Coastal eutrophication in China: Trend, sources, and ecological effects

Harmful Algae, Journal Year: 2021, Volume and Issue: 107, P. 102058 - 102058

Published: June 13, 2021

Language: Английский

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Global divergent trends of algal blooms detected by satellite during 1982–2018

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(7), P. 2327 - 2340

Published: Jan. 7, 2022

Algal blooms (ABs) in inland lakes have caused adverse ecological effects, and health impairment of animals humans. We used archived Landsat images to examine ABs (>1 km2 ) around the globe over a 37-year time span (1982-2018). Out 176032 with area >1 detected globally, 863 were impacted by ABs, 708 had sufficiently long records define trend, 66% exhibited increasing trends frequency ratio (FRQR, number events observed year given lake available for that lake) or (AR, annual maximum covered surface lake), while 34% showed decreasing trend. Across North America, an intensification severity was FRQR (p < .01) AR before 1999, followed decrease .05) after 2000s. The strongest Asia, South Africa, Europe. No clear trend Oceania. climatic zones, contributions anthropogenic factors (16.5% fertilizer, 19.4% gross domestic product, 18.7% population) slightly stronger than drivers (10.1% temperature, 11.7% wind speed, 16.8% pressure, 11.6% rainfall). Collectively, these divergent indicate consideration as well climate change should be at forefront management policies aimed reducing waters.

Language: Английский

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Persistent eutrophication and hypoxia in the coastal ocean

Cambridge Prisms Coastal Futures, Journal Year: 2023, Volume and Issue: 1

Published: Jan. 1, 2023

Abstract Coastal eutrophication and hypoxia remain a persistent environmental crisis despite the great efforts to reduce nutrient loading mitigate associated damages. Symptoms of this have appeared spread rapidly, reaching developing countries in Asia with emergences Southern America Africa. The pace changes underlying drivers not so clear. To address gap, we review up-to-date status mechanisms global coastal oceans, upon which examine trajectories over 40 years or longer six model systems varying socio-economic development statuses different levels histories eutrophication. Although these share common features eutrophication, site-specific characteristics are also substantial, depending on regional setting level social-economic along policy implementation management. Nevertheless, ecosystem recovery generally needs greater reduction pressures compared that initiated degradation becomes less feasible achieve past norms time anthropogenic ecosystems. While qualitative causality between consequences is well established, quantitative attribution remains difficult especially when consider social economic because ecosystems subject multiple influences cause–effect relationship often non-linear. Such relationships further complicated by climate been accelerating few decades. knowledge gaps limit our mechanistic understanding human-coastal ocean nexus identified, essential for science-based making. Recognizing lessons from management practices, advocate better, more efficient indexing system an advanced earth modeling framework optimal modules human dimensions facilitate evaluation effective restoration actions.

Language: Английский

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Hindcasting harmful algal bloom risk due to land-based nutrient pollution in the Eastern Chinese coastal seas

Water Research, Journal Year: 2023, Volume and Issue: 231, P. 119669 - 119669

Published: Jan. 26, 2023

Language: Английский

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Harmful algal blooms in inland waters

Nature Reviews Earth & Environment, Journal Year: 2024, Volume and Issue: 5(9), P. 631 - 644

Published: Aug. 27, 2024

Language: Английский

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Harmful Algal Blooms in Eutrophic Marine Environments: Causes, Monitoring, and Treatment

Water, Journal Year: 2024, Volume and Issue: 16(17), P. 2525 - 2525

Published: Sept. 5, 2024

Marine eutrophication, primarily driven by nutrient over input from agricultural runoff, wastewater discharge, and atmospheric deposition, leads to harmful algal blooms (HABs) that pose a severe threat marine ecosystems. This review explores the causes, monitoring methods, control strategies for eutrophication in environments. Monitoring techniques include remote sensing, automated situ sensors, modeling, forecasting, metagenomics. Remote sensing provides large-scale temporal spatial data, while sensors offer real-time, high-resolution monitoring. Modeling forecasting use historical data environmental variables predict blooms, metagenomics insights into microbial community dynamics. Control treatments encompass physical, chemical, biological treatments, as well advanced technologies like nanotechnology, electrocoagulation, ultrasonic treatment. Physical such aeration mixing, are effective but costly energy-intensive. Chemical including phosphorus precipitation, quickly reduce levels may have ecological side effects. Biological biomanipulation bioaugmentation, sustainable require careful management of interactions. Advanced innovative solutions with varying costs sustainability profiles. Comparing these methods highlights trade-offs between efficacy, cost, impact, emphasizing need integrated approaches tailored specific conditions. underscores importance combining mitigate adverse effects on

Language: Английский

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Advancements in Biological Strategies for Controlling Harmful Algal Blooms (HABs)

