Navigation Links
Acid oceans warning
Date:10/17/2007

The worlds oceans are becoming more acid, with potentially devastating consequences for corals and the marine organisms that build reefs and provide much of the Earths breathable oxygen.

The acidity is caused by the gradual buildup of carbon dioxide (CO2) in the atmosphere, dissolving into the oceans. Scientists fear it could be lethal for animals with chalky skeletons which make up more than a third of the planets marine life.

Acid oceans will be among the issues explored by Australias leading coral scientists at a national public forum at the Shine Dome in Canberra tomorrow. The Coral Reef Futures 07 Forum is on October 18-19, 2007 and is hosted by the ARC Centre of Excellence for Coral Reef Studies (CoECRS).

Recent research into corals using boron isotopes indicates the ocean has become about one third of a pH unit more acid over the past fifty years. This is still early days for the research, and the trend is not uniform, but it certainly looks as if marine acidity is building up, says Professor Malcolm McCulloch of CoECRS and the Australian National University.

It appears this acidification is now taking place over decades, rather than centuries as originally predicted. It is happening even faster in the cooler waters of the Southern Ocean than in the tropics. It is starting to look like a very serious issue.

Corals and plankton with chalky skeletons are at the base of the marine food web. They rely on sea water saturated with calcium carbonate to form their skeletons. However, as acidity intensifies, the saturation declines, making it harder for the animals to form their skeletal structures (calcify).

Analysis of coral cores shows a steady drop in calcification over the last 20 years, says Professor Ove Hoegh-Guldberg of CoECRS and the University of Queensland. Theres not much debate about how it happens: put more CO2 into the air above and it dissolves into the oceans.

When CO2 levels in the atmosphere reach about 500 parts per million, you put calcification out of business in the oceans. (Atmospheric CO2 levels are presently 385 ppm, up from 305 in 1960.)

It isnt just the coral reefs which are affected a large part of the plankton in the Southern Ocean, the coccolithophorids, are also affected. These drive ocean productivity and are the base of the food web which supports krill, whales, tuna and our fisheries. They also play a vital role in removing carbon dioxide from the atmosphere, which could break down.

Professor Hoegh-Guldberg said an experiment at Heron Island, in which CO2 levels were increased in the air of tanks containing corals, had showed it caused some corals to cease forming skeletons. More alarmingly, red calcareous algae the glue that holds the edges of coral reefs together in turbulent water actually began to dissolve. The risk is that this may begin to erode the Barrier of the Great Barrier Reef at a grand scale, he says.

As an issue its a bit of a sleeper. Global warming is incredibly serious, but ocean acidification could be even more so.

Other issues at the forum include:

  • the latest science on coral bleaching

  • the rising plague of coral disease

  • managing Australias coral reefs under climate change

  • managing resilience in coral reefs

  • protecting sea water quality from activities on land

  • are green zones helping to replenish fish stocks on the GBR?

  • the plight of reef sharks and other top predators.

The forum will feature a public discussion hosted by ABC Science Show host Dr Robyn Williams on the future of Australias coral reefs, at 6 PM on Thursday, October 18, at the Shine Dome, Canberra.


'/>"/>

Contact: Malcolm McCulloch
61-261-259-969
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

Related biology news :

1. Anammox bacteria produce nitrogen gas in oceans snackbar
2. Oceans more vulnerable to agricultural runoff than previously thought, study finds
3. Scientists discover global pattern of big fish diversity in open oceans
4. Oceans turning to acid from rise in CO2
5. Climate experts search for answers in the oceans
6. Climate change will affect carbon sequestration in oceans, model shows
7. Understanding the oceans microbes is key to the Earths future
8. Oceans are 70 percent shark free
9. MIT: Oceans are a major gene swap-meet for plankton
10. Creating a window on oceans in motion
11. How ancient whales lost their legs, got sleek and conquered the oceans
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/9/2016)... AWRE ), a leading supplier of biometrics software and services, ... December 31, 2015.  --> --> ... an increase of 61% compared to $4.3 million in the same ... was $2.6 million compared to $0.2 million in the fourth quarter ... Higher revenue and operating income in the fourth quarter of this ...
(Date:2/5/2016)... Feb. 5, 2016 ... the "Global Facial Recognition Market 2016-2020" ... http://www.researchandmarkets.com/research/5kvw8m/global_facial ) has announced the addition ... 2016-2020" report to their offering. ... ) has announced the addition of the ...
(Date:2/3/2016)... , February 3, 2016 ... new market research report "Automated Fingerprint Identification System Market ... Latent Search), Application (Banking & Finance, Government, Healthcare, and ... by MarketsandMarkets, the market is expected to be worth ... of 21.0% between 2015 and 2020. The transformation and ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... , Febr. 10, 2016 /PRNewswire/ - BioAmber Inc. (NYSE: ... to announce that Mitsui & Co. Ltd., its partner ... acid plant, is investing an additional CDN$25 million in ... its stake from 30% to 40%.  Mitsui will also ... acid produced in Sarnia , providing ...
(Date:2/10/2016)... , Feb.10, 2016 ASAE is introducing a ... Management Companies (AMC) the option of joining or renewing ... fee determined by staff size, every employee in any ... ASAE and reap all available member benefits.   ... new organizational membership options will allow organizations of any ...
(Date:2/10/2016)... 2016  Matchbook, Inc., a company specializing in ... companies, announced today the appointment of Jim ... brings nearly 25 years of experience in supply ... nearly two decades in executive level roles as ... Genzyme and, most recently headed global logistics and ...
(Date:2/10/2016)... ... February 10, 2016 , ... SonaCare Medical, LLC reports ... program, Sonalinkā„¢ remote monitoring. The inaugural launch of this new technology occurred over ... Dr. Samuel Peretsman to a HIFU technical expert at SonaCare Medical headquarters. ...
Breaking Biology Technology: