> Powerboat-World.com
 
 
News Home Video Gallery Newsletters FishingBoating Features Photo Gallery Sail-World Australia Australian Cruising
MarineBusiness-World

 

Sail-World.com : Rising Co2 'Will Hit Coral Reefs Harder'

Rising Co2 'Will Hit Coral Reefs Harder'

'Coral reefs like the Great Barrier Reef are wonderfully diverse and productive habitats, important to both tourism and fisheries. Large predatory fish such as those seen here with the diver, perform important ecological roles on coral reefs, and important as a source of food to many millions of people in tropical regions.
Photo: Ove Hoegh-Guldberg, Centre for Marine Studies, The University of Queensland'    ARC Centre of Excellence Coral Reef Studies ©    Click Here to view large photo

Rising carbon dioxide levels in the world’s oceans could deliver a disastrous blow to the ability of coral reefs to withstand climate change.

A major new investigation by Australian scientists has revealed that acidification of the oceans from human CO2 emissions has the potential to worsen the impact of the bleaching and death of reef-building organisms expected to occur under global warming.

The study, by a team led by Dr Ken Anthony of the ARC Centre of Excellence for Coral Reef Studies and the University of Queensland, published in this week’s Proceedings of the (US) National Academy of Sciences (PNAS) concludes that earlier research may significantly understate the likely damage to the world’s reefs caused by man-made change to the Earth’s atmosphere.

In a large experiment on Australia’s Heron Island, the team simulated CO2 and temperature conditions predicted for the middle and end of this century, based on current forecasts of the world’s likely emission levels and warming by the Intergovernmental Panel on Climate Change (IPCC).

The results of their analyses of the bleaching, growth and survival of a number of organisms including corals indicates that a number of very important reef builders may be completely lost in near future.

'We found that coralline algae, which glue the reef together and help coral larvae settle successfully, were highly sensitive to increased CO2. These may die on reefs such as those in the southern Great Barrier Reef (GBR) before year 2050,' says Dr Anthony.

'Every time you start your car or turn on the lights, half the CO2you emit ends up in the oceans, turning them just a tiny bit more acidic, as well as causing the climate to warm. What is new is an understanding of how these two effects interact to affect the corals and reef building algae.'

The CoECRS team erected 30 large aquaria in the waters of Heron Island in the southern GBR and studied the combined effects of warming, high CO2 and sunlight on a large range of reef organisms for eight weeks.

'The results, frankly, are alarming,' says Professor Ove Hoegh-Guldberg. 'They clearly suggest that previous predictions of coral bleaching have been far too conservative, because they didn’t factor in the effect of acidification on the bleaching process and how the two interact.'

The results of the team’s analyses of the bleaching, growth and survival of key coral reef species indicate that a number of very important reef builders may be completely lost in the near future – in particular the coralline algae that glue the reef together and help coral larvae settle successfully, says Dr Guillermo Diaz-Pulido.

On the positive side, some coral species seem able to cope with the levels of ocean acidification expected by the mid-century by enhancing their rates of photosynthesis, says team member Dr David Kline. 'This is an important discovery that can buy the reef time while the nations of the world work together to stabilise CO2emissions,' he says.

'Although high CO2 causes corals to bleach and lose their symbiotic organisms, the surviving symbionts seem able to work harder. However, when CO2 levels in the water become too high, the symbiotic coral-algal system crashes and the corals die', adds Dr Sophie Dove.

'The implications of this finding are massive as it means that our current bleaching models, which are based on temperature only, severely underestimate the amount of coral bleaching we will see in the future,' Dr Anthony says.

'These results highlight the urgency of reducing CO2 emissions globally. Without political will and commitment to abatement, entire reef systems such as the Great Barrier Reef will be severely threatened in coming decades,' the team warns.

The results of the research are being offered to reef managers to help them develop strategies to protect the reefs which are most at risk.

