On the Great Barrier reef recorded mass mortality of corals
Great Barrier Reef Marine Park / youtube.com
On the Great Barrier reef, which is located at the North-Eastern coast of Australia and is the world’s largest concentration of coral reefs, discovered large-scale bleaching. To understand the extent of the damage, our experts conduct an aerial survey on the area of 344 km2, according to the Management of the national marine Park of the Great Barrier reef (GBRMPA).
the cause of the incident is the warming of sea water, especially in February this year. Dead corals turn white and is clearly visible from the air: extended areas of the reef affected fully, although there are affluent areas, said broadcasting Corporation BBC.
Two-thirds of the Great Barrier reef suffered the same damage in 2016 and 2017. The administration said that a study from the air showed that death goes on with different intensity in different parts of the reef. But generally whitened sections is more than three or four years ago.
Experts explain that there is a high probability of coral mortality on a heavily bleached areas of reef. At the same time at a moderate or average degree of bleaching most corals will recover and survive this event.
In the previous two times death has affected two thirds of the territory of the reef, killing corals and diverse marine animals for which it is a unique habitat. “The reef was just starting to recover, and now the third round,” he told BBC News, senior researcher of the reserve, David Weichengeld.
“global climate change extreme events that affect corals occur more often and intensify,” he says, ” and the damage to the reef from each of them worsening.”
last year, Australian authorities have been forced to change the projected status of the protected reef from “poor” to “very bad”.
the Great barrier reef included in the world heritage List in 1981, covers a total area of 348 km2. Here are the 400 species of corals, 1.5 thousand species of fish and 4 thousand species of mollusks, according to the website of UNESCO.
the organization noted that the cause of serious discoloration and death of the world’s coral reefs is thermal stress.
In the years 2014-2017 global warming and heat stress has caused another wave of coral bleaching, during which injured at least 15 coral reef included in the world heritage List, is one of the highest rates of coral mortality in the entire history of observations.
it is Expected that the process of bleaching and mortality events will become much more intense in coming decades if emissions of carbon dioxide (CO2) will not be significantly reduced.
it is estimated that limiting the increase in global average temperature to 1.5°C compared to pre-industrial level (in accordance with the Paris climate agreement under the UN framework Convention on climate change) is crucial to the survival of coral reefs. In the evaluation recognizes the importance of decades of ocean Sciences for sustainable development UN, which will begin in 2021 and will be coordinated by the intergovernmental Oceanographic Commission (IOC) of UNESCO.