https://www.ecowatch.com/great-barrier-deep-coral-bleaching.html
The Australian Marine Conservation Society (AMCS) has released video footage showing that the southern portion of the Great Barrier Reef is suffering from deep-sea coral bleaching, reported The Guardian.
The footage shows that the bleaching extends at least as far down as 59.1 feet — the deepest reported during this mass bleaching event, a press release from AMCS said. Some of the corals have begun to die in the face of record marine heat waves.
“I feel devastated. This bleaching event is the worst I have seen. It’s a severe bleaching event,” said Dr. Selina Ward, University of Queensland’s former academic director of the Heron Island Research Station, in the press release.
Ward reported extensive coral bleaching at all 16 southern Great Barrier Reef sites she had visited, saying it was the worst she had seen in three decades.
“I’ve been working on the Reef since 1992 but this [mass coral bleaching event], I’m really struggling with. The diversity of species involved has been hard to deal with. Look at bleached areas, there are many different species that are bleached – many of which are pretty resistant to bleaching so it’s not a pleasant one,” Ward added.
Last week, aerial survey data showed that 75 percent of the reef had experienced bleaching during the current bleaching event, with much of it classed as “high to extreme bleaching.”
During climate change-driven marine heat waves, extended periods of warmer ocean temperatures cause corals to become stressed, which leads them to expel the algae that live in a symbiotic relationship with them. These algae not only give corals their colorful appearance, but they are also their main source of energy, so long periods without them can lead to starvation.
“This new footage shows extensive coral bleaching in southern reefs, but there are images from the central and northern parts that show bleaching is extensive and severe in some of those areas too. Although in-water surveys will take months, the Great Barrier Reef Marine Park Authority has completed the aerial surveys but only released the data. The authority must urgently release the maps to show to the public the extent and severity of this bleaching event,” said Dr. Lissa Schindler, campaign manager with AMCS, in the press release.
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https://www.ecowatch.com/great-barrier-deep-coral-bleaching.html