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Is iron from soil a factor in algal blooms?
Date:1/28/2010

Australia's own distinctive red soils could play a part in the formation of the stinking swathes of blue green algae often shovelled off east coast beaches in summer.

A QUT team of scientists is taking an in-depth look at how iron, which gives our iron-rich soil its red colour, reaches water to potentially contribute to the algal blooms, which not only have a foul smell, but also make our eyes sting, cause fich kills and smother seagrass.

Their research is centred on the catchment of Poona Creek on Queensland's Fraser Coast which drains into Great Sandy Strait-a dugong sanctuary and an internationally recognised wetlands for migratory birds.

Iron is known to be a component causative factor for algal blooms, but the mechanism by which solid iron in soils becomes soluble, and contributes to coastal algae blooms, is largely unknown.

That is why the team from QUT' s Institute for Sustainable Resources is taking the three-pronged approach of microbiology (biogeochemistry), geochemistry and hydrology studies to put together enough pieces of the iron jigsaw to form the basis for future research into mitigating causative factors contributing to dangerous algal blooms.

PhD student Lin Chaofeng is studying two types of bacteria in water that "feed on" iron.

"One type of bacteria in our waterways changes iron into a dissolved state and another type of bacteria oxidises the iron and turns it back into a insoluble form which can settle on the bottom of a creek ," Ms Lin said.

"The oxidising type of bacteria possibly makes the iron less available for as a contributing factor in algal blooms. It seems that these two bacteria usually balance each other out, but sometimes the balance is upset and so I am investigating how this happens."

QUT geology student Stefan Loehr is studying soil and sediment samples from the catchment to analyse their iron content and search for possible contributory mechanisms for iron dissolving in water.

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Contact: Niki Widdowson
n.widdowson@qut.edu.au
Queensland University of Technology
Source:Eurekalert

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