Blue-green algae blooms can release harmful toxins into the air

For the first time, scientists have observed the release of blue-green algae toxins into the air.

Traces of the algal toxin anatoxin-a, or ATX, sometimes called the Very Fast Death Factor, were measured at a Massachusetts pond that frequently hosts large algal blooms.

Scientists reported the discovery in a new paper, published Friday in the journal Lake and Reservoir Management.

ATX is produced by cyanobacteria, a type of photosynthesizing bacteria. Though not technically algae, cyanobacteria is often called blue-green algae.

ATX has been blamed for the deaths of livestock, waterfowl and dogs. Acute exposure can cause loss of coordination, muscular twitching and respiratory paralysis.

"ATX is one of the more dangerous cyanotoxins produced by harmful algal blooms, which are becoming more predominant in lakes and ponds worldwide due to global warming and climate change," lead author James Sutherland, an environmental scientist with the Nantucket Land Council, said in a news release.

Though airborne algal toxins had never been measured before, Sutherland and his colleagues hypothesized algal blooms could release toxins into the air under certain conditions.

During the late summer and early fall in 2019, researchers regularly collected air samples using a glass fiber filter at the edge of Capaum Pond on Nantucket Island in Massachusetts.

Scientists screened for an array of toxins using an analytical technique called liquid chromatography-tandem mass spectrometry. On a windy but foggy day, several samples revealed the presence of ATX in the air.

Researchers measured concentrations as high as 21 nanograms of ATX per milligram of air, and captured an average of 0.87 nanograms of ATX in each filter.

It's likely that brisk winds helped the toxins get airborne, while the surrounding fog prevented the toxins from being dispersed beyond detectable levels by the wind.

Scientists aren't sure how exactly the toxins are becoming airborne, whether the ATX molecules are enveloped in aerosolized water droplets or attaching themselves to other aerosolized particles.

It's also possible the cyanobacteria cells themselves are becoming airborne, they said.

No matter how it's happening, researchers say the phenomenon is a threat to the health and safety of humans and wildlife.

"People often recreate around these lakes and ponds with algal blooms without any awareness of the potential problems," said Sutherland.

"Direct contact or inhalation of these cyanotoxins can present health risks for individuals, and we have reported a potential human health exposure not previously examined," said Sutherland.

Related Links
Water News - Science, Technology and Politics

Tweet

Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Monthly Supporter
$5+ Billed Monthly

paypal only

SpaceDaily Contributor
$5 Billed Once

credit card or paypal

Seagrasses turn back the clock on ocean acidification
Davis CA (SPX) Apr 01, 2021
Spanning six years and seven seagrass meadows along the California coast, a paper published from the University of California, Davis, is the most extensive study yet of how seagrasses can buffer ocean acidification. The study, published in the journal Global Change Biology, found that these unsung ecosystems can alleviate low pH, or more acidic, conditions for extended periods of time, even at night in the absence of photosynthesis. It found the grasses can reduce local acidity by up to 30 percent ... read more