All About Geneva – massive coral bleaching on the Great Barrier Reef

20 minutes - massive coral bleaching on the Great Barrier Reef
Written by Gabriel

According to the Great Barrier Reef Marine Park Authority (GBRMPA), air surveillance has shown that some southern and so far completely or largely spared areas of the world’s largest reef, the Great Barrier Reef on the north coast of Australia, are moderately or even heavily bleached. on Thursday with.

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Fading is the fading of the colorful stone corals. If the water temperature is too high, the cnidarians will repel the coloring algae with which they otherwise live in a community for mutual benefit. Without the so-called zooxanthellae, they cannot survive in the long run and die if the algae do not resettle within a few weeks or months.

Not all bleached corals die

The Great Barrier Reef extends over an area of ​​more than 344,000 square kilometers, exceeding the size of Italy. As early as 2016 and 2017, an estimated one-third to half of the corals had died after sea temperatures had risen. But not all bleached corals die: lightly or moderately bleached corals can recover.

According to the agency, the coral bleaching that has now been determined is due to warmer water temperatures, particularly in the Australian summer month of February. Experts are currently observing around 1,000 reefs from the air to estimate the total extent of coral bleaching, it was said. The reefs most visited by tourists in the north or in the middle of the Great Barrier Reef are only moderately bleached, as it was said.

Climate change promotes extinction

According to the agency, climate change remains the single greatest threat to the reef. The United Nations has warned in the past that 90 percent of all corals in the world would die if global temperatures rose 1.5 degrees Celsius.

(gave / sda)

Source–> https://www.20min.ch/ausland/news/story/25709783

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