Is iron from soil a factor in algal blooms?
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.
He has studied the concentration of iron in soil in native vegetation and in pine plantations and found no significant difference in iron concentrations.
"It could be that different types of plants lead iron to be more easily soluble and so I am also investigating whether there are any differences between natural vegetation and plantation areas," Mr Loehr said.
Genevieve Larsen's study of subsurface and surface water and flow processes is aimed at finding out how the iron gets from the ground into the water, and the chemical reactions that may take place when groundwater interacts in the estuary with the marine environment.
"I'm looking for possible links between subsurface water and natural waterways such as streams, creeks and the sea," Ms Larsen said.
- Iron deficiency in soil threatens soybean productionMon, 6 Dec 2010, 14:51:00 EST
- Researchers publish results of an iron fertilization experimentWed, 18 Jul 2012, 15:06:22 EDT
- Iron legacy leaves soil high in manganeseFri, 10 Dec 2010, 10:36:14 EST
- Hysterectomy is associated with increased levels of iron in the brainTue, 4 Oct 2011, 17:07:34 EDT
- MRI: An accurate method to evaluate iron overloadMon, 31 Jan 2011, 10:35:09 EST
- Is iron from soil a factor in algal blooms?from Science CentricFri, 29 Jan 2010, 12:21:29 EST
- Is iron from soil a factor in algal blooms?from Science DailyThu, 28 Jan 2010, 11:21:31 EST
- Is iron from soil a factor in algal blooms?from PhysorgThu, 28 Jan 2010, 11:14:20 EST
- Is iron from soil a factor in algal blooms?from Science BlogThu, 28 Jan 2010, 10:56:32 EST
- Iron soils cause sea bloomsfrom Science AlertThu, 28 Jan 2010, 6:21:23 EST
Latest Science NewsletterGet the latest and most popular science news articles of the week in your Inbox! It's free!
Check out our next project, Biology.Net
From other science news sites
Popular science news articles
- Which qubit my dear? New method to distinguish between neighbouring quantum bits
- Chemical probe confirms that body makes its own rotten egg gas, H2S, to benefit health
- IQ link to baby's weight gain in first month
- Exposure to high pollution levels during pregnancy may increase risk of having child with autism
- Pioneering breakthrough of chemical nanoengineering to design drugs controlled by light
- Even with defects, graphene is strongest material in the world
- Detection of the cosmic gamma ray horizon: Measures all the light in the universe since the Big Bang
- Genetic engineering alters mosquitoes' sense of smell
- Allosaurus fed more like a falcon than a crocodile, new study finds
- 'Popcorn' particle pathways promise better lithium-ion batteries