich ◽  
T. M. Mikheeva ◽  
T. V. Zhukova ◽  
R. Z. Kovalevskaya ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Nutrient Loading ◽  
Lake Ecosystems ◽  
Loading Case ◽  
Ecological Parameters

scholarly journals Exploring How Cyanobacterial Traits Affect Nutrient Loading Thresholds in Shallow Lakes: A Modelling Approach

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2467 ◽  
Author(s):  
Manqi Chang ◽  
Sven Teurlincx ◽  
Jan Janse ◽  
Hans Paerl ◽  
Wolf Mooij ◽  
...  
Keyword(s):  
Water Quality ◽  
Nitrogen Fixation ◽  
Shallow Lakes ◽  
Lake Restoration ◽  
Nutrient Loading ◽  
Ecosystem Model ◽  
Water Bodies ◽  
Cyanobacterial Blooms ◽  
Eutrophic Water ◽  
Modelling Approach

Globally, many shallow lakes have shifted from a clear macrophyte-dominated state to a turbid phytoplankton-dominated state due to eutrophication. Such shifts are often accompanied by toxic cyanobacterial blooms, with specialized traits including buoyancy regulation and nitrogen fixation. Previous work has focused on how these traits contribute to cyanobacterial competitiveness. Yet, little is known on how these traits affect the value of nutrient loading thresholds of shallow lakes. These thresholds are defined as the nutrient loading at which lakes shift water quality state. Here, we used a modelling approach to estimate the effects of traits on nutrient loading thresholds. We incorporated cyanobacterial traits in the process-based ecosystem model PCLake+, known for its ability to determine nutrient loading thresholds. Four scenarios were simulated, including cyanobacteria without traits, with buoyancy regulation, with nitrogen fixation, and with both traits. Nutrient loading thresholds were obtained under N-limited, P-limited, and colimited conditions. Results show that cyanobacterial traits can impede lake restoration actions aimed at removing cyanobacterial blooms via nutrient loading reduction. However, these traits hardly affect the nutrient loading thresholds for clear lakes experiencing eutrophication. Our results provide references for nutrient loading thresholds and draw attention to cyanobacterial traits during the remediation of eutrophic water bodies.

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.

Habitat Modelling of Rivers and Lakes in the Netherlands: An Ecosystem Approach

2003 ◽  
Vol 28 (2) ◽  
pp. 231-247 ◽  
Author(s):  
Harm Duel ◽  
Guda E.M. van der Lee ◽  
W. Ellis Penning ◽  
Martin J. Baptist
Keyword(s):  
The Netherlands ◽  
Ecosystem Approach ◽  
Habitat Modelling ◽  
Rivers And Lakes
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