Relevant bibliographies by topics / Eutrophication. Lake restoration

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Academic literature on the topic 'Eutrophication. Lake restoration'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Eutrophication. Lake restoration"

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Tay, Chai Jian, Su Yean Teh, and Hock Lye Koh. "Eutrophication Bifurcation Analysis for Tasik Harapan Restoration." International Journal of Environmental Science and Development 11, no. 8 (2020): 407–13. http://dx.doi.org/10.18178/ijesd.2020.11.8.1282.

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Regime shift is characterized by large, abrupt and persistent changes in ecosystem structure and dynamics. Bifurcation analysis is commonly used to identify regime shift equilibrium states and to distinguish their stability characteristics. Eutrophication in lake, a regime shift from clear-water oligotrophic state, is a stable equilibrium state that can persist for long duration. Characterized by undesirable turbid water condition, eutrophication has been known to impair valuable ecosystem services provided by lakes worldwide. The high incidence of eutrophication in Malaysian lakes (62%) mandates urgent need for lake restoration. The three-fold objectives of this paper are (1) to develop a mathematical model for analysing bifurcation criteria in regime shift, (2) to identify regime shift thresholds and (3) to propose effective ecosystem management strategy for shallow tropical lakes such as Tasik Harapan. A mathematical model consisting of four compartments: algae, phosphorus, dissolved oxygen and biochemical oxygen demand is formulated to analyse the eutrophication dynamics in the highly eutrophic Tasik Harapan (TH), a small shallow lake in Universiti Sains Malaysia (USM). Bifurcation analysis is performed by means of XPPAUT to identify the regime shift thresholds and to determine the type of lake response. Identified as irreversible, the eutrophication state of TH mandates an urgent lake restoration program to remove nutrients in the lake. Two restoration methods for reducing nutrients are assessed: (1) flushing of lake water and (2) hypothetical application of the invasive water hyacinth. Bifurcation analysis indicates that a flushing rate exceeding 0.042 day-1 is needed to restore TH to oligotrophic state. A complicated strategy of water hyacinth application would reduce the algae concentration from 300 μg/l to 120 μg/l after 9.6 years. A severe shortfall is the complicated and uncertain process of frequent removal of water hyacinth to prevent the lake from being overwhelmed by the invasive plants. The feasibility and sustainability of these two lake restoration methods are discussed. The insights gained would be useful to the relevant authorities in determining and implementing the best remediation measures for TH.
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Zhu, Konghao, Yao Wu, Chunhua Li, Jun Xu, and Min Zhang. "Ecosystem-Based Restoration to Mitigate Eutrophication: A Case Study in a Shallow Lake." Water 12, no. 8 (2020): 2141. http://dx.doi.org/10.3390/w12082141.

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Under the influence of human activities, eutrophication has become an increasingly serious global phenomenon, especially in shallow lakes. Many studies have shown that aquatic macrophytes play a significant role in controlling eutrophication, but only few of these studies are ecosystem based. In this paper, we applied a mass-balance ecosystem model to a shallow eutrophic lake (Lake Datong, China) as a case study with the aims of evaluating the status of ecosystem restoration via the recovery of aquatic vegetation and providing adaptive management suggestions. Results showed that the ecosystem was immature with weak energy flows and nutrient cycling largely due to the excessive submerged macrophytes and the lack of fish as consumer. In the early stages of restoration, the number of fish should be reduced, and aquatic vegetation needs to be recovered to mitigate eutrophication. When the aquatic vegetation community tends to be stable, herbivorous and omnivorous fish should be moderately stocked, and dead aquatic macrophytes should be harvested to maintain the healthy and sustainable development of the ecosystem. This study provided insights for the ecological restoration of shallow eutrophic lakes and revealed the urgent need for ecosystem-based restoration.
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Binhe, GU. "Eutrophication and Restoration of Lake Apopka, USA." Journal of Lake Sciences 17, no. 1 (2005): l—8. http://dx.doi.org/10.18307/2005.0101.

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Bozic, M., G. Nikolic, Z. Rudic, V. Raicevic, and B. Lalevic. "Constructed wetlands as an alternative restoration measure for shallow lakes." Water Science and Technology 68, no. 7 (2013): 1672–78. http://dx.doi.org/10.2166/wst.2013.412.

