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Reef-building coral exhibiting 'disaster traits' akin to the last major extinction event

March 03, 2020

  • Researchers identified an increased prevalence of five traits associated with previous extinction-survival responses among corals.
  • Human-driven climate change is rapidly increasing stressors on coral communities, such that 75% of species could become extinct within the next few centuries.
NEW YORK, March 3, 2020 -- A study published Tuesday in Scientific Reports shows that stony corals, which provide food and shelter for almost a quarter of all ocean species, are preparing for a major extinction event.

The research team--which includes scientists from The Graduate Center, CUNY; Baruch College; Scripps Institution of Oceanography; University of Haifa; University of Leeds; and GEOMAR Helmholtz Centre for Ocean Research--found that corals are currently exhibiting a suite of dynamic survival responses that correspond with their last major extinction 66 million years ago. These coral traits include increased prevalence of deep-water residing, cosmopolitan distributions, non-symbiotic relationship to algae, solitary or small colonies, and bleaching resistance.

Scientists were able to trace these behaviors due to excellent fossil records that coral skeletons leave behind. This study compared those fossil records to the modern International Union for Conservation of Nature (IUCN) Red List data. The IUCN Red List of threatened species is world's most comprehensive information source on the global conservation status of animal, fungi, and plant species.

"It was incredibly spooky to witness how corals are now exhibiting the same traits as they did at the last major extinction event," said Professor David Gruber, a researcher and marine biologist with The Graduate Center, CUNY and Baruch College. "Corals seem to be preparing to jump across an extinction boundary, while we are putting our foot further on the pedal."

The study highlights how primates do not possess survival characteristics or have a record of mass extinction survival as some corals do.

The researchers examined 250 million years of fossil coral data from the IUCN Red List and then compared similarities in the corals' recorded survival behaviors between the Cretaceous-Tertiary (KT) extinction event 66 million years ago (when the dinosaurs disappeared) and the current extinction event. Using the data, they were able to infer relevant traits, including an 18% decrease in coloniality, an 18% decrease in photosymbiosis, and a 12% decrease in the occupation of shallow habitats. Scientists also noted an evolutionary selection toward slower-growing coral, which may increase their chances of survival.

"This study reminds us that corals are diverse and flexible organisms with a demonstrated success facing the most extreme environmental crisis in Earth's history: mass extinction," said the study's first author Gal Dishon, a marine biologist with the Scripps Institution of Oceanography at the University of California. "Nevertheless, based on the lessons we learned from fossil data, the surviving corals will not be those reef builders we know from hyper-diverse tropical coral reefs, but rather small, solitary, slow-growing, and deep-dwelling corals."

The authors note that while slow recovery time (2-10 million years) of coral reefs following a mass extinction is distressing, they also call attention that primates (the order that also includes humans) are also increasingly becoming threatened with extinction.

"There is something very powerful about this message coming from the corals," said Gruber. "Corals are such a sensitive group of marine creatures, they are essentially the canary in the coal mine."
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About The Graduate Center of The City University of New York

The Graduate Center, CUNY is a leader in public graduate education devoted to enhancing the public good through pioneering research, serious learning, and reasoned debate. The Graduate Center offers ambitious students more than 40 doctoral and master's programs of the highest caliber, taught by top faculty from throughout CUNY -- the nation's largest public urban university. Through its nearly 40 centers, institutes, initiatives, and the Advanced Science Research Center, The Graduate Center influences public policy and discourse and shapes innovation. The Graduate Center's extensive public programs make it a home for culture and conversation.

Advanced Science Research Center, GC/CUNY

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