Coral Bleaching Of Northern Great Barrier Reef At 95 Percent
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An aerial survey of the northern section of the Great Barrier Reef has bleak news: 95percent of the region is now severely bleached. The finding comes just weeks after news that worldwide record-breaking temperatures have spurred widespread bleaching of thenorthernreef. At the time, the severity was not known. Now, a survey team says the situation is critical.
This will change the Great Barrier Reef forever, Professor Terry Hughes of James Cook University told local ABC radio station 7.30. We’re seeing huge levels of bleaching in the northern 1,000-kilometer (620miles) stretch of the Great Barrier Reef.
While bleaching can be triggered by a variety of factors, researchers are definitive on the cause for this reef section, which extends fromCairns to the Torres Strait: What we’re seeing now is unequivocally to do with climate change, said Professor Justin Marshall, a reef scientist from the University of Queensland.
Day 2 #coral bleaching surveys. 322 reefs assessed now. Most look like this. Ban #coal mines. pic.twitter.com/Jm9raFppwT
Terry Hughes (@ProfTerryHughes) March 24, 2016
Hard corals are chemists of simplistic solutions: They combine CO2with seawater to constructexoskeletons made of calcium carbonate. In doing so, they form finger-like coral, sponge-like coral, tree-like coralthe list goes on and on. Unfortunately, global warming has decimated both hard and soft coral reef communities by raising the temperature of their aquatic habitat, turning them from neon-colored treasures into ghostly white sticks.
Of the 520 reefsthe researchersexamined,only four remained unbleached.Yetthe previous conditionsof the once-colorful ribbon reefs deemed one of the most pristine coral regions in the worldcould work to its advantage.If environmental conditions improve and sea temperaturescool(as can happenduring winter months), this region hasa greater chance of bouncing back. However, it is important to note that with each bleaching event, the overall healthof the coral weakens.
It’s important to remember that bleaching doesn’t mean a coral dies, Dr. Tyrone Ridgway told IFLScience a few weeks back. It’s only if the heat stress persists that we see mortality. As of now, though, the outlook is not good.
There is some good news, however, for the southern and central regions of the Great Barrier Reef.The bottom three-quarters of the reef is in strong condition, said Hughes. [But] as we head north of Lizard Island it becomes increasingly prone to bleaching.
In-water surveys are now planned to gauge the exact extent of bleaching in the northern region.
Read more: http://www.iflscience.com/environment/coral-bleaching-northern-great-barrier-reef-95-percent
