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Coral face 'a stormy future'
Date:6/23/2009

As global warming whips up more powerful and frequent hurricanes and storms, the world's coral reefs face increased disruption to their ability to breed and recover from damage.

That's one of the findings from a new scientific study of the fate of corals in the wake of large climate-driven bleaching and storm events.

"We have found clear evidence that coral recruitment the regrowth of young corals drops sharply in the wake of a major bleaching event or a hurricane," says lead author Dr Jennie Mallela of the ARC Centre of Excellence for Coral Reef Studies and Australian National University.

Using the island of Tobago in the Caribbean as their laboratory she and colleague Professor James Crabbe of the University of Bedfordshire, UK, backtracked to 1980 to see what had happened to the corals in the wake of nine hurricanes, tropical storms and bleaching events.

"In every case there was a sharp drop in coral recruitment following the event often by as much as two thirds to three quarters. Not only were fewer new coral colonies formed, but also far fewer of the major reef building coral species recruited successfully."

"This finding mirrors our modelling studies on the fringing reefs of Jamaica, and on the Meso-American Barrier reef off the coast of Belize", says Prof. Crabbe.

Tobago lies outside the main Caribbean hurricane belt and therefore is more typical of the circumstances of most coral reefs around the world. Nevertheless its corals are disrupted by a major storm or bleaching every three or four years and the frequency of this may be growing.

"Climate researchers are seeing increasing evidence for a direct relationship between global warming and rising hurricane intensity as well as frequency," Jennie explains. "Global warming produces significant increases in the frequency of high sea surface temperatures (SSTs), and hurricane winds are strengthened by warm surface waters."

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Contact: Jennie Mallela
Jennie.Mallela@anu.edu.au
61-026-125-9960
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

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