Issue no. 159 - Eutrophication, Cyanobacteria, and Cyanotoxins Newsletter
From the Mainstream Media / Dans les médias grand public
USA: Opinion - At what level of ‘do
something’ should agriculture begin to clean up nitrates?
“…as much as 70% of the nitrogen applied to farmland… leaked off fields and drained toxic nitrates into the region’s waters.”
Europe: European Countries Ditching Green
Measures After Weeks of Farmers Protesting
“For weeks, farmers have been out protesting EU climate policies meant to slash carbon and nitrogen emissions. The farmers have made headway as European Commission President Ursula Von der Leyen announced they are withdrawing the bill that slashes the use of chemical pesticides and nitrogen output by 2030.”
“Flowers grown on inexpensive floating platforms can help clean polluted waterways, over 12 weeks extracting 52% more phosphorus and 36% more nitrogen than the natural nitrogen cycle removes from untreated water, according to our new research.”
Ontario, Canada: Protecting Lake Erie From
Summertime Algae Blooms Is a Year-Round Effort
“Winter spreading of manure (applying fertilizer on frozen or snow-covered ground) is a practice under intense scrutiny because it increases the amount of fertilizer which runs off and seeps into rivers and lakes.”
Researchers
Warn on Eutrophication Potential of Ammonia
“Among the environmental problems that can be traced to use of ammonia are eutrophication and acidification.”
Gulf of Mexico: 'Legacy' phosphorus delays
water quality improvements
“Efforts to reduce the amount of phosphorus that enters the Mississippi River system are underway, but research suggests that remnants of the contaminant are left behind in riverbeds for years after introduction and pose an overlooked – and lingering – problem.”
US Drinking Water at Risk as Nitrogen
Pollution in River Basins Increases
“In a new study, scientists found that a third of the world's drinking water could be polluted with nitrogen by 2025.”
From the Scientific Media / Des médias scientifiques :
Introduction
to the topical collection on harmful algal blooms
“In this special collection, we highlight 11 articles that cover a wide range of topics associated with HABs.”
“This study addresses the limitations of monitoring data for analysis of patterns in cyanoHABs, based on the structure of the programs and frequency of observations.”
“This work showed that cyanobacteria are present in oligotrophic lakes and their community structure varies (i) diurnally, (ii) across the depth of the water column, (iii) interannually within the same lake and (iv) between different lakes that are closely interconnected within the same watershed.”
Spatial
and Temporal Variability of Saxitoxin-Producing Cyanobacteria in U.S. Urban
Lakes
“Further analysis targeting amplicons of the sxtA gene identified that Aphanizomenon and/or Dolichospermum are the primary STX producer, showing a significant correlation with sxtA gene abundances and STX concentrations.”
Legacy
Phosphorus and Ecosystem Memory Control Future Water Quality in a Eutrophic
Lake
“Through scenarios of water quality improvement, we showed that water quality variables have distinct phases of change determined by the turnover rates of storage pools—an initial and rapid water quality improvement due to water column flushing, followed by a much longer and slower improvement as sediment P pools were slowly reduced.”
“The available information on cyanotoxins (bio)transformation products (TPs) is reviewed to point out the potential research gaps and to disclose the most reliable enzymatic degradation pathways.”
Influence
of Different Cyanobacterial Treatment Methods on Phosphorus Cycle in Lake
System
“In this study, treatment methods using hydrogen peroxide (H2O2), polyaluminum chloride (PAC), and silver carp were investigated for their influence on the P cycle using microcosm experiments. Results showed that H2O2 treatment significantly increased the internal cycle of sediment-related P, while PAC and silver carp showed minor effect.”
Saturated
buffers: Improvements and issues
“Ultimately, the efficacy
of saturated buffers could be improved with minimal, low-cost additions to
their designs.”
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