Increasing heat stress from global climate change coupled with declining calcification rates due to ocean acidification may mean that coral dominated reefs may become a distant memory. High latitude reefs such as this one in Western Australia illustrate the struggle between coral and seaweeds.
Photo: Ove Hoegh-Guldberg, Centre for Marine Studies, The University of Queensland -  ARC Centre of?nid=50340 Excellence Coral Reef Studies ©   Click Here to view large photo


The combination of local (over-fishing, declining water quality) and global (global warming and ocean acidification) can often reduce coral reefs to nothing more than a slimy rubble heap. Often, it is difficult to get coral reefs to grow back in these places.
Photo: Ove Hoegh-Guldberg, Centre for Marine Studies, The University of Queensland -  ARC Centre of?nid=50340 Excellence Coral Reef Studies ©   Click Here to view large photo


http://www.coralcoe.org.au/




by ARC Centre of Excellence Coral Reef Studies

  

Click on the FB Like link to post this story to your FB wall

http://www.powerboat-world.com/index.cfm?nid=50340

9:22 AM Thu 30 Oct 2008 GMT






Click here for printer friendly version
Click here to send us feedback or comments about this story.


Power Boat News



























Understanding the Ocean's role in Greenland Glacier melt by Woods Hole Oceanographic Institution (WHOI),


Dangerous conditions for boating on entire NSW Coast by Transport Roads and Maritme Services,


Revealing report on Search for American yacht Nina released *Feature by Rob Kothe and the Sail-World team,












AYSS PacificNet/Tahiti voted a success! by Asia Pacific Superyachts,














Dangerous conditions forecast for NSW boaters by Roads and Maritime Services,


APSNZ appoints Duthie Lidgard as new MD by Asia Pacific Superyachts,


Whale freed from rope at Byron Bay by Department of Agriculture, Fisheries and Forestry,






World premieres and national debuts for Sydney International Boat Show
Marine Auctions experiencing rising tide of interest *Feature
Tags reveal Chilean devil rays are among ocean's deepest divers
Auckland On Water Boat Show to hold world record attempt
Zodiac at Sydney International Boat Show 2014 – Australian
Gold Coast International Marine Expo - Exhibitor space filling fast
Ceramic coated exhaust manifolds reduce engine bay temps on superboat
Reminder of safe distance requirements for whales
Changes to Australian bass closed season
Fusion achieves industry-wide acceptance of FUSION-Link
BSE Brisbane Slipways open for business as normal
Honda’s everywhere at Sydney International Boat Show!
Fifth round of XCAT World Powerboat Series moves to China
Sly 43 - Making her Australian premier
Maritimo full of confidence following recent wins
Australia event cements its position as hosting 'the' marina party
Up close and personal with whales on the Gold Coast
SA Marina Day encourages South Australians to enjoy their marinas
Southport Yacht Club raffle: Dusit Thani, BRIG Falcon, Marriott stay
Enjoy the whale spectacle, just keep your distance
The Dinghy Nav Light Solution- a brilliantly dumb idea   
Extension granted for salvage of a paddle steamer on the Murray River   
Sydney International Boat Show set to embrace new location   
Thermal imaging helping bulk carriers avoid collisions in port and in   
Third CYCA Solas Trusts grant to Australian Volunteer Coast Guard   
CruiseCraft adds Explorer 595 Hard Top   
Severe weather warnings prompt reminder to boat owners   
Be won over by the new Azimut 50   
Predictwind unlocks more features on free accounts   
Tammy Wolf and Mercury's Formula 2 Powerboat on to Divisional Champion   
Monaco Yacht Show 2014 - the biggest superyacht show ever   
Biggest Display ever and 18 launches at SIBS   
Gold Coast International Marine Expo helps Sailability grant FREEDOM   
Exhibitors heat up for Cannes Yachting Festival   
Benetti 108 tri-deck Tradition Supreme will launch in Cannes   
St Kitts open for superyacht business   
Marine World Sales: The latest in buying and selling marine online   
UIM XCAT - Massive fight from Fazza secures fourth consecutive title   
Peters & May launch Mediterranean and USA to East Coast Australia   
Lifejackets are imperative: don't rely on sheer luck   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png   http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL WAS PBW
LocalAds   DE  ES  FR  IT