Raises hope of
economic and environmental benefits
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. This is responsible for
millions of fish kills worldwide each year and a threat to the £550m economy of
the Broads National Park 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.
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.
Fisheries
also stand to gain with the team already working with one business in Suffolk
to deal with an outbreak of harmful blooms.
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.
The
tests showed that fish and macroinvertebrates were unharmed by the
treatment.
Furthermore,
both this study and others 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 John Innes Centre/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 it’s 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”.
Andrea
Kelly, Senior Ecologist for the Broads Authority which manages the Broads
National Park said:
“The
Broads Authority has contributed to this important research, which is testing
practical solutions for dealing with fish kills resulting from
Prymnesium. In addition, despite considerable water quality improvement
over the past 2 decades, blue green algae is a problem for water users in some
areas of the Broads National Park. The use of hydrogen peroxide in the Broads
is a potentially useful new management tool, if approved for use, and we
welcome further testing and work with the John Innes Centre".
Exciting research promises further breakthroughs
Other
ongoing work highlighted by the John Innes Centre and UEA research
team includes:
Using
advances in DNA sequencing to monitor composition and abundance of algal blooms
and the virus which infects Prymnesium algae causing it to spill
fish-killing toxins into the water
Studying
the chemistry of toxins produced by Prynmesium to aid early warning
detection and possible use as an organic compound
Investigations
into a lytic virus discovered on Hickling Broad which
infects Prymnesium causing it to spill its toxic cell material into
the water. This work is addressing fundamental questions about the effect of
viral infection on toxin production and release in microalgae
In
another exciting development, researchers from the UEA have identified and
isolated the strain of Prymnesium algae that is specific to the
Broads system
With
the results of fundamental research likely to be several years away, there is a
current need for practical solutions to mitigate a growing rise in harmful
algal blooms caused by rising temperatures and eutrophication, the report in
Biochemical SocietyTransactions states.
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 (H2) -
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