New solution to harmful algal blooms
A cheap, safe and effective method of dealing with harmful algal blooms is on the verge of being introduced following successful field and lab tests.
Moves to adopt use of hydrogen peroxide (H2O2) as an effective treatment against toxic algae are already underway following the results of new research by a team from the John Innes Centre and the University of East Anglia (UEA.)
Successful trials last summer showed that H2O2 was effective against the golden algae, Prymnesium parvum and that fish and macroinvertebrates were unharmed by the treatment.
This is responsible for killing millions of fish worldwide each year and a threat to the £550m economy of the Broads National Park in East Anglia, where trials are taking place.
Now follow up lab tests have demonstrated that controlled doses of the versatile chemical compound could be even more effective in dealing with cyanobacteria commonly known as blue green algae - a major public health hazard and potentially fatal to dogs and livestock.
Some of these exciting results have been published in the journal Biochemical Society Transactions along with a series of other scientific developments related to algal communities in the Broads National Park; one of the UK’s most popular and environmentally important network of waterways.
Dr Ben Wagstaff, one of the authors of the study from the John Innes Centre said: “We’ve demonstrated that the use of hydrogen peroxide is a practical, relatively easy way of managing these blooms.
“Work has already started to put together protocols for the use of hydrogen peroxide to control Prymnesium and our research showed that blue green algae are even more susceptible. You can potentially use even lower doses to wipe out blue-green blooms.”
The work in the Broads National Park could have widespread implications for the way harmful algal blooms are managed in waterways worldwide.
Steve Lane, Fisheries Technical Specialist at the Environment Agency which is helping to implement the research said: “It is really exciting how scientists, fishery managers, the angling community and partners have worked together and made such important progress to tackle Prymnesium, which is a serious threat to the multi-million-pound angling economy of the Broads. We are now working hard to make sure that we can use hydrogen peroxide to help manage future incidents, guided by the wonderful world-leading work that has taken place right here in Norwich."
Dr Wagstaff says that it’s not practical to treat much larger water systems in this way. But the adoption of H2O2 in smaller lakes and watercourses popular for sailing and water pursuits means they would no longer have to close for long periods when blooms occur.
Following successful field trials at Hickling Broad, Norfolk, last summer, detailed laboratory tests have been carried out which demonstrate how the H2O2 treatment impacts the complex array of species in the water.
The tests showed that within two hours blue-green algae is significantly reduced by doses of H2O2 to a greater extent even than Prymnesium and other algal organisms.
Fish and macroinvertebrates were unharmed by the treatment and studies have shown that ecosystems in open waterways to recover within days to weeks after H2O2 is applied.
Follow up trials involving the Prymnesium Stakeholders Group a multi-agency network that includes JIC/UEA researchers the Environment Agency, angling/environmental groups and the Broad Authority are looking at how best to apply H2O2so that it can be most optimally dispersed in the water.
For Dr Wagstaff and colleagues, the results mark a four-year cycle in which the research has taken great strides: “Five years ago, staff at Whitlingham Broad here in Norwich approached us about blue green algae and we couldn’t help. Now it may be possible. People have used hydrogen peroxide before but its use is not widespread. It just needs to be adopted and used in line with protocols so that more and more people realize how quick, cheap and effective it is.”
Factfile – algal blooms
- Blue-green algae - is the name given to cyanobacteria - a group of bacteria. When the algae blooms, a blue green scum often appears on the edges of lakes, and ponds. It produces harmful toxins which impair liver function – often fatally – in dogs. In humans, cyanobacteria can cause a range of symptoms including skin rashes, fever and headaches, muscle pain and breathing impairment.
- Prymnesium parvum - the golden algae is of concern to anglers and aquaculture industry because it produces the toxin Prymnesin. It is not harmful to humans or cattle, but can turn waters deadly for fish in a matter of hours.
- Hydrogen Peroxide (H2O2) - Best known as a hair bleaching agent (using strong concentrations), hydrogen peroxide has a range of uses depending on the dosage. It can be used as an antiseptic mouthwash, and laundry whitener. It is already used by the Environmental Agency to aerate water when oxygen levels dip – another reason why its use in tackling blooms is more cost effective than commercial algaecides. After use, it breaks down harmlessly into water and oxygen so offers strong environmental benefits compared with some commercial algaecides.
About the John Innes Centre
The John Innes Centre is an independent, international centre of excellence in plant science and microbiology.
Our mission is to generate knowledge of plants and microbes through innovative research, to train scientists for the future, to apply our knowledge of nature’s diversity to benefit agriculture, the environment, human health, and wellbeing, and engage with policy makers and the public.
The John Innes Centre is strategically funded by the Biotechnology and Biological Sciences Research Council (BBSRC). In 2015-2016 the John Innes Centre received a total of £30.1 million from the BBSRC.
The John Innes Centre is also supported by the John Innes Foundation through provision of research accommodation and long-term support of the Rotation PhD programme.
The John Innes Centre is the winner of the BBSRC’s 2013 - 2016 Excellence with Impact award.
For more information about the John Innes Centre visit our website www.jic.ac.uk
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