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This paper deals with the consequences of cultural eutrophication and unconventional solutions for shallow lake restoration. Cultural eutrophication is the primary problem that affects especially shallow lakes, due to their physical characteristics (e.g. shallow depth, lack of stratification). Palic Lake, a very shallow Pannonian lake, received treated municipal wastewaters coming from the lagoons of a wastewater treatment plant. The sewage discharge mainly increased the nutrient load to the lake in the last decades. The lake sustainability is affected by inappropriate quality of water that flows into the lake, and abundance of deposited sediment. The technology that can provide both improvement of water quality and resolution of the sediment problem is a constructed wetland, which is designed to utilise the natural processes involving wetland vegetation, soil and their associated microbial assemblages to assist in additional water treatment. The technical solution is based on three key aspects: quality and quantity of deposited sediment, enriched by nutrients; effluent quality; desired lake water quality. A designed constructed wetland can accomplish the desired water quality and gradually remediate deposited sediment.
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Su, Wei, Jiapeng Wu, Bei Zhu, Kaiqi Chen, Wenqi Peng, and Baoyue Hu. "Health Evaluation and Risk Factor Identification of Urban Lakes—A Case Study of Lianshi Lake." Water 12, no. 5 (2020): 1428. http://dx.doi.org/10.3390/w12051428.

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Health assessment and risk factor identification represent the premise and foundation of scientific management and ecological restoration of urban lakes. Based on in-depth understanding of the nature–society duality of urban lakes, a framework for evaluating urban lake health was constructed, including four modules, namely, establishing an index system; determining the index weight; identifying risk factors; and a comprehensive lake health evaluation. Employing this framework, we evaluated Lianshi Lake, Beijing, classifying the lake condition as “sub-healthy”. Based on the evaluation data, we identified the health risk factors of the lake. We applied standard difference rate (SDR) and risk degree (Rd) (safe degree (Sd)) concepts, and classified the indices of risk areas employing the Pareto analysis method. Finally, we identified the lake residence period, landscape connectivity, and eutrophication as the major risk factors in Lianshi Lake. Three factors constitute the basis of ecosystem health and are key targets of ecological restoration: the lake residence period represents the hydrological and hydrodynamic characteristics of the lake; landscape connectivity is described from an ecological perspective, and represents the integrity of the lake ecosystem; and the eutrophication states describe the water quality characteristics and represent the availability of lake water. The results contribute to decision-making for comprehensive urban lake management.
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Nazarova, T. V., K. M. Dzhanaleeva, G. J. Baryshnikov, P. S. Dmitriev, and Zh I. Inkarova. "Anthropogenic eutrophication and ways of lake systems restoration in northern Kazakhstan." BULLETIN of the L.N. Gumilyov Eurasian National University. Chemistry. Geography. Ecology Series 130, no. 1 (2020): 120–32. http://dx.doi.org/10.32523/2616-6771-2020-130-1-120-132.

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The article is concerned with the processes of eutrophication of lake systems in Northern Kazakhstan. A comprehensive assessment of the current state of the ecosystem of the Zhamanovskoe Lake was carried out. The main reasons for the eutrophication of the Zhamanovskoe Lake have been identified: plowing of the catchment area, use of pesticides, cattle grazing and watering. Activities on land reclamation were developed. The Zhamanovskoe Lake is a typical reservoir of Northern Kazakhstan in terms of size, water receiving, origin of the lake basin, etc. Research undertaken can be applied to more water bodies.
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Janse, J. H., W. Ligtvoet, S. Van Tol, and A. H. M. Bresser. "A Model Study on the Role of Wetland Zones in Lake Eutrophication and Restoration." Scientific World JOURNAL 1 (2001): 605–14. http://dx.doi.org/10.1100/tsw.2001.350.

