The water off South Florida is 32 degrees Celsius (32°C) in mid-July, and scientists are already seeing signs of coral bleaching off Central and South America. Know more:
In this NOAA image, a fish swims near coral showing signs of bleaching at Cheeca Rocks off the coast of Is-lamorada, Florida, on July 23. Scientists have seen devas-tating effects from prolonged hot water surrounding Flor-ida—coral bleaching and some death.The water off South Florida is 32 degrees Celsius in mid-July, and scientists are already seeing signs of coral bleaching off Central and South America.
I lead the Coral Program at the National Oceanic and Atmospheric Administration’s Atlantic Oceanographic and Meteorological Lab in Miami, Florida. Healthy coral reef ecosystems are important for humans in numerous ways. Unfortunately, marine heat waves are becoming more common and more extreme, with potentially devastating consequences for reefs around the world that are already in a fragile state.Coral reefs are hot spots of biodiversity.
But corals are quite sensitive to warming water. They host a microscopic symbiotic algae called zooxanthella that photosynthesizes just like plants, providing food to the coral. In the Port of Miami, where we have found particularly resilient coral communities, doctoral candidate Allyson DeMerlis documented the first coral bleaching of her experimentally outplanted corals on July 11.
To put that into context, a paper by NOAA scientist Derek Manzello showed that in the Florida Keys, the number of days per year in which water temperatures were higher than 32 C had increased by more than 2,500 percent in the two decades following the mid-1990s relative to the prior 20 years.
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