Increasingly severe cyanobacterial blooms and deep water hypoxia coincide with warming water temperatures in reservoirs

Global Change Biology, Journal Year: 2021, Volume and Issue: 27(11), P. 2507 - 2519

Published: March 28, 2021

Cyanobacterial blooms are expected to intensify and become more widespread with climate change sustained nutrient pollution, subsequently increasing threats lentic ecosystems, water quality, human health. However, little is known about their rates of because long-term monitoring data rare, except for some well-studied individual lakes, which typically large broadly dispersed geographically. Using spanning 1987-2018 20 temperate reservoirs located in the USA, we found that cyanobacteria cell densities mostly posed low-to-moderate health risks until 2003-2005, after rapidly increased. Increases were greatest extensive agriculture watersheds, but even those forested watersheds experienced increases. Since 2009, posing high have frequent 75% yearly observations exceeding 100,000 cells ml-1 , including 53% from watersheds. These increases coincided progressively earlier longer summer warming surface waters, evidence onset stratification, lengthening durations deep-water hypoxia, deep waters non-stratifying reservoirs. Among years, higher stratifying associated greater precipitation, warmer June temperatures, total Kjeldahl nitrogen concentrations. trends cyanobacterial already occurring as changing conditions regions increasingly favor proliferation. Consequently, negative effects on health, socioeconomic wellbeing could increase expand if pollution continue.

Language: Английский

---

Cyanobacterial community succession and associated cyanotoxin production in hypereutrophic and eutrophic freshwaters

Environmental Pollution, Journal Year: 2021, Volume and Issue: 290, P. 118056 - 118056

Published: Aug. 27, 2021

Language: Английский

---

Algae Biofilm Reduces Microbe-Derived Dissolved Organic Nitrogen Discharges: Performance and Mechanisms

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(9), P. 6227 - 6238

Published: April 23, 2021

Microbe-derived dissolved organic nitrogen (mDON) can readily induce harmful phytoplankton blooms, and thus, restricting its discharges is necessary. Recently, algae biofilm (AB) has attracted increasing interest for advantages in nutrient recovery. However, features mDON control remain unexplored. Herein, AB's formation utilization performance, molecular characteristics, metabolic traits have been investigated, with activated sludge (AS) as the benchmark comparisons. Comparatively, AB reduced by 83% when fed DON-free wastewater. When AS's effluent, it consumed at least 72% of exogenous notably amount protein/amino sugar-like compounds. Irrespective influent, ultimately produced more various unsaturated hydrocarbon lignin analogues. Redundancy network analysis highlighted algal–bacterial synergistic effects exemplified cross-feeding reducing concentrations shaping pools. Moreover, metagenomics-based reconstruction revealed that cyanobacteria Limnothrix Kamptonema spp. facilitated uptake, ammonification, recycling, which supplied extensive assimilatory demand amino acids, vitamins, cofactors biosynthesis, therefore promoted scavenging. Our findings demonstrate regardless secondary or tertiary process, cyanobacteria-dominated promising to minimize bioavailable discharges, implications future eutrophication control.

Language: Английский

---

Molecular characterization of dissolved organic nitrogen and phosphorus in agricultural runoff and surface waters

Water Research, Journal Year: 2022, Volume and Issue: 219, P. 118533 - 118533

Published: April 30, 2022

Language: Английский

---

Patterns in sources and forms of nitrogen in a large eutrophic lake during a cyanobacterial harmful algal bloom

Limnology and Oceanography, Journal Year: 2023, Volume and Issue: 68(4), P. 803 - 815

Published: Feb. 2, 2023

Abstract Western Lake Erie experiences an annual, toxic cyanobacterial harmful algal bloom (cyanoHAB), primarily caused by excess anthropogenic inputs of nitrogen (N) and phosphorous (P) . Because the non‐N fixing cyanobacteria species Microcystis dominates these blooms, N availability is hypothesized to play a central role in cyanoHAB progression, as well production N‐rich toxin microcystin. Many previous studies focused on nitrate because it most abundant substrate during initiation. However, recent work implicated reduced substrates like ammonium dissolved organic (DON) promoting greater biomass longevity. To examine relative importance oxidized phytoplankton different stages, we measured concentrations natural abundance δ 15 isotope values throughout entirety 2020 Erie. The results provide first data DON dynamics composition Erie, suggest that phytoplankton, including , likely relied regenerated from pool later stages. In addition, stable confirm delivered via Maumee River growth production.

Language: Английский

---

Nitrogen cycling and functional gene diversity of drinking reservoir area in agricultural districts: Implications for nitrogen transformation processes

Ecological Indicators, Journal Year: 2025, Volume and Issue: 173, P. 113349 - 113349

Published: March 18, 2025

Language: Английский

---

Spatial variation of dissolved organic nitrogen in Wuhan surface waters: Correlation with the occurrence of disinfection byproducts during the COVID-19 pandemic

Water Research, Journal Year: 2021, Volume and Issue: 198, P. 117138 - 117138

Published: April 11, 2021

Language: Английский

---

Spatiotemporal characteristics, influencing factors and evolution laws of water exchange capacity of Poyang Lake

Journal of Hydrology, Journal Year: 2022, Volume and Issue: 609, P. 127717 - 127717

Published: March 12, 2022

Language: Английский

---

Recovery of phosphorus from eutrophic water using nano zero-valent iron-modified biochar and its utilization

Chemosphere, Journal Year: 2021, Volume and Issue: 284, P. 131391 - 131391

Published: June 30, 2021

Language: Английский

---

Hourly remote sensing monitoring of harmful algal blooms (HABs) in Taihu Lake based on GOCI images

Environmental Science and Pollution Research, Journal Year: 2021, Volume and Issue: 28(27), P. 35958 - 35970

Published: March 8, 2021

Language: Английский

---