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Shallow lakes respond in different ways to changes in nutrient loading (nitrogen, phosphorus). These lakes may be in two different states: turbid, dominated by phytoplankton, and clear, dominated by submerged macrophytes. Both states are self-stabilizing; a shift from turbid to clear occurs at much lower nutrient loading than a shift in the opposite direction. These critical loading levels vary among lakes and are dependent on morphological, biological, and lake management factors. This paper focuses on the role of wetland zones. Several processes are important: transport and settling of suspended solids, denitrification, nutrient uptake by marsh vegetation (increasing nutrient retention), and improvement of habitat conditions for predatory fish. A conceptual model of a lake with surrounding reed marsh was made, including these relations. The lake-part of this model consists of an existing lake model named PCLake[1]. The relative area of lake and marsh can be varied. Model calculations revealed that nutrient concentrations are lowered by the presence of a marsh area, and that the critical loading level for a shift to clear water is increased. This happens only if the mixing rate of the lake and marsh water is adequate. In general, the relative marsh area should be quite large in order to have a substantial effect. Export of nutrients can be enhanced by harvesting of reed vegetation. Optimal predatory fish stock contributes to water quality improvement, but only if combined with favourable loading and physical conditions. Within limits, the presence of a wetland zone around lakes may thus increase the ability of lakes to cope with nutrients and enhance restoration. Validation of the conclusions in real lakes is recommended, a task hampered by the fact that, in the Netherlands, many wetland zones have disappeared in the past.
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Reavie, Euan D., John P. Smol, and N. Bruce Carmichael. "Postsettlement eutrophication histories of six British Columbia (Canada) lakes." Canadian Journal of Fisheries and Aquatic Sciences 52, no. 11 (1995): 2388–401. http://dx.doi.org/10.1139/f95-831.

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Eutrophication is a serious problem in many British Columbia lakes. However, long-term nutrient data are rare or unavailable for most lake systems, so the natural, predisturbance characteristics of lakes are unknown, as are the trajectories of past environmental change. We used paleolimnological analyses of diatoms to quantitatively assess eutrophication trends for approximately the last 150 years in six British Columbia lakes. A transfer function was used to infer past lake-water total phosphorus concentrations from the sedimentary diatom assemblages in 210Pb-dated sediment cores: all of the lakes had relatively high total phosphorus levels (> 13 μg/L) prior to European settlement. Three of the lakes showed significant eutrophication since that time, whereas the others were only mildly affected. Total phosphorus inferences using the transfer function satisfactorily estimated the modern total phosphorus concentrations of our six study lakes. Minor quantitative problems arose when some fossil assemblages provided poor analogues to the calibration function, but eutrophication trends were still clearly apparent. Our results confirm that some British Columbia lakes have suffered considerable eutrophication as a result of anthropogenically related nutrient inputs, while others, although situated within human-influenced regions, have been relatively unaffected. These results can now be used to help set realistic goals for restoration projects.
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Joensuu, I., and M. Pekkarinen. "Cultural eutrophication, restoration and management of Lake Tuusulanjärvi, Finland." SIL Proceedings, 1922-2010 29, no. 5 (2006): 2197–200. http://dx.doi.org/10.1080/03680770.2006.11903081.

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Lau, S. S. S., and S. N. Lane. "Continuity and change in environmental systems: the case of shallow lake ecosystems." Progress in Physical Geography: Earth and Environment 25, no. 2 (2001): 178–202. http://dx.doi.org/10.1177/030913330102500202.

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Traditional ideas concerning environmental management tend to be based upon simple relationships between cause and effect. Such approaches make the design of environmental management strategies fairly straightforward: once the cause of a problem has been identified, it is necessary only to address the cause and/or help the system to recover through some sort of attempt at restoration. In the case of shallow lake eutrophication, research in the 1960s and 1970s identified phosphorus as the key control on the trophic state of a lake and, hence, recommended reductions in the supply of phosphorus to lakes as the necessary remedial measure. However, subsequent research has illustrated that such measures were not always successful. This article reviews the science of shallow lake eutrophication to demonstrate the role of ecosystem-specific biological and chemical interactions in conditioning the response of lakes to remedial measures and, hence, shows how new ideas of complexity help us to understand the behaviour of lake ecosystems so that we can develop alternative environmental management strategies.
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Dissertations / Theses on the topic "Eutrophication. Lake restoration"

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Balangoda, Anusha. "Impact of Artificial Aeration on Nutrients in Small Eutrophic Lakes." Diss., North Dakota State University, 2014. http://hdl.handle.net/10365/24669.

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Cairns, Stefan H. 1949. "Eutrophication Monitoring and Prediction." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc277850/.

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Changes in trophic status are often related to increases or decreases in the allocthonous inputs of nutrients from changes in land use and management practices. Lake and reservoir managers are continually faced with the questions of what to monitor, how to monitor it, and how much change is necessary to be considered significant. This study is a compilation of four manuscripts, addressing one of these questions, using data from six reservoirs in Texas.
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Brännström, Klara. "Övergödningen av Uttersjöträsket : Åtgärdsförslag baserade på data från Skellefteå kommun och egna vattenprovtagningar." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123300.

