Restoration of eutrophic freshwater by managing internal nutrient loads. A review

Zamparas, Miltiadis; Zacharias, Ierotheos

doi:10.1016/j.scitotenv.2014.07.076

Cited by 310 publications

(122 citation statements)

References 80 publications

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“…Before this study we did not know how the lake would respond to cessation of nutrient input, and one possibility was that early warnings would not arrive soon enough to avoid crossing thresholds (11,12). The threshold could have been crossed despite the halt because nutrient recycling has the potential to maintain eutrophic conditions long after nutrient additions cease (31,32). Hence, the manipulation could have resulted in a transition to cycling with high biomasses of phytoplankton as well as high turbidity, possible toxicity, and increased anoxia of bottom waters.…”

Section: Discussionmentioning

confidence: 99%

Reversal of a cyanobacterial bloom in response to early warnings

Pace

Batt

Buelo

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Directional change in environmental drivers sometimes triggers regime shifts in ecosystems. Theory and experiments suggest that regime shifts can be detected in advance, and perhaps averted, by monitoring resilience indicators such as variance and autocorrelation of key ecosystem variables. However, it is uncertain whether management action prompted by a change in resilience indicators can prevent an impending regime shift. We caused a cyanobacterial bloom by gradually enriching an experimental lake while monitoring an unenriched reference lake and a continuously enriched reference lake. When resilience indicators exceeded preset boundaries, nutrient enrichment was stopped in the experimental lake. Concentrations of algal pigments, dissolved oxygen saturation, and pH rapidly declined following cessation of nutrient enrichment and became similar to the unenriched lake, whereas a large bloom occurred in the continuously enriched lake. This outcome suggests that resilience indicators may be useful in management to prevent unwanted regime shifts, at least in some situations. Nonetheless, a safer approach to ecosystem management would build and maintain the resilience of desirable ecosystem conditions, for example, by preventing excessive nutrient input to lakes and reservoirs.

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Section: Discussionmentioning

confidence: 99%

Reversal of a cyanobacterial bloom in response to early warnings

Pace

Batt

Buelo

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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“…As a result, internal loading can delay (Gudimov et al 2012) recovery of water quality even after the external nutrient load has decreased. Before taking actions to deal with eutrophication, much preliminary work needs to be done (Zamparas and Zacharias 2014), including monitoring all the potential nutrient sources (e.g., external nutrient loading and internal nutrient loading). Assessments of external nutrient loading have traditionally received more attention, such as with long-term monitoring programs or modeling efforts to assess different scenarios of external loads.…”

Section: Comparison With Other Regionsmentioning

confidence: 99%

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Qin

Zeng

Zhang

et al. 2016

Environ Sci Pollut Res

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Much attention had been paid to reducing external loading of nutrients to improve water quality, while internal loading from sediment, which has been largely neglected, is also an important source for water eutrophication. The internal load in deep lakes or reservoirs is not easy to be detected and be quantified. In this study, three different methods (mass balance method, Fick's law, and regression equation) were combined to calculate the gross or/and net P release from sediment using limited data. Our results indicated that (1) ); (2) Hot periods of sediment releasing were suggested to occur from March to April and from August to September, which correspond to periods of high risks of algae blooms. The remaining months of the year were shown as net nutrient retention; (3) for the whole region, Baihedam and Chaohekuqu were identified as zones with a higher possibility to release P from sediment. (4) P loading to the Miyun Reservoir was greater in the inflow than in the outflow, suggesting a portion of the inflow P load was retained in the water or sediment; hence, release of sediment P may continue to be a major source of phosphorus in the future.

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“…Control of nitrogen in water resources is confounded by the potential of changes to available nitrogen forms and levels as a result of nitrogen cycling, among other factors. Although management of phosphorus levels may be modified by legacy phosphate and other mechanisms 7,8 , phosphate limitation is a common approach to managing eutrophication in fresh water. Nutrient limitation is a simple and obvious approach to eutrophication management, and has in some cases been successful.…”

Section: Introductionmentioning

confidence: 99%

rise and fall of dissolved phosphate in South African rivers

Griffin

2017

S. Afr. J. Sci.

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Eutrophication of water resources following nutrient loading is a global threat to water quality, and has been found to be one of the major threats to water quality in South Africa. Eutrophication is large-scale autotroph growth following nutrient enrichment and has several consequences, including loss of biodiversity, oxygen depletion, taste/odour generation and algal toxin production. Phosphate enrichment is often (but not always) the cause of freshwater eutrophication, and limitation of phosphate is commonly used as a means of controlling eutrophication. This study reports on a survey of trends in nutrient levels in South African freshwater resources. The research reported on here shows a significant decrease in dissolved phosphate levels in recent years, following a long period during which phosphate levels had been increasing with time. While changes in inorganic nitrogen were found, these changes did not match those in phosphate levels. Several potential causes of these changes were assessed, and it is concluded that no one cause can explain the changes observed. While the decrease in freshwater phosphate levels bodes well for water quality management, internal phosphorus cycling and other mechanisms are likely to mask the short-term impact of phosphate decreases.

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Restoration of eutrophic freshwater by managing internal nutrient loads. A review

Cited by 310 publications

References 80 publications

Reversal of a cyanobacterial bloom in response to early warnings

Reversal of a cyanobacterial bloom in response to early warnings

Estimating internal P loading in a deep water reservoir of northern China using three different methods

rise and fall of dissolved phosphate in South African rivers

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