Issue no. 169 - Eutrophication, Cyanobacteria, and Cyanotoxins Newsletter
From the Mainstream Media / Dans les médias grand public
Sweden: Nutrient load from horse farms
should be included in eutrophication work
“Research shows that nutrient leaching from horse farms can significantly increase phosphorus and nitrogen levels in nearby water bodies.”
“Officials found it had “unintended consequences” of mixing phosphorus-rich bottom water with the rest of the lake.”
Great Britain: Why polluted water held up
16,000 new homes
"Stopping a pig farmer at a very sensitive site enabled us to make a huge saving in the amount of nutrients that end up in the river and we were able to mitigate for around 1,200 new homes."
“The city of Stuart, the nonprofit Friends of the Everglades and four other environmental advocacy organizations plan to file a petition May 23 urging the Environmental Protection Agency to set numeric criteria for cyanotoxins.”
Minnesota, USA: Innovative Nitrate
Bioreactor in the City of Fairmont’s Wetland Restoration Project
“This innovative approach of using a nitrate bioreactor and restoring wetlands has the potential to be an invaluable tool in protecting public health through drinking water.”
Japan: Tokyo to recycle phosphorus from
sewage sludge for farm fertilizer
“Japan's annual phosphorus demand stands at approximately 300,000 metric tons, while sewage sludge across the country contains some 50,000 metric tons of phosphorus. In Tokyo alone, such sludge contains around 5,000 metric tons.”
Land
manager adds second woodchip bioreactor
“With an excavator, plastic and a carbon source, a section of land can be transformed into a practice that helps improve water quality and reduce nitrate loss.”
Michigan, USA: Toxic Great Lakes algae
makes Michigan sick. But remedy may be near
“The potential treatment, a group of microcystin-degrading bacteria from Lake Erie, may act as a probiotic that detoxifies microcystin and strengthens the body’s response to the algal toxin, lessening symptoms.”
New Hampshire, USA: UNH’s Stormwater Center
Undergoes a Renovation
“In an effort to figure out new, innovative ways to control or manage stormwater pollution, UNHSC is implementing six new systems to further understand the effect stormwater pollution has.”
Iowa, USA: Many Iowa rivers are brimming
with nitrate
“Des Moines Water Works activated its nitrate removal system last week.”
Opinion: Corn Belt fertilizer is killing
the Gulf of Mexico. Can we stop it?
“About 30 percent of the nitrogen applied for raising corn is lost to water, and much of it right now is draining off in the spring rise.”
From the Scientific Media / Des médias scientifiques :
Redistribution
of nitrogen to feed the people on a safer planet
“Lack of nitrogen limits food production in poor countries while excessive nitrogen use in industrial countries has led to transgression of the planetary boundary.”
“AHL significantly increased chlorophyll a (Chl-a) content and accelerated photosynthetic rate thereby promoting growth. Our findings deepen the understanding of the Quorum Sensing system in M. aeruginosa and are important for gaining insights into the role of QS in Microcystis bloom formation.”
“In this work, we proposed an integrated study strategy that included a multiproxy examination of the reservoir sedimentary record and a study of land-use changes.”
The
impact of algal blooms on promoting in-situ N2O emissions: A case in Zhanjiang
Bay, China
“Algal blooms caused a threefold increase in the in-situ production of N2O.”
“The findings concerning the composition of consumers and their food sources in Zhangze Reservoir indicate the urgent need to change the fish structure to optimise the structure of plankton community and mitigate phytoplankton overgrowth.”
“Thereby, the microcystin-induced GSH response was shown to be significantly different between human and mouse hepatocytes, challenging the current risk assessment based solely on a mouse study.”
“More damage to macromolecules was observed in females at the higher temperature, demonstrating that the increase in temperature can aggravate the toxicity of neurotoxins produced by R. raciborskii T3.”
“Cyanotoxins were detected in various fish organs, including muscles, with levels exceeding the tolerable daily intake in 60% of the studies.”
“Oxidation can remove cyanobacteria, but high doses of oxidants can result in significant cell lysis and release of intracellular metabolites, especially when using chlorine or ozone.”
“All treated waters were undetected with microcystins , indicating treatment processes were efficient at removing toxins from source waters. Results also showed that phycocyanin values had a significantly positive relationship with microcystin concentrations, Microcystis 16S rRNA gene copy numbers, and microcystin-producing mcyB gene copy numbers, suggesting these values can be used as a proxy for HAB monitoring.”
“The focus was on the principles and possible engineering applications of physical shading, ultrasound, micro-current, and ultraviolet (UV) technologies, in controlling abnormal algal reproduction.”
A
systematic view of phosphorus loss and its retention: Pathways, mechanisms, and
measures
“This systematic scheme
lays a foundation for understanding the relationship between phosphorus losses
and the corresponding phosphorus retention strategies.”
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