Harmful algal blooms under changing climate and constantly increasing anthropogenic actions: the review of management implications

Nwankwegu, Amechi S.; Li, Yiping; Huang, Yanan; Jin, Weiqing; Norgbey, Eyram; Sarpong, Linda; Lai, Qiuying; Wang, Kai

doi:10.1007/s13205-019-1976-1

Cited by 63 publications

(40 citation statements)

References 120 publications

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“…The seasonal population dynamics could be attributed to the characteristic seasonal uctuations in the nutrient concentrations, as well as the high taxonomic variability. The phytoplankton community structure is essentially controlled by the frequency in nutrient rate and supply ratios (Nwankwegu et al, 2019 (Harris et al, 2017). The signi cantly high population turnover in the Bacilliarophyta in winter con rms the absolute tolerance of diatoms to cold spells and the high mixing regimes that characterize winter bloom in XXB following the backwater intrusion from the mainstream TGR during the peak rise season.…”

Section: Seasonal Taxonomic Dynamicsmentioning

confidence: 99%

“…Considering the constantly changing climate and increasing anthropogenic actions (Nwankwegu et al, 2019) from urban discharge, agro-fertilizers, and the mining activities in the XXB catchments, the eutrophication impacts, trace metal pollution, and the seasonal pattern of the phytoplankton dominance in the tributary are likely to have changed over time. The few recent studies which involved microelements, nutrient limitation, phytoplankton community structure and water quality trends (Nwankwegu et al, 2020a;Huang et al, 2020;Li et al, 2019), are potentially limited by time as these studies characterized the ecosystem functions based on single-seasonal outcome and conclusions drawn from a point monitoring evidence which may not essentially apply to the other points across the tributary to the mainstream.…”

Section: Introductionmentioning

confidence: 99%

“…Eutrophication, which adversely affects both the chemical and ecological status of aquatic ecosystems worldwide has remained unabated despite several mitigation approaches (Nwankwegu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The biomass production as chl-a represents a more direct measure of the extent of primary productivity and bloom severity in the eutrophic freshwaters. The magnitude of biomass yield during an intense bloom can also provide a presumptive ecological assessment on the speci c genera/species dominating a bloom (Nwankwegu et al, 2019). The physiochemical index merely assesses the implications of the increasing anthropogenic activities including N& P inputs loading, as well as some pH and DO-altering chemicals.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Nwankwegu

Zhang

et al. 2021

Preprint

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The freshwater ecosystem characteristics in terms of nutrient inventory across seasons, spatial variations of chl-a biomass, and the phytoplankton community structure are prudent ecological assessment indices for a bloom management protocol. We evaluated the spatial and seasonal chl-a distribution under different nutrient conditions and phytoplankton community structure in a eutrophic Three Gorges reservoir tributary China. Result showed significant variations in biomass production with the mainstream reaches severely affected. The nutrient addition bioassay demonstrated significant stimulations on growth in both autumn and summer. The nutrient limitation pattern shifted from P in autumn and spring to N limitation during summer. Combined additions of trace metals with N, P, and Si in autumn and Fe alone enrichment in summer and spring showed maximum productivity. The phytoplankton community structure demonstrated strong sensitivities to seasonal variabilities with regime shift from Cyanophyta, dominated by the toxic and hypoxia generating, Microcystis spp in both autumn and summer, the Cryptophyta dominated by the Chroomonas acuta in spring to the Bacilliariophyta dominated by the genera, Cyclotella in winter. This reflected the ability of the Bacilliariophyta to thrive under a low-temperature condition. Combined N&P led to significant growth stimulation in summer while P alone controlled the bulk of the growth in autumn. The study points to the need for extending mitigation steps to the mainstream towards achieving lasting bloom management solution in the impacted tributary.

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Section: Seasonal Taxonomic Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Nwankwegu

Zhang

et al. 2021

Preprint

Self Cite

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“…It is important to know the site-specific system parameters (i.e., nutrient levels, pH, phytoplankton population dynamics, etc.) in order to provide effective decisions on managing a cHAB [24,26].…”

Section: Introductionmentioning

confidence: 99%

Bench-scale assessment of three copper-based algaecide products for cyanobacteria management in source water

et al. 2021

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Three copper-based algaecide products were investigated for use in a drinking water source to address cyanobacteria growth. Bench-scale experiments were used to determine the optimal dose of each product given Lake Rockwell’s indigenous population and reservoir-specific characteristics. The optimal dose of Cutrine Ultra was determined to be a quarter dose (corresponding to 0.125 mg/L Cu) as it decreased 55% of the cyanobacteria population with limited release of microcystin and minimal rebound in the cyanobacteria population. The optimal dose for EarthTec was determined to be a half dose (i.e., 0.5 mg/L). The full dose was optimal for SeClear (1 mg/L Cu). The optimal doses had extracellular microcystin levels of 0.99 ± 0.09 µg/L (quarter dose Cutrine Ultra), 3.69 ± 0.43 µg/L (half dose EarthTec) and 0.92 ± 0.26 µg/L (full dose SeClear) by day 2. EarthTec and Cutrine Ultra facilitated a similar overall response, and the cyanobacteria population was predominately suppressed in the initial 2 days following treatment and then increased between 7 and 14 days after treatment (i.e., rebound). Both the suppression within the first 2 days and the rebound between 7 and 14 days after treatment were a function of dose (e.g., lower dose, larger increase in rebound). Although SeClear suppressed the cyanobacteria population during the initial 2 days after treatment (42,000 ± 3240 cells/mL at the baseline to 4822 ± 841), the cyanobacteria population rebounded significantly (p < 0.05) between 2 and 7 days after treatment.

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Comparison of three typical lithium-ion batteries for pure electric vehicles from the perspective of life cycle assessment

Jiang,

Wang,

Jin

2023

Clean Techn Environ Policy

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In the present study, environmental impacts of lithium-ion batteries (LIBs) has become a concern due the large-scale production and application. The present paper aims to quantify the potential environmental impacts of three LIBs in terms of life cycle assessment (LCA), as well as to identify hotpots and ways to reduce the environmental impacts. Three different batteries are compared in this study: lithium iron phosphate (LFP) batteries, lithium nickel cobalt manganese oxide (NCM) 811 batteries and NCM622 batteries. The results show that the environmental impacts caused by LIBs is mainly re ected in ve aspects from eleven evaluation indexes. They are abiotic depletion (fossil fuels), global warming (GWP 100a), human toxicity, fresh water aquatic ecotox and marine aquatic ecotoxicity. Besides, the "Production phase" and "Assembly phase" of LIBs are the main sources of carbon emissions, the GHG emission of NCM622 battery is 1576 kg CO 2 -eq/kWh, which accounts for 37.5% of the total GHG emissions. The study shows that the hydrometallurgical method in the "Recycle phase" may not always be environmentally friendly, it can increase the indicators of human toxicity, fresh water aquatic ecotox and marine aquatic ecotoxicity. The precursor materials in NCM batteries and the electricity consumption of LFP batteries are sensitive factors to environmental impacts, which can be effectively improved by improving the process and optimizing the power structure. The ndings are likely to provide the LIBs manufacturing sector with data. Suggestions for process optimization of China's LIBs industry were proposed based on the adjustment projection of China's LIB industry.

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Harmful algal blooms under changing climate and constantly increasing anthropogenic actions: the review of management implications

Cited by 63 publications

References 120 publications

Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Bench-scale assessment of three copper-based algaecide products for cyanobacteria management in source water

Comparison of three typical lithium-ion batteries for pure electric vehicles from the perspective of life cycle assessment

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