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MessagePosté le: 17.10.18 06:42 Répondre en citantRevenir en haut

SYDNEY, Jan 5 (Xinhua) -- Australia's Great Barrier Reef will bleach more regularly as human induced climate change increases the frequency of mass coral bleaching events.

The World Heritage listed Great Barrier Reef suffered its worst mass bleaching event in early 2016 as El Nino-re-enforced warm water lifted sea surface temperatures some 0.73 degrees Celcius warmer than the 1961-1990 average, their warmest on Australia's weather bureau record. Some 90 percent of the GBR suffered bleaching, killing 20 percent of corals.

"The El Nino, in combination with background global warming, led to record-warm sea surface temperatures around much of Australia during the first half of the year, including in the Coral Sea and to Australia's northwest, where widespread coral bleaching was observed," Australia's Bureau of Meteorology said in its annual climate report on Thursday.

"The bleaching event in the northern part of the Great Barrier Reef was the worst on record, affecting some 1000 km of reef north of Lizard Island, while in Western Australia it was the third time a bleaching event has ever been recorded."

It's likely to be an annual event within the next half century however, a United Nations Environment Programme (UNEP) and University of Miami study projecting the future of coral reefs under climate change, published Thursday, shows. Reefs around Taiwan and the Bahamas will be the first to suffer the annual bleaching by 2043, with Bahrain, Chile and reefs in the Pacific to follow about a decade later.

Should the Paris Climate Summit's aspirational pledge to limit global temperatures rises by two degrees Celsius be met, it would buy Australia areas of the Pacific and other low and high latitude reefs approximately 25 more years for conservation efforts, the study shows.

"It is imperative that we take these predictions seriously and that, at the very minimum, we meet the targets of the Paris Agreement," UNEP chief Erik Solheim said in a statement.

"Doing so will buy time for coral reefs and allow us to plan for the future and adapt to the present."

Coral reefs are one of the most important and productive marine ecosystems that the world depends on for tourism and fisheries sustainability, generating an estimated 375 billion U.S. dollars for the global economy annually.

Coral bleaching occurs when stress such as heat caused the animal to expel the symbiotic algae, loosing vital nutrients and energy reserves, thus color, leading to the wide scale loss of productive habitats for fish.

The coral host then becomes weak and susceptible to disease. When bleaching is prolonged, the animal can die.

A single reef however needs on average five years to recover from just one bleaching event, thus annual bleaching will invariably cause major changes to the ecological function of one of the world's most precious resources, study leader Dr Ruben van Hooidonk of NOAA and the University of Miami said.

"Further, annual bleaching will greatly reduce the capacity of coral reefs to provide goods and services, such as fisheries and coastal protection, to human communities," van Hooidonk said.

PARIS Black Zach Cunningham Jersey , July 1 (Xinhua) -- China's Gong Lijiao met little resistance from her rivals en route to the women's shot put crown at the IAAF Diamond League Paris meeting on Saturday.

Olympic champions fared differently as Jamaica's Elaine Thompson continued to shine on the 100m track, contrary to a sluggish performance from women's 3,000m steeplechase world record holder Ruth Jebet and men's 110m hurdler Omar McLeod of Jamaica.

Gong recorded 18.56m in her first attempt Black Deshaun Watson Jersey , building a solid start compared with the second-placed Yuliya Leantsiuk at 17.83m. Anita Marton of Hungary, Gong's toughest rival in the event, just made it 17.82m at her first try.

Since witnessing 18.68m in the second attempt Black Whitney Mercilus Jersey , the confident Gong improved her result step by step until 19.14m at last, finishing the six best throws at the Charlety Stadium to the south of Paris. Marton was placed second with 18.48m, while standing first with a total of 25 points after four meetings Black Johnathan Joseph Jersey , one ahead of Gong. Leantsiuk finished third with 18.28m.

"The conditions at the stadium were very good today. I hope to come back next year," said Gong after her third consecutive triumph after Shanghai and Rome.

"My main target will be the World Championships in London in August, and I will go back to Germany tomorrow for preparation Black Jadeveon Clowney Jersey ," she added.

Thompson, the double winner of 100m and 200m in the Rio Olympic Games, clocked 10.91 seconds to stand out in the 100m event in French capital Black Lamar Miller Jersey , although that was 0.2 second short of her season best recorded in Kingston one week ago.

The Jamaican has extended her 100m winning streak to 17 races including heats, according to Diamond League statistics.

"In this moment, I am exactly where I want to be Black DeAndre Hopkins Jersey , feeling excited with one month to go to the World Championships," Thompson pointed out.

Christian Taylor became another Olympic champion to upper in Paris as he won the men's triple jump with 17.29 meters.

However, other Olympic gold medalists found it pretty hard to position themselves on top of the podium.

Jebet Black J.J. Watt Jersey , who wished to improve on her current world record of 8:52.78 set one year ago in the same meeting, just ranked fourth in the women's 3000m steeplechase with a result of 9:10.95.

McLeod fared even worse. The Jamaican could not build on his leading position in the heats and saw himself seventh with 13.41 seconds, with the title going to his compatriot Ronald Levy at 13.05.

Local favorite Renaud Lavillenie Benardrick McKinney Jersey , still recovering from his injury early in the season, lost to American Sam Kendricks again after the Shanghai meeting. The 2012 Olympic champion finished second at 5.62m, 20 centimeters lower than Kendricks' result.

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