Corals could be more resilient to rising temperatures and ocean acidification than scientists once thought.
“We do find something that’s a bit different than other people have found,” said Andréa Grottoli, an author of the study and a professor in the Earth sciences department at Ohio State University. “Our conditions were more realistic. Maybe there is more resilience out there. It certainly opens up the window to test that more thoroughly.”
To account for future global warming in some tanks, seawater was heated or treated to be more acidic before it entered the containers. Scientists warmed water to 3.6 degrees over pre-industrial times and made it more acidic so it would reflect what researchers expect if the world meets its Paris Climate Agreement goals.“In the control tanks, we saw very little mortality,” McLachlan said. “We saw very high growth rate of the coral — growth rates that mimicked what we saw on the reef.”
“They were struggling,” McLachlan said, adding that they might have been sensitive to a lack of zooplankton in the tanks. The results have limitations. The study provided results for three major reef-building species in Hawaiian waters, and its findings might not be applicable elsewhere. The study does not analyze the impacts of local stressors like pollution, overfishing, freshwater inundation and disease — key issues that can affect coral absent climate change.
More research is needed. Previous studies of corals have been shorter, often just a month in duration.
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