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Eutrophication is a global environmental problem, which in Sweden is predominantly in the south of Sweden where there are large agricultural areas. Skellefteå is a small town on the northern coast which has eleven water bodies classified as “poor ecological status” of which Uttersjöträsket is one of them according to the water authorities. Uttersjöträsket has a requirement to achieve good ecological status by 2021. Uttersjöträsket’s agriculture land is from at least 1716 according to historical maps. To be able to restore a eutrophic lake the source of the phosphorus load must be identified.To determine the natural state for Uttersjöträsket the sediment record could be studied. For example, earlier studies have been made in Kassjön in Umeå were they conclude that the beginning of the agriculture area started in the 12th century, which means that Uttersjöträsket could have had agriculture land since before 1716. The municipality of Skellefteå made contact with residents in the area who formed a water group to work towards achieving the goal by 2021. This report will form the basis for the water group to take appropriate measures to reduce the bloom of cyanobacteria and to achieve good ecological status. The conclusions of this report are based on analysis of data and results from previous studies of eutrophic lakes. Many different methods must be done to have a long-lasting impact and to achieve good ecological status in Uttersjöträsket. The focus of the actions should be on the ditch between Yttersjön and Uttersjöträsket as the highest phosphorus load is in that catchment.
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White, Arthur J. "A 1982 restoration feasibility study of Lakes of the Four Seasons in Northwestern Indiana." Virtual Press, 1985. http://liblink.bsu.edu/uhtbin/catkey/426076.

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The Lakes of the Four Seasons, a community in Lake and Porter Counties in northwestern Indiana, contains highly eutrophic lakes. A diagnostic feasibility study of the lakes was initiated in December 1981, and continued through November 1982. Morphometric, limnological and hydrologic characteristics of the lakes were defined in order to permit the development of nutrient and hydrologic budgets for the lakes. In addition to the development of these budgets, preliminary testing of a lake restoration technique, phosphorus precipitation, was performed. These studies and the resultant budgets provided necessary information for the formulation of feasible restoration methods for the lakes. The recommended restoration methods, if implemented, could enhance and maintain water quality conducive to recreational use and aesthetic enjoyment.The Lakes of the Four Seasons system has a mass water loading of 3.596 x 106 m3 Y-1and a hydraulic residence time of 0.71 y. Mass external phosphorus loading to the lakes is 537.34 kg –1 . Mass nitrogen loading to the system is 13,457 kg y -l.Big Bass Lake has a mass water loading of 2.316 x 106 m3 y-1 and a hydraulic residence time of 0.16 y. Mass external phosphorus loading to the lake is 356.76 kg y -l. Mass nitrogen loading to Big Bass Lake is 12,260 kg y -l.Lake Holiday/Lake on the Green has a mass water loading of 3.423 x 106 m3 y 1 and a hydraulic residence time of 0.65 y. Mass external phosphorus loading to the lakes is 330.52 kg y-1. Mass nitrogen loading to the Lake Holiday/Lake on the Green is 11,980 kg y1.Both loading and in-lake nitrogen:phosphorus ratios indicated phosphorus limitation in these lakes. The eutrophic condition of the lakes was also indicated by in-lake nutrient concentrations as well as excessive algal and macrophyte growth. Rapid 02 depletion, which occurs in water overlying the sediments even though the lakes are fairly well mixed, also testifies to the extreme productivity of the lakes.Restoration options for these lakes include short term cosmetic methods, longer term options for the disruption of internal phosphorus cycling, and abatement of phosphorus loading from the watershed. The cosmetic options involve the use of herbicides and algicides to give immediate relief from excessive primary productivity. Dredging and drawdown/sediment consolidation are aired at reducing internal phosphorus loading, while methods directed at the abatement of phosphorus loading from the watershed attack the cause of the lake system's problems. The longer term options necessitate further studies before implementation.
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Bakker, Cleo. "Nutrients and biota in a lake system before and after restoration; a data analysis of the Swedish eutrophication case study Växjösjön." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445066.

