Water Quality Trends and Eutrophication Indicators in a Large Subtropical Estuary: A Case Study of the Greater Charlotte Harbor System in Southwest Florida

Estuaries and Coasts, Journal Year: 2025, Volume and Issue: 48(2)

Published: Jan. 25, 2025

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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Nutrient availability in a freshwater-to-marine continuum: cyanobacterial blooms along the Lake Okeechobee Waterway

Harmful Algae, Journal Year: 2024, Volume and Issue: 139, P. 102710 - 102710

Published: Aug. 25, 2024

Language: Английский

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Day-ahead statistical forecasting of algal bloom risk to support reservoir release decisions in a highly engineered watershed

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 376, P. 124327 - 124327

Published: Feb. 6, 2025

Language: Английский

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Multi-Scale Analysis Based on Wavelet Transform of Reservoir and River Total Phosphorus Correlation and Determination of Monitoring Time Scales

Water, Journal Year: 2025, Volume and Issue: 17(5), P. 712 - 712

Published: Feb. 28, 2025

Total phosphorus (TP) dynamics between reservoirs and inflowing rivers critically affect eutrophication risks, but their multi-scale interactions remain insufficiently quantified. This study applied wavelet transform analysis to 8-year TP time series data from the Shanxi Reservoir its rivers. Key findings include following: (1) Morlet decomposition revealed dominant 8–16-month cycles for reservoir TP, contrasting with 4–8-month in river TP; (2) coherence identified a 90° phase lag (2–4 months delay) at scale; (3) time–frequency localization capability quantified rapid responses—reservoir reacted within 2 abrupt increases, showing stronger intensity. Multi-resolution further distinguished driving mechanisms: interannual (>12 months) governed variations, while seasonal (<8 controlled fluctuations. The demonstrated analysis’ dual strengths: resolving scale-specific through quantifying transient responses via metrics. shift exposes hysteresis transport, 2-month response threshold defines critical intervention timing. An adaptive monitoring framework is proposed as follows: ≤8-month sampling under stable conditions intervals during surges, providing decision tool precise water quality management.

Language: Английский

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A comparative analysis of data-driven modeling approaches to forecast cyanobacteria algal blooms in eutrophic lake discharge canals

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 380, P. 124834 - 124834

Published: March 13, 2025

Language: Английский

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Multi-Decade Variations in Sediment and Nutrient Export in Cascading Developmental Rivers in Southwest China: Impacts of Land Use and Dams

Water, Journal Year: 2025, Volume and Issue: 17(9), P. 1333 - 1333

Published: April 29, 2025

Anthropogenic activities (represented by dams and land use change) climate change have disrupted the delicate balance between natural anthropogenic factors affecting riverine material transport, yet their effects across different river basins remain underexplored. This study investigated multi-decade (1980–2023) variations in sediment particulate carbon (C), nitrogen (N), phosphorus (P) exports from Jinsha (JSR) Jialing River (JLR) basins, two cascading developmental systems Southwestern China, evaluated cumulative impacts of dam construction. The results revealed significant decreases fluxes both despite stable water discharge. Particulate declined 90.9–99.6% JSR (last decade vs. 1980–1989, with an abrupt occurring during 2002–2003) 54.0–79.3% JLR (with 1994). Over time, influence precipitation discharge on transport has diminished, whereas become increasingly dominant. Key drivers include forest expansion, increased impervious surfaces, reservoir construction, reductions grassland farmland; however, there are spatial differences relative importance these drivers. provides crucial insights for decision making regional ecological conservation development.

Language: Английский

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Identifying environmental impacts on planktonic algal proliferation and associated risks: a five-year observation study in Danjiangkou Reservoir, China

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Sept. 16, 2024

Language: Английский

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Influence of regulated water discharges on phytoplankton composition and biomass in a subtropical canal

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 373, P. 123470 - 123470

Published: Dec. 3, 2024

Phytoplankton composition and biomass were investigated in the C-43 Canal southwest Florida during a period of shifting discharges from water control structures. The canal receives regulated eutrophic Lake Okeechobee via S77 structure. During periods high discharge spring early summer, cyanobacteria dominated phytoplankton community, including blooms harmful algal bloom (HAB) species Raphidiopsis raciborskii, Limnothrix redekei Microcystis aeruginosa. low lake, mid-summer autumn, inputs to came primarily tributaries watershed surrounding C-43. decreased, but relative importance dinoflagellates increased, July. dinoflagellate community included Ceratium, Durinskia baltica, Glochidinium penardiforme, Gymnodinium fuscum, Parvodinium goslaviense, umbonatum/inconspicuum complex, Peridiniopsis quadridens, Woloszynskia reticulata, an unidentified thecate athecate species. D. baltica P. goslaviense recorded for first time Florida. Data was also obtained on temperature, conductivity, fluorescent dissolved organic matter, chlorophyll a, total nitrogen, inorganic phosphorus, PO

Language: Английский

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Regional nutrient emissions and hydrological regime modulate the spatiotemporal patterns of nutrient levels within lake bay

Ecological Indicators, Journal Year: 2024, Volume and Issue: 170, P. 113046 - 113046

Published: Dec. 31, 2024

Language: Английский

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