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Coral chemicals protect against warming oceans
Date:10/23/2013

Australian marine scientists have found the first evidence that coral itself may play an important role in regulating local climate.

They have discovered that the coral animalnot just its algal symbiontmakes an important sulphur-based molecule with properties to assist it in many ways, ranging from cellular protection in times of heat stress to local climate cooling by encouraging clouds to form.

These findings have been published in the prestigious weekly science journal Nature.

The researchers have shown that the coral animal makes dimethylsulphoniopropionate (DMSP). "The characteristic 'smell of the ocean' is actually derived from this compound, indicating how abundant the molecule is in the marine environment. In fact we could smell it in a single baby coral," says AIMS chemist Cherie Motti, and co-author on the paper.

"This is the first time that an animal has been identified as a DMSP producer. Previously it was assumed that the large concentrations of DMSP emitted from coral reefs came solely from their symbiotic algae," says lead author Jean-Baptiste Raina, of AIMS@JCU and the ARC Centre of Excellence for Coral Reef Studies at James Cook University (CoECRS).

Production of DMSP was found to increase when corals are subjected to water temperatures that put them under heat stress. DMSP and its breakdown products act as antioxidants (chemical defence compounds) protecting coral tissues from environmental stress, including that caused by high solar radiation.

The sulphur-based molecules also serve as nuclei for the formation of water droplets in the atmosphere and hence help to create clouds. If coral numbers decline, the scientists warn, there could be a major decrease in the production of DMSP and this, in turn, will impede cloud formation.

"Cloud production, especially in the tropics, is an important regulator of climate because clouds shade the Earth and reflect much of the sun's h
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Contact: Steve Clarke
s.clarke@aims.gov.au
61-419-668-497
Science in Public
Source:Eurekalert

Page: 1 2

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