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Eutrophication has proven to be a fundamental ecological problem for lakes and other bodies of water all around the world. The process of eutrophication can be defined as a lake containing increasing concentrations of nutrients from external and/or internal input over time. The increase of nutrients in the lake has several consequences for the lake ecosystem, such as the increase in algal blooms (sometimes containing toxic and harmful cyanobacteria) and the decrease of macrophytes. One nutrient that plays a key role in the eutrophication process is phosphorus. To restore eutrophic waters, the external and internal input of phosphorus needs to be reduced. External input can be decreased by reducing the run-off from industrial areas or agriculture. Internal input can be reduced by disrupting the in-lake phosphorus loading processes, which are connected heavily to the lake sediment. The internal phosphorus loading processes can be caused by several different processes. One is the mineralization of organic biomass on the sediment which releases phosphorus into the water, another is the release of previously iron-bound phosphorus from the sediment. Different treatments can be implemented in a lake system to disrupt these internal processes of phosphorus loading and consequently restore the water quality of the lake. Such treatments also influence the biota of the lake and the ecosystem services, because of their effect on water quality. Biomanipulation treatments and aluminum treatments were implemented in lake Växjösjön in Sweden to restore the lake to a more natural and balanced state. Both treatments were effective in reducing the eutrophic conditions of the lake, improving water quality, biota, and the ecosystem services. Local human populations benefit from these improvements, for example by receiving increased revenue from lake recreation. More research is however needed to discern the long-term effects of the treatments in the Växjö municipality, thereby aiding local government and policy makers in their future decisions regarding restoration.
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Morillo, Sebastian. "Engineering solutions to water quality problems in lakes." University of Western Australia. Centre for Water Research, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0153.

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Lake restoration and management strategies focus on reducing the negative impacts of enriched or polluted inflows. These strategies become of paramount importance when lakes are used for recreational and/or drinking water purposes. Long term control of eutrophication and turbidity problems associated with large inflow loads is usually oriented to catchment management. Although it has been suggested that this is the correct long term approach, public concerns usually require a short term solution. In addition, due to political and economic costs related to changes in catchment management, in-lake restoration technologies have been emerging as a viable pretreatment option, complementary to water treatment plants, both reducing the operational costs of the water treatment plant and ameliorating the water residing in the lakes. This research investigates the effects of two in-lake technologies on the dynamics of inflowing rivers, where basin shape plays a significant role. The three lakes in this study suffer from eutrophication combined with a distinctive water quality problem: from turbidity in Silvan Reservoir (Australia), to heavy metal loads in Coeur d'Alene Lake (USA) and industrial wastes in Lake Como (Italy). Firstly, the influence of basin morphology, wind speed, and wind direction on the fate and transport of two rivers flowing into the L-shaped Coeur d'Alene Lake was examined, and it was shown that transport and mixing patterns in a lake can be greatly influenced by the shape of the lake, leading to important consequences for the plankton ecology in the lake. Secondly, in Silvan Reservoir we investigated the potential to modify the basin shape using vertical barriers, increasing the retention time and hence the barrier capacity to microbial pollution. A final in-lake technology was tested for Lake Como, using a downward pointing impeller to remove polluted water from the coastal margin. Lessons from these three examples indicate that there is significant potential for in-lake remediation at relatively low cost, over relatively short timescales.
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Miranda, Marcela Aparecida Campos Neves. "Medidas de mitigação para controle e manejo das florações de cianobactérias em um sistema raso tropical." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6500.

