Eutrophication and Restoration of Shallow Lakes from a Cold Temperate to a Warm Mediterranean and a (Sub)Tropical Climate

Beklioğlu, Meryem; Meerfhoff, Mariana; Søndergaard, Martin

doi:10.1007/978-90-481-9625-8_4

Cited by 37 publications

(38 citation statements)

References 107 publications

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“…In terms of phosphorus concentrations, this fits well with critical concentrations as reviewed by Beklioglu et al (2011) for north temperate shallow lakes (mainly North America and Europe): 0.025 (clarification) and 0.15 (turbidification) mg TP l -1 , of which the upper limit can be much higher if N is a limiting nutrient.…”

Section: Assessment Of P Loadingsupporting

confidence: 85%

“…The maximum colonization depth can be estimated with Secchi depth (Canfield et al 1985;Cooke et al 2005;Hudon et al 2000), chlorophyll a (Trolle et al 2008), extinction coefficient (Hudon et al 2000) or relative surface irradiation (Lacoul and Freedman 2006). Or the zooplankton-tophytoplankton ratio, indicating whether zooplankton is counterbalancing phytoplankton (Mehner et al Beklioglu et al 2011). Or the zooplankton size distribution, which indicates a fish community structure based on the fact that planktivorous fish are sizeselective feeders with a clear preference for larger zooplankton prey (Benndorf 1990(Benndorf , 2005.…”

Section: Ecological Targetsmentioning

confidence: 99%

“…1), a most essential distinction to make is lake depth. Here, shallow (polymictic) lakes are defined as having a mean depth of\3 m, based on lakes that can be largely colonized by macrophytes and that do not stratify for long periods in summer (Scheffer 2004;Burks et al 2006;Beklioglu et al 2011). Deep (monomictic or dimictic) lakes are defined as having a mean depth of [10 m, based on the lake's incompletely mixed area compared to the total lake area (Sas 1989).…”

Section: Shallow Versus Deep Lakesmentioning

confidence: 99%

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How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

Stroom

Kardinaal

2016

Aquat Ecol

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Water managers worldwide are facing the serious problem of dense blooms of cyanobacteria in surface waters. In the quest for the optimal method to combat cyanobacterial dominance, many questions and many possible solutions arise. This paper presents a three-phase strategy to fight harmful cyanobacterial proliferation. Water managers who apply this strategy can generate a tailor-made set of measures. The three phases consist of (1) defining the ecological water quality targets of the waterbody in question, (2) assessing its current ecological state, and (3) selecting which measures will yield optimal results. The paper provides assistance in the quantitative diagnosis of the state of both shallow and deep temperate freshwater lakes by means of a lake system analysis, and presents a survey of measures. Measures are divided into two sets. Preventive measures are based on switching to a clear state (shallow lake) or reducing the overall cyanobacterial biomass (deep lake). They are subdivided into nutrient reduction, hydromorphological adjustments, and food web management. Concerning nutrient reduction, in many situations phosphorus management alone should suffice. Nitrogen management can be important to increase the species diversity of macrophytes, or to relieve downstream (marine) consequences. Control measures (including mitigation) have a direct impact on cyanobacterial blooms by biomass removal, flushing, or mixing; however, the number of proven technologies is limited.

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Section: Assessment Of P Loadingsupporting

confidence: 85%

Section: Ecological Targetsmentioning

confidence: 99%

Section: Shallow Versus Deep Lakesmentioning

confidence: 99%

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How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

Stroom

Kardinaal

2016

Aquat Ecol

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“…(Romo et al, 2013). Prolonged hydraulic residence times resulting from drought also enhance salinization (Beklioglu et al, 2007;Beklioglu et al, 2011). Increased salinity not only favours cyanobacteria blooms (Sellner et al, 1988) but may also cause a ionic imbalance in saltsensitive taxa, resulting in ion toxicity and osmotic stress accompanied by high mortality or lower reproduction and growth rates (Nielsen et al, 2003;Jeppesen et al, 2007;Bezirci et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

et al. 2015

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According to the Intergovernmental Panel on Climate Change report released in September 2014, unprecedented changes in temperature and precipitation patterns have been recorded globally in recent decades and further change is predicted to occur in the near future, mainly as the result of human activity. In particular, projections show that the Mediterranean climate zone will be markedly affected with significant implications for lake water levels and salinity. This may be exacerbated by increased demands for irrigation water. Based on long-term data from seven lakes and reservoirs covering a geographical gradient of 52°of latitudes and a literature review, we discuss how changes in water level and salinity related to climate change and water abstraction affect the ecosystem structure, function, biodiversity and ecological state of lakes and reservoirs. We discuss mitigation measures to counteract the negative effects on ecological status that are likely to result from changes in climate and water abstraction practices. Finally, we highlight research required to improve knowledge of the impacts of anthropogenically induced changes on lake water level and consequent changes in salinity.

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“…Specifically, the gradual enrichment of surface water with plant nutrients, mainly nitrogen and phosphorus, has resulted in shifts from systems dominated by rooted aquatic plants to systems that are dominated by algae suspended in the water column [3,4]. Moreover, long water residence times, due to operational procedures applied to reservoirs, encourage internal nutrient release and, thus, cause regulated river waters to suffer from eutrophication [5,6].…”

Section: Introductionmentioning

confidence: 99%

200 kHz Sonication of Mixed-Algae Suspension from a Eutrophic Lake: The Effect on the Caution vs. Outbreak Bloom Alert Levels

Tekile

Kim

Lee

2017

Water

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For effective ultrasonic algae removal, several studies have considered the ultrasound equipment linked factors, such as power and frequency. However, studies on the response of mixed algal cultures and associated water quality parameters to ultrasound are limited. In this lab-scale sonication, the removal of cyanobacteria at a pre-set frequency of 200 kHz on mixed algae suspensions collected from a eutrophic lake was investigated. The caution (17.5 µg/L) and outbreak (1450 µg/L) alert levels in terms of chlorophyll-a (Chl-a) concentrations of the initial samples were each sonicated for 10, 15, and 20 min, and then kept in an incubator. Fifteen minutes of sonication resulted in best removal efficiency of 0.94 and 0.77, at an ultrasonic dose of 30 kWh/m 3 at the outbreak and caution level concentrations, respectively. Immediately after 15 min sonication, and after standing in the incubator for a day, chlorophyll-a removal efficiencies of 0.28 and 0.90 were achieved in the outbreak level, respectively, and the matching removal efficiencies for the caution level were 0.23 and 0.64. Even though the removal was substantial in both cases, the final 147 µg/L chlorophyll-a concentration of the outbreak, which is itself still in the outbreak level range, shows that ultrasonication is not effective to satisfactorily remove algae from a concentrated suspension. Total dissolved nitrogen and chemical oxygen demand were reduced, overall, due to sonication. However, total dissolved phosphorus of the concentrated level was increased during the treatment. Although sonication needs further replicated experimental testing in whole-lake systems, our results show that 200 kHz sonication was able to reduce chlorophyll-a concentrations in small-scale laboratory tests.

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Eutrophication and Restoration of Shallow Lakes from a Cold Temperate to a Warm Mediterranean and a (Sub)Tropical Climate

Cited by 37 publications

References 107 publications

How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

200 kHz Sonication of Mixed-Algae Suspension from a Eutrophic Lake: The Effect on the Caution vs. Outbreak Bloom Alert Levels

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