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Half a trillion corals: World-first coral count prompts rethink of extinction risks
https://phys.org/news/2021-03-trillion-corals-world-first-co...
"In the Pacific, we estimate there are roughly half a trillion corals," said the study lead author, Dr. Andy Dietzel from the ARC Centre of Excellence for Coral Reef Studies at James Cook University....The findings suggest that while a local loss of coral can be devastating to coral reefs, the global extinction risk of most coral species is lower than previously estimated....

"As an example, the finger-coral, Porites nigrescens, ranks amongst the ten most abundant species we examined [over one billion colonies]. It's also not considered to be highly susceptible to coral bleaching—yet it is currently listed by IUCN as vulnerable to global extinction," Prof Connolly said....

The study measured the population sizes of more than 300 individual coral species on reefs across the Pacific Ocean, from Indonesia to French Polynesia. The scientists used a combination of coral reef habitat maps and counts of coral colonies to estimate species abundances.

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