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Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-03-27T11:30:41Z No. of bitstreams: 0<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-03-27T13:52:08Z (GMT) No. of bitstreams: 0<br>Made available in DSpace on 2018-03-27T13:52:08Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-06-30<br>Florações de cianobactérias são consequência principalmente da eutrofização de ambientes aquáticos que afeta a qualidade e compromete o uso da água para diversas finalidades. A restauração de sistemas aquáticos eutrofizados é um dos principais desafios da limnologia atual. Nosso objetivo foi identificar as principais causas do processo de eutrofização e ocorrência de florações de cianobactérias e testar a eficácia e aplicabilidade do uso combinado de coagulantes e adsorventes de P em fase sólida no controle da eutrofização e florações em um lago tropical raso. O estudo foi conduzido no lago do Museu Mariano Procópio, localizado em Juiz de Fora – MG e dividido em quatro fases. As duas primeiras fases compreendem uma análise sistêmica do lago. Na primeira, buscou-se conhecer a dinâmica da comunidade fitoplanctônica a fim de entender a dominância de cianobactéria deste sistema. Na segunda, foram avaliados os aportes de fósforo (P) para o sistema. Na terceira fase foram realizados experimentos em laboratório, para verificar a eficácia de diferentes coagulantes e lastros para remoção de cianobactérias. E na quarta fase foram realizados experimentos em mesocosmos no lago, para testar o controle da eutrofização e florações de cianobactérias. A análise sistêmica mostrou dominância de diferentes espécies de cianobactérias e que as altas concentrações de nutrientes presentes do sistema vêm principalmente de contribuição externa. O uso combinado de coagulantes e lastros foi eficiente para a remoção de biomassa de cianobactérias, porém foi dependente da espécie. Nos experimentos com mesocosmos, foi observada uma forte redução de Clorofila a (Chl a 85%) e fósforo total (TP 78%) (p <0,0010) em todos os tratamentos, porém estas reduções não se mantiveram ao longo do tempo. Para mitigar as florações de cianobactérias deste sistema, será necessário o controle das fontes externas de nutrientes e um ajuste na técnica de coagulante-lastro para manter a clorofila e o fósforo total em concentrações reduzidas por mais tempo.<br>Cyanobacterial Blooms are mainly a consequence of eutrophication of aquatic environments that affect the water quality and compromise the use of water for various purposes. The restoration of eutrophic aquatic systems is one of the main challenges of today's limnology. Our objective was to identify the main causes of the eutrophication process and the occurrence of cyanobacterial blooms in a shallow tropical lake, and to test the efficacy and applicability of the combined use of coagulants and adsorbents of P in solid phase for the control of eutrophication and cyanobacteria blooms in a tropical shallow system. The study was conducted in the lake of the Mariano Procópio Museum, located in Juiz de Fora - MG and divided into four phases. The first two phases comprised a systemic analysis of the lake. The first one sought to know the dynamics of the phytoplankton community and to understand the causes of the cyanobacteria dominance in this system. In the second one, the main contributions of phosphorus to the system and the general balance of P were evaluated. In the third phase, laboratory experiments were carried out to evaluate the efficacy of different coagulants and ballasts for the removal of cyanobacteria. Last, in the fourth phase experiments were carried out in mesocosmos in the lake to test the control of eutrophication and cyanobacterial blooms. The systemic analysis showed the dominance of different species of cyanobacteria and that the high concentrations of nutrients present in the system come mainly from external contribution. The combined use of coagulants and ballasts was efficient for the removal of cyanobacteria biomass, but it is dependent on the species pool. In the experiments with mesocosms, a strong reductions of chloropyll a (Chl a) 85% and total phosphorus (TP) 78% (p < 0.001) were observed in all treatments, however these reductions were not lasting. To mitigate the cyanobacterial blooms of this system, it will be necessary to control the external sources of nutrients and also an adjustment in the coagulant-ballast technique to keep Chl a l and TP in reduced concentrations for longer time.
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Ferreira, Tiago Finkler. "O papel das macrófitas submersas sobre a qualidade da água, restauração e conservaçao de lagos rasos subtropicais : estudo de caso, a Lagoa Mangueira, RS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/18978.