Water, Journal Year: 2024, Volume and Issue: 16(2), P. 224 - 224

Published: Jan. 9, 2024

Harmful algal blooms (HABs) are a primary environmental concern, threatening freshwater ecosystems and public health causing economic damages in the billions of dollars annually. These blooms, predominantly driven by phytoplankton species like cyanobacteria, thrive nutrient-rich, warm, low-wind environments. Because adverse impacts HABs, this review examines various control methods, focusing on biological strategies as sustainable solutions. While effective disrupting populations, traditional chemical physical interventions carry ecological risks can be resource-intensive. Biological including biomanipulation using algicidal microorganisms such Streptococcus thermophiles, Myxobacteria, Lopharia spadicea, emerge eco-friendly alternatives offering long-term benefits. Additionally, barley rice straw application has demonstrated efficacy curbing HAB growth. approaches work inhibiting proliferation, cellular structures, fostering cell aggregation. Despite their advantages over conventional controls face challenges, intricate interactions. This article delves into latest techniques aimed at eradicating intending to diminish frequency reduce toxin levels aquatic most research date been confined laboratory settings, scaling these methods field applications presents hurdles due variability complexity natural ecosystems. The underscores need for further development critical area science.

Language: Английский

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Fate of a toxic Microcystis aeruginosa bloom introduced into a subtropical estuary from a flow-managed canal and management implications

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 375, P. 124362 - 124362

Published: Feb. 1, 2025

The Caloosahatchee Estuary in southwest Florida, USA, is regularly subject to the introduction of toxic Microcystis aeruginosa blooms, often originating from eutrophic Lake Okeechobee via C-43 Canal. focus this study was determine responses one these introduced blooms progressively elevated salinity levels as bloom water mass moved through estuary. In upper estuary, salinities were freshwater, and surface large colonies M. observed, along with peak microcystin toxin concentrations up 107 μg L-1, all particulate fraction. mid-estuary, increased 2-6, again 259 however, significant extracellular also observed (i.e., 17.8 L-1), suggesting a level osmotic stress on aeruginosa. lower ranged 6 25 very few viable but 0.5 L-1) present throughout column. It noteworthy that average total column + extracellular) remained constant movement during its transit revealing negligible rate degradation ten-day transit. results provide insights into changes distribution gradient, which has implications for management risks ecosystem human health, how may be affected by releases three control structures Discharge rates play major roles Canal-Caloosahatchee ecosystem. potential discharge regulation are discussed perspectives allochthonous autochthonous origin.

Language: Английский

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Warming Amplifies the Frequency of Harmful Algal Blooms with Eutrophication in Chinese Coastal Waters

Environmental Science & Technology, Journal Year: 2019, Volume and Issue: 53(22), P. 13031 - 13041

Published: Oct. 14, 2019

Widespread coastal eutrophication is known to increase the prevalence of harmful algal blooms (HABs). Increased HABs have also been linked climate change, with ocean warming predicted lead increased and earlier timing HABs. Testing predictions difficult due lack long-term observations across spatial scales. Here, we use a 45 year (1970-2015) record occurrence duration along Chinese coast show that HAB frequency has at rate 40 ± 4% decade-1, by 5.50 1.78 days decade-1. The increasing varied latitude significantly correlated an average 0.17 0.03 °C positive relationship being strongest in more eutrophic provinces. elevated dissolved inorganic nutrient concentration, but this was amplified further warming. Warming showed additive roles triggering Swift action mitigate essential avoid sharp waters

Language: Английский

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Scaling Up From Regional Case Studies to a Global Harmful Algal Bloom Observing System

Frontiers in Marine Science, Journal Year: 2019, Volume and Issue: 6

Published: May 22, 2019

Harmful algal blooms (HABs) produce local impacts in nearly all freshwater and marine systems. They are a global problem that require integrated coordinated scientific understanding leading to regional responses solutions. Given these natural phenomena will never be completely eliminated, improved of HAB dynamics coupled with monitoring ocean observations facilitates new prediction prevention strategies. Regional efforts underway worldwide create state-of-the-art forecasting tools, vulnerability assessments, observing networks. In the United States, include Alaska, Pacific Northwest, California, Gulf Mexico, Maine, Great Lakes, U.S. Caribbean islands. This paper examines several programs European Union, Asia concludes there is no one-size-fits-all approach. At same time, successful strong coordination stakeholders institutional sustainability maintain reinforce them automating technologies, wherever possible, ensure integration modelling multiple national programs. Recommendations for scaling up system HABs can summarized as follows: 1) advance improve cost-effective sustainable forecast systems address HAB-risk warning requirements key end-users at levels; 2) design leverage expand evaluate emerging technologies Essential Ocean Variables (EOVs) Biodiversity (EBVs) order support interregional technology comparisons networks capabilities; 3) fill essential need sustained, preferably automated, near real-time information from nearshore offshore sites situated transport pathways provide improved, advanced warnings; 4) merge ecological knowledge models existing Earth System Modelling Frameworks enhance end-to-end capabilities scenario-building; 5) seasonal decadal forecasts allow governments plan, adapt changing environment, coastal industries supported sustained years ahead; 6) implementation recent calls action by Nations Decade 2010 Sustainable Development Goals (SDGs) develop indicators relevant an effective early system.

Language: Английский

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