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https://theconversation.com/we-knew-ningaloos-coral-bleaching-was-severe-but-what-we-found-6-months-later-was-still-a-shock-270266>
"The heatwave in Western Australia last summer broke records. As marine
scientists, we were deeply concerned about whether Ningaloo’s corals would
survive. We were prepared for the worst, but what my colleague and I found when
we returned to assess the damage months later was still a shock.
It was the longest-lasting, largest and most intense underwater heatwave ever
recorded in WA. And it hammered the coral at Ningaloo Reef, part of the World
Heritage-listed Nyinggulu or Ningaloo Coast, in the northwest of the state.
(The word Ningaloo comes from the Aboriginal name Nyinggulu, which means a
promontory or headland).
For coral, sustained heat stress is measured using degree heating weeks (DHW).
At 4 DHW, coral bleaching is likely. At 8 DHW, many corals are at risk of
bleaching and dying. At 20 DHW 80% mortality is predicted. At Ningaloo Reef
last summer, more than 20 DHW were recorded.
In October, we returned and found that two in every three corals in the shallow
lagoonal areas of the northern Nyinggulu Reef, including popular tourist sites
such as Turquoise Bay, had died."
Cheers,
*** Xanni ***
--
mailto:xanni@xanadu.net Andrew Pam
http://xanadu.com.au/ Chief Scientist, Xanadu
https://glasswings.com.au/ Partner, Glass Wings
https://sericyb.com.au/ Manager, Serious Cybernetics