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Pacific corals in 'worrying' state: researchers

A survey of Pacific corals has found many severely bleached, some near-dead, according to marine researchers who warned recently that global warming threatened the precious ecosystem's very survival.

Sunday 24 September 2017, 12:00PM


This picture shows coral reefs in the lagoon of the Toau atoll, about 400 kilometres from Tahiti in the Tuamotu Archipelago in French Polynesia, on October 18, 2015. Photo: AFP
This picture shows coral reefs in the lagoon of the Toau atoll, about 400 kilometres from Tahiti in the Tuamotu Archipelago in French Polynesia, on October 18, 2015. Photo: AFP

An in-depth probe along a 50,000-kilometre (31,000-mile) stretch of the Pacific found that up to 90 percent of some coral colonies around the Samoan islands had been bleached.

Around the Tuamotu archipelago, up to half of colonies are bleached, according to researchers on board the French research schooner Tara.

Around the islands of Tuvalu and Kiribati, sections of reef were dead by the time the team got there.

Even in more temperate waters to the north, reefs did not escape bleaching, said the team, with up to 70 percent of corals damaged around Okinawa, Japan.

"All along Tara's Pacific route, we observed coral deaths and very serious bleaching," Tara scientific director Serge Planes of the French CNRS research institute told AFP in Paris, where the report was released.

Corals make up less than one percent of Earth's marine environment, but are home to an estimated 25 percent of marine life. They act as nurseries for many species of fish.

Corals are tiny, invertebrate marine creatures that live in colonies and require algae to survive. The algae live on the corals, providing them with food and the bold colours that reefs are known for.

Corals "bleach" when they are stressed by environmental changes -- due to ocean warming or pollution. They expel the algae and turn bone-white.

If the harm is not too severe, reefs can recover from a bleaching event, although this can take many years.

Tara departed on its mission from the port of Lorient in northwest France in May last year.

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It is about halfway through its mission, having visited 15 countries from east to west.

Wednesday's report was based on analysis of some 15,000 coral samples collected in 2,000 dives, and concluded that global warming is the main culprit.

The data revealed that bleaching events happen much more frequently than in the past, giving reefs less time to recover between bouts, said Planes.

"Clearly, these events are no longer associated with exceptional climate events," as in the past, when there were typically 20-25-year breaks between bleachings caused by such warming phenomena as El Nino.

Also, in sparsely populated areas like Polynesia, with comparatively little ocean pollution, warming is the only explanation for the coral damage, the team said.

"It is worrying," said Planes, adding that the data "throws into question the future of these coral reefs."

Corals are under pressure worldwide.

Earlier this year, researchers said Australia's Great Barrier Reef was experiencing an unprecedented second straight year of bleaching.

Meeting the warming limit set in the 2015 climate-rescue Paris Agreement may not be enough to protect Earth's coral ecosystem, warned the Tara researchers.

Nearly 200 nations agreed under the pact to limit average warming to two degrees Celsius (3.6 degrees Fahrenheit) over pre-industrial levels. A level of about 1C has already been reached.

 

 

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Christy Sweet | 26 September 2017 - 12:10:36

Want to know why the current US President is ignoring this issue?  Because he knows it's too late, and has likely been for decades. He simply wants to capitalize as much as he can now for his grandchildren  to live on a satellite sanctuary which is why NASA retains 100% budget for space tech, but drastic cuts for Earth science.
Here it is folks;  We are now at the beginning of the end of the environment's ability to support mammalian life. 
Instead of calling it " Climate change" (watered down from global warming)  better to call it what it is- Polar melting. And the methane under that rapidly melting ice has 100 x the greenhouse effect of Co2.  And it's not plants that supply our vital oxygen but oceans, and once those shut down-already proceeding as this story hints at, it won't be heat that kills us, but lack of oxygen. 
 Glad I'm not any younger, and glad to not have had children. I lived in the best of times, and it's downhill from here on out. 

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Kurt | 25 September 2017 - 09:54:42

It's the climate change. 
Mother Nature is showing us with more harsh weather ( stronger storms, typhoons, hurricanes, earthquakes) and signals from the marine life.
Melting ice north of Russia and Siberia, can reach North Pole over water, already possible to sail many months of the year the North route from Europe to Asia( make thinking about a shipping canal through Thailand a 'passed thought', 50 years to late to executive it. Not needed).
The people living on mother earth should stick strong to the Paris climate treaty.

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Bigaresort | 25 September 2017 - 08:43:13

I been there in the early 90.is and seen them,the coral were still pretty much ok from my point of view.It seems nobody really cares and everybody just talk about it and make sure to have a free Pacific holiday!Horst

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