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Irukandji threat to southern waters
Date:10/28/2013

A Griffith University led study has made the surprising discovery that ocean acidification may provide some protection for South East Queenslanders from the Irukandji jellyfish.

Researchers from Griffith University's Australian Rivers Institute have conducted a series of climate change simulation experiments to investigate whether the dangerous tropical jellyfish, the Irukandji, is likely to establish breeding populations in the South East.

It was found that while higher sea temperatures could provide an opportunity for adult Irukandji to expand their range south, increasing ocean acidification may inhibit the development of juveniles.

The research is the first step towards assessing if Irukandji pose a significant threat to tourism and human health in the South East. The findings have been published in the journal Global Change Biology.

Lead author, Griffith PhD student Shannon Klein said concerns have arisen from evidence world-wide that tropical marine species are moving towards the poles as oceans warm.

"Increasing ocean temperatures and strengthening boundary currents have caused the poleward migration of many marine species," Shannon Klein said.

"These effects of climate change are particularly apparent on the eastern coast of Australia. Over the past 60 years the East Australian Current (EAC) has strengthened and now delivers warmer tropical waters further south by as much as 350km."

As a consequence at least five species of tropical fish that occur on the Great Barrier Reef (GBR) are predicted to be able of survive winter temperatures in waters off Sydney by 2080. Among all species that could potentially expand their range south, the Irukandji would arguably have one of the greatest socio-economic impacts.

Irukandji have historically been limited to waters north of Gladstone, however
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Contact: Helen Wright
helen.wright@griffith.edu.au
047-840-6565
Griffith University
Source:Eurekalert

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