Issue no. 164 - Eutrophication, Cyanobacteria, and Cyanotoxins Newsletter
From the Mainstream Media / Dans les médias grand public
United Kingdom: Fears for river pollution
as UK ditches EU farming rules after Brexit
“As of 1 January 2024, British farmers will no longer have to follow EU regulations on reducing agricultural runoff into rivers, or a series of other measures designed to promote good environmental practices.”
Researchers recently found evidence that airway exposure to the algal toxin microcystin can create an inflammatory response in lungs that is exacerbated in experimental models of asthma.
Michigan, USA: MSU ‘Edge-of-Field’ research
hopes to turn the tide in water quality
“They are examining the effectiveness of a water management system — controlled drainage — to see how it is best implemented and how effective this system is at keeping nutrients in fields rather than draining into surrounding waterways where they can create harmful algae blooms.”
Discussing
the environmental impacts of zero lake ice
“Another potential impact from the lack of ice is an increased risk of harmful algal blooms. Those blooms require warm water to get going and if the ice doesn’t last as long, then the lake water is able to heat up faster in the spring.”
South Dakota, USA: South Dakota's water
quality falls short of state standards
“Agricultural runoff, the most significant, introduces nitrates, phosphorus, and pesticides into water bodies. These contaminants can lead to algal blooms which deplete oxygen in the water, harming aquatic life and disrupting ecosystems.”
From the Scientific Media / Des médias scientifiques :
“In this study a total of 98 cyanobacterial blooms were sampled in 2016-2017 and identified regarding their toxin production and taxonomical compositions.”
“The fluxes of PP, TSS, and DOC decreased by 15%, 25%, and 8.9%, respectively, as a 5-year average. Role of gypsum in the reduction could not be conclusively quantified due to differences in the erodibility between control and gypsum areas.”
“In light of emerging data and ideas, we revisited foundational concepts within the context of Lake Erie algal blooms and derived five key take-aways.”
“Comparative estimates of external and internal phosphorus loading indicate that internal sources accounted for 70–95% of the total P input into the system during the study period.”
“Our results emphasized the differences of heat weaves impact on lakes of various latitudes, with the strongest increase in toxic cyanobacterial blooms in northern ‘cool’ lakes, situated in high latitudes. On the other hand, nutrients directly enhanced blooms across all the studied latitudes of Central Europe.”
“Understanding the causative mechanisms and the ecological consequences of HABs is crucial due to the considerable ecological, economic, and societal ramifications.”
Algae
in Recreational Waters: An Overview within a One Health Perspective
“The review process allowed us to acknowledge that this is the first comprehensive overview of algae in recreational waters carried out within a wider One Health outlook.”
Agricultural
management practices in China enhance nitrogen sustainability and benefit human
health
“We find an upswing of 10% in crop yields and an 8% reduction in nitrogen pollution during this period, owing to the promotion and adoption of various management practices (including the combination of organic and chemical fertilizers, straw recycling and deep placement of fertilizer).”
Cyanotoxins
in food: Exposure assessment and health impact
“It revealed a widespread occurrence of cyanotoxins in diverse food sources across 31 countries. Notably, 68% of the studies reported microcystin concentrations exceeding established Tolerable Daily Intake levels.”
The
spatiotemporal distribution of potential saxitoxin-producing cyanobacteria in
western Lake Erie
“In the NDS, saxitoxin (ng/cm2) and cyanobacteria chlorophyll were inversely correlated with the highest saxitoxin in September and at the deeper depth, whereas cyanobacteria chlorophyll was highest during June and at the shallower depth.”
“This review will encompass the direct utilization of microalgal biomass produced by phycoremediation as a valuable feedstock for the production of bio-stimulants, biofertilizers, and biopesticides for the agricultural sector.”
“We found that the dominant loss processes depend on several system specific factors including cyanobacterial genera-specific traits, in situ physicochemical conditions, and the microbial, phytoplankton, and consumer community composition.”
“This article presents for the first time a mathematical model that allows knowing the appropriate doses of different oxidants to eliminate this type of organisms in eutrophic waters.”
Eutrophication
evolution of lakes in China: Four decades of observations from space
“In this study, a remote sensing approach was developed to capture 40-year dynamics of trophic state index (TSI) for nationwide lakes in China.”
Climate
change intensifies algal biomass resurgence in eutrophic Lake Taihu, China
“Climate change and nutrient change contribute 64.9% and 35.1% to algal biomass resurgence in Lake Taihu, respectively.”
“Our results suggest that
eutrophic environments are not necessarily required for toxin-producing
cyanobacteria. Due to the differences between benthic growths with respect to
planktonic ones, we propose the adoption of the term Cyanobacterial Harmful
Algal Mats (CyanoHAMs) as a more precise descriptor for future studies.”
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