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O objetivo desta Tese foi avaliar o papel da macrófitas submersas em relação à qualidade da água, interações com o fitoplâncton e ciclagem biogeoquímica na Lagoa Mangueira, um grande lago raso subtropical, no sul do Brasil. Para alcançar estes objetivos, este trabalho conta com uma série de abordagens, como: levantamentos de campo, etapas experimentais e uso de modelos ecológicos para avaliar a influência de macrófitas sobre a dinâmica do ecossistema de estudo, cujas águas são intensamente exploradas para suprir a cultura de arroz em sua área de entorno. Ao longo de seus 200km de perímetro litorâneo, a Lagoa apresenta maciços estandes submersos de vegetação. A análise de qualidade da água e estrutura da comunidade fitoplanctônica ao longo de um gradiente de vegetação submersa, partindo da zona litorânea para a zona pelágica (sem vegetação), revelou menor disponilibidade de nutrientes como orto-fosfato (PO4) e menor concentração de clorofila-a (Clo-a), na área com vegetação submersa. Na zona pelágica, os maiores valores de Clo-a foram corroborados pela maior biomassa fitoplanctônica, sendo representada principalmente por espécies de cianobactérias. Tais evidências sugerem o efeito antagônico entre macrófitas e fitoplâncton, como a competição por nutrientes e alelopatia. Em laboratório, estes mecanismos puderam ser comprovados em experimentos de coexistência realizados em microcosmos com 4 espécies de macrófitas nativas e uma cepa da cianobactéria Microcystis aeruginosa. Os testes envolveram níveis distintos de intensidade luminosa e concentração de PO4 visando determinar limiares para a ocorrência de alelopatia. As espécies Cabomba caroliniana e Myriophyllum spicatum se demonstraram potencialmente alelopáticas enquanto que as espécies Ceratophyllum demersum e Egeria densa apresentaram elevada capacidade de absorção de PO4 (±0,35 mg.g-1d-1) reduzindo rapidamente a concentração deste nutriente a valores abaixo de 0,05 mg.L-1. Outra abordadem experimental foi conduzida para parametrizar a cinética da liberação de nutrientes e carbono de 5 espécies de macrófitas durante o processo de decomposição. Com o auxílio de modelos ecológicos, foi simulado o crescimento de macrófitas submersas em lagos subtropicais e temperados. Isto foi realizado visando avaliar a possibilidade de aumento da resilência do estado de dominância por macrófitas em lagos de baixa latidude devido ao crescimento contínuo da vegetação, ao contrário de lagos temperados, onde as plantas morrem sazonalmente em função do inverno rigoroso. Além disso, foram simulados cenários considerando a possibilidade de colapso da vegetação submersa na Lagoa Mangueira em função de intensa tomada da água da Lagoa para irrigação. Com base na modelagem, foi possível estimar limiares de eutrofização para a proliferação do fitoplâncton. Em suma, os resultados comprovaram os mecanismos de retroalimentação positiva de macrófitas submersas sobre a qualidade da água e importância de suas funções ecológicas para o estado trófico e gestão da Lagoa Mangueira. Além disso, este conjunto de informações constitui uma base teórico-prática para o manejo, restauração e conservação de lagos rasos subtropicais e tropicais.<br>The aim of this Thesis was to evaluate the role of the submerged macrophytes with respect to water quality and, interactions with phytoplankton and nutrient cycling in the large shallow subtropical Lake Mangueira, southern Brazil. To achieve these goals, this work counts with approaches in situ, in laboratory and aplication of ecological modelling to verifify the influence of the submerged vegetation over the dynamics of the ecosystem, whose water is intensively explored to irrigate rice crops around its surrounding area. Over the 200km of the lake littoral perimeter, several submerged macrophyte beds are established. The analysis of water quality and phytoplankton structure along a macrophyte-pelagic gradient revealed lower concentration of orto-phosphate (PO4) and chlorophyll-a (Chlo-a) in the vegetated area. At the pelagic zone, the higher Chlo-a values were corroborated by the higher biomass of phytoplankton, which was mostly composed by cyanobacteria species. Such evidences suggest the antagonistic relantionship between macrophytes and phytoplankton as nutrient competition and allelopathy. Experiments of coexistance, in microcosms, with 4 native submerged macrophytes and a toxic strain of the cyanobacteria Microcystis aeruginosa proved the occurrence of these mechanisms. The experiments included different levels of light intensity and orto-phosphate concentration (PO4) in the medium aiming to identify thresholds in which allelopathy is likely to occur. The macrophytes Cabomba caroliniana and Myriophyllum spicatum showed allelopathic potential while the species Ceratophyllum demersum and Egeria densa showed a high capacity for PO4 absorption (±0.35 mg.g-1d-1), being able to reduce this nutrient to lower levels than 0.05 mg.L-1. Another experimental approach was carried out to parameterize the leaching of nutrients and carbon from 5 macrophytes under decaying process. Moreover, ecological modelling was utilized to simulate the growth of submerged macrophytes in subtropical and temperate lakes. This was done aiming to evaluate the possibility of resilience enhancement of the clear water state in lakes of low latitude because the plants can grow continuously, in contrast with temperate lakes, where they die seasonally due to rigorous winter. In addition, simulation of scenarios considering the collapse of the vegetation in Lake Mangueira because of water uptake for rice crops were carried out in oder to provide elements for the ecosystem management. Through this approach, it was possible to forecast possible eutrophication thresholds for phytoplankton blomming. In conclusion, the results proved the the postive feed-back mechanisms exerted by the submerged macrophytes on the water quality and the importance of their ecological functions to the trophic state of Lake Mangueira. In addition, such information serve as theoretical and practical basis for the management, restoration and conservation of subtropical and tropical shallow lakes.
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Hopkins, Aareka. "The potential for charophtye re-establishment in large, shallow, eutrophic lakes with special reference to Lake Waikare, New Zealand /." 2006. http://adt.waikato.ac.nz/public/adt-uow20060717.162208/index.html.

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Reed-Anderson, Tara. "Flows of phosphorus on an agricultural landscape implications for eutrophication and restoration of Lake Mendota /." 1999. http://catalog.hathitrust.org/api/volumes/oclc/45275213.html.

