Wairarapa Midweek 25th Jan 2017

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WEDNESDAY, JANUARY 25, 2017

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River toxin at large BY GERALD FORD

ABOVE TOP : A warning sign outlines the risks. LEFT & ABOVE: A mat of toxic algal bloom in Waipoua River, Masterton. PHOTOS/GERALD FORD

Toxic algae in Masterton’s Waipoua River is likely caused by farming and may be impacting stream life, according to an agricultural scientist. Mark Heath, an environmental scientist from Wellington Regional Council, was commenting on an outbreak of cyanobacteria, which is commonly known as toxic algae or algal bloom. The nutrient build-up that causes it can be from rural or urban sources, Dr Heath said. In the case of the Waipoua, the river runs by Queen Elizabeth Park and a few industrial sites, but “our assumption is most of it is coming from agricultural land use upstream”, Dr Heath said. “The other key components are rainfall, high sunshine and warm temperatures.” Cyanobacteria feeds off nitrogen in the waterways. In attaching itself to rocks the organism is able to draw freefl oating nitrogen from the water by trapping material underneath. It appears as black or brown “algal mats” on the riverbed. The material can be dangerous and even fatal to dogs and cause skin irritation for swimmers. Warning notices have been placed along the Waipoua River bank jointly by Greater Wellington Regional Council, Masterton District Council and Regional Public Health.

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1ACROSS THE ENTIRE RANGE ZERO DEPOSIT

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