Image of the Day: Stress-Resistant Corals

Some corals can adjust to a range of temperatures, but this ability may be limited in a consistently warmer environment.

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Corals in places with widely fluctuating temperatures, such as areas of extreme high and low tides, are naturally resistant to temperature stress. A study published in Nature Communications Tuesday (September 17) found that although the stress-resistant coral Acropora aspera can maintain its health during heatwaves, its resilience is limited after adapting to a warmer climate.

Verena Schoepf and colleagues at the University of Western Australia transferred corals from a reef with variable temperatures in Northwest Australia to tanks that were either cooler or warmer on average. The cooler corals showed some signs of cold stress, but were still able to survive and acclimate—and they could cope with heatwaves. The ones in slightly warmer temperatures also adapted, as long as the heat was in a normal seasonal range. But once the researchers gave all of them two-week heat stress tests to examine their heat tolerance after acclimating to cooler or warmer ...

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