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Books on the topic "Eutrophication. Lake restoration"

1

International Workshop on Restoration and Management of Eutrophic Lakes (2001 Kunming Shi, China). Restoration and management of tropical eutrophic lakes. Edited by Reddy M. V. Science Publishers, 2005.

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Haynes, Robert C. Section 314 phase II restoration project of Lake Lashaway. Massachusetts Dept. of Environmental Protection, Division of Water Pollution Control, Technical Services Branch, 1990.

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International ILEC Conference (5th 1993 Stresa, Italy). " Strategies for lake ecosystems beyond 2000": Selected papers. Edited by De Bernardi Riccardo, Pagnotta R, Pugnetti A, and International Lake Environment Committee. Consiglio Nazionale delle Ricerche, Istituto Italiano di Idrobiologia, 1993.

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Hosper, Harry. Clearing lakes: An ecosystem approach to the restoration and management of shallow lakes in the Netherlands. Ministry of Transport, Public Works, and Water Management, Institute for Inland Water Management and Waste Water Treatment, 1997.

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North American Lake Management Society. Conference. Lake and reservoir management: Practical applications : proceedings of the Fourth Annual Conference and International Symposium, October 16-19, 1984, McAfee, New Jersey. North American Lake Management Society, 1985.

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Anderson, Chauncey W. Pine Lake response to diversion of wetland phosphorus. Dept. of Civil Engineering, University of Washington, 1991.

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Berg, Marcel S. Van den. Charophyte colonization in shallow lakes: Processes, ecological effects and implications for lake management. RIZA, 1999.

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Alhonen, Pentti. Cultural eutrophication of Lake Lippajärvi in southern Finland and related restoration problems. Suomalainen Tiedeakatemia, 1986.

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Force, New Jersey Lake Restoration and Management Advisory Task. Public meeting of New Jersey Lake Restoration and Management Advisory Task Force: [September 27, 2001, Mt. Arlington, New Jersey]. The Unit, 2001.

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Force, New Jersey Lake Restoration and Management Advisory Task. Public meeting of New Jersey Lake Restoration and Management Advisory Task Force: To assess the quality of New Jersey's lakes. The Unit, 2001.

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Book chapters on the topic "Eutrophication. Lake restoration"

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Vantarakis, Apostolos. "Eutrophication and Public Health." In Chemical Lake Restoration. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76380-0_2.

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Kapsalis, Vasileios C., and Ioannis K. Kalavrouziotis. "Eutrophication—A Worldwide Water Quality Issue." In Chemical Lake Restoration. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76380-0_1.

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Dokulil, Martin T., Karl Donabaum, and Karin Pall. "Successful Restoration of a Shallow Lake: A Case Study Based on Bistable Theory." In Eutrophication: causes, consequences and control. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9625-8_14.

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Kroes, H. W. "The significance of the Loosdrecht lakes research project for eutrophication policy in The Netherlands." In Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in The Netherlands. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2432-4_14.

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Verstraelen, P. J. T., J. Wisserhof, Lj Rodić, and R. Eijsink. "Eutrophication control strategies for three shallow Vecht lakes in the province of North Holland." In Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in The Netherlands. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2432-4_22.

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Van Huet, Harry J. W. J. "Phosphorus eutrophication in the SW Frisian lake district 2. Phosphorus balances and simulation of reduction scenarios." In Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in The Netherlands. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2432-4_25.

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Van Huet, Harry J. W. J. "Phosphorus eutrophication in the SW Frisian lake district 1. Monitoring and assessment of a dynamic mass balance model." In Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in The Netherlands. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2432-4_24.

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Harper, David. "A case study in restoration: shallow eutrophic lakes in the Norfolk Broads." In Eutrophication of Freshwaters. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-3082-0_8.

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Beklioglu, Meryem, Mariana Meerfhoff, Martin Søndergaard, and Erik Jeppesen. "Eutrophication and Restoration of Shallow Lakes from a Cold Temperate to a Warm Mediterranean and a (Sub)Tropical Climate." In Eutrophication: causes, consequences and control. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9625-8_4.

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Gulati, Ramesh D., and Ellen van Donk. "Lakes in the Netherlands, their origin, eutrophication and restoration: state-of-the-art review." In Ecological Restoration of Aquatic and Semi-Aquatic Ecosystems in the Netherlands (NW Europe). Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-1335-1_5.

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