In a newly published USGS study of cyanobacterial blooms in Midwest lakes, taste-and-odor compounds were found almost every time cyanotoxins were found, indicating odor may serve as a warning that harmful toxins are present.
“It is commonly believed that there are no health risks associated with taste-and-odor compounds,” said Dr. Jennifer Graham, USGS limnologist and lead scientist on this study. “While taste-and-odor compounds are not toxic, these pungent compounds were always found with cyanotoxins in the blooms sampled. This finding highlights the need for increased cyanotoxin surveillance during taste-and-odor events so that the public can be advised and waters can be effectively treated.”
Cyanotoxins are produced by some cyanobacteria. Cyanobacteria commonly form a blue-green, red or brown film-like layer on the surface of lakes and reservoirs. This phenomenon is frequently noticed in the United States during the summer, but also occurs during other seasons.
Cyanotoxins can be poisonous to people, aquatic life, pets and livestock. Removing or treating affected water can be both costly and time-intensive. Cyanotoxins are currently on the U.S. Environmental Protection Agency’s drinking-water contaminant candidate list, and many states include cyanotoxins in their freshwater beach-monitoring programs.
“Exposure to these toxins has caused a range of symptoms including skin rashes, severe stomach upset, seizures, or even death,” said Dr. Keith Loftin, USGS research chemist and environmental engineer. “Pets and livestock are most susceptible to direct exposure, but people can also be affected during recreation, by eating contaminated foods, or by drinking contaminated water that has not been treated properly.”
For this study, a cyanobacterial bloom from each of 23 lakes in Iowa, Kansas, Minnesota and Missouri was sampled and analyzed for thirteen toxins and two taste-and-odor compounds. Lakes were targeted based on a known history of cyanobacterial bloom occurrence.
Microcystins, a specific type of toxin, are often the only cyanotoxin considered when evaluating risks associated with cyanobacteria in waters used for recreation or drinking water supply. Microcystins were found in all samples; however, this study also indicates that toxins other than microcystins may be more common than previously thought.
Taste-and-odor compounds were detected in 91 percent of samples. Since toxins occurred more frequently than taste-and-odor compounds, odor alone does not provide sufficient warning to ensure human-health protection against cyanotoxin exposure.
If you think you see a harmful algal bloom, avoiding it is the first course of action. A good second step is to notify local authorities responsible for the affected area, such as a lake manager, state health department, or other relevant state agencies.
The full journal article, published by Environmental Science and Technology, as well as additional information, photos, and an audio podcast about cyanobacteria, can be accessed at http://toxics.usgs.gov/highlights/algal_toxins/.
Kara Capelli | EurekAlert!
Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel
Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)
Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
19.03.2018 | Event News
16.03.2018 | Event News
13.03.2018 | Event News
23.03.2018 | Life Sciences
23.03.2018 | Materials Sciences
23.03.2018 | Process Engineering