'Huge Wake Up Call': Third of Central, Northern Great Barrier Reef Corals Dead (smh.com.au)

iONiUM quotes a report from The Sydney Morning Herald: More than one-third of the coral reefs of the central and northern regions of the Great Barrier Reef have died in the huge bleaching event earlier this year, Queensland researchers said. Corals to the north of Cairns -- covering about two-thirds of the Great Barrier Reef -- were found to have an average mortality rate of 35 percent, rising to more than half in areas around Cooktown. Bleaching occurs when abnormal conditions, such as warm seas, cause corals to expel tiny photosynthetic algae, called zooxanthellae. Corals turn white without these algae and may die if the zooxanthellae do not recolonize them. "It is fair to say we were all caught by surprise," Professor Hughes, director of the ARC Centre of Excellence for Coral Reef Studies at James Cook University, said. "It's a huge wake up call because we all thought that coral bleaching was something that happened in the Pacific or the Caribbean which are closer to the epicenter of El Nino events." The report says, "The northern end of the Great Barrier Reef was home to many 50- to 100-year-old corals that had died and may struggle to rebuild before future El Ninos push tolerance beyond thresholds."

Comments

Re:That's a known issue

[Livius]

Rushing off and blaming every adverse environmental outcome on climate change is in itself a religious belief system.

Which is why no-one listens to people like that.

But we do listen to actual scientists.

Re:Australia had the UNESCO report censored.

[Namarrgon]

A carbon price is a proxy for the missing external costs of coal power, so it helps raise the wholesale price to better reflect its true cost (which is around double current wholesale prices). This alone encourages alternatives - both demand for carbon-neutral alternative power, and investment in further renewable generation.

But of course, the revenue from that didn't vanish; it was funneled back into industry adaption schemes and consumer tax cuts. And it worked, driving emissions down significantly, until it was repealed in 2014 (at which point they immediately started rising again.

Re:GM coral

[Namarrgon]

Apparently these symbionts didn't adapt quickly enough; much of the coral is dead.

However, it's not unheard of for reefs to recover faster than expected, if the water quality is good enough, so there's still some hope that any remaining symbionts will be more resilient in future. Unless they get hammered again too quickly...