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Corals in Red Sea survive temperature increase. Cold? Not so much

Corals in Red Sea survive temperature increase. Cold? Not so much
Even a one degree Celsius drop in water temperature in the Red Sea could be enough to bleach the sea’s unique coral ecosystem.
Photos of coral in the Gulf of Aqaba courtesy Prof. Maoz Fine, Bar-Ilan University
Coral in the Red Sea is in danger of “bleaching” if water temperatures drop by as little as one degree Celsius. The results show for the first time that coral is not only sensitive to increases in temperature, but drops as well.
Climate change is unpredictable – the temperature of seas and oceans can both rise and fall as a result of global warming. However, the coral in the northern Red Sea and the Gulf of Aqaba has exceptionally high tolerance to increasing seawater temperatures. That led coral reef scientists to believe that the Red Sea’s coral were relatively safe from the bleaching effects suffered by reefs in other parts of the world. They even dubbed the region a “coral ree ....

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Northern Red Sea corals pass heat stress test with flying colors

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IMAGE: The aquarium system in which scientists submitted Northern red sea corals to various tempartures.
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Credit: Maoz Fine
Even under the most optimistic scenarios, most of the coral reef ecosystems on our planet - whether in Australia, the Maldives or the Caribbean - will have disappeared or be in very bad shape by the end of this century. That s because global warming is pushing ocean temperatures above the limit that single-cell algae, which are corals main allies, can withstand. These algae live inside coral tissue for protection and, in exchange, provide corals with essential nutrients produced through photosynthesis. Because the algae contain a variety of pigments and therefore give coral reefs their famous colors, if they are lost the corals turn white, which is known as coral bleaching. But in spite of the real threat caused by global warming, corals in the Red Sea look set to keep their vibrant color. ....

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