In Florida, endangered coral finds a way to blossom

In a new study, researchers have found that the restoration efforts of the critically endangered species describes how researchers aimed to do this by studying environmental variables that might contribute to the species’ survival. In 2018, researchers at the United States Geological Survey (USGS) placed replicated elkhorn colonies in five different locations along Florida’s offshore coral reef. After two years, Grottoli’s team sampled the coral’s physiology to compare how the colonies fared.

Grottoli’s team measured a number of physiological traits important to the coral’s survival, including biomass, fat content and various markers for coral feeding. 

Overall, the health profiles of the elkhorn coral greatly differed among the five areas, but only the coral samples in the Dry Tortugas thrived compared to all the other sites, said Grottoli, as certain biological traits indicated that the Dry Tortugas corals were eating more zooplankton.

The favorable conditions these corals experienced are likely due to the site’s propensity for periodic upwellings, a wind-driven oceanographic phenomenon that can bring bursts of nutrient-rich water up to the surface from colder, deeper waters. These events stimulate zooplankton production and bring large quantities of the food source into the region, making the area a veritable oasis for elkhorn coral.  

“These little pulses of extra food can make a big difference in coral survival and the things we measured are consistent with that interpretation,” said Grottoli. 

Grottoli said their research was challenged by early COVID-19 travel constraints and bad weather, but the results add to a growing body of evidence that the Dry Tortugas would be a logical place to attempt to restore elkhorn coral. The study notes that restoring elkhorn corals in the Dry Tortugas may also provide a source population for new coral recruits throughout the Florida Keys, but further research is needed to determine if other at-risk species of coral may also thrive there, Grottoli said. Still, it won’t solve all the issues facing endangered coral populations. 

“We’re trying to make smart conservation and restoration decisions, but at the core of this work is that coral reefs are declining because of climate change and local stressors like overfishing and pollution,” said Grottoli. “Until we address those two things, no matter how smart we are about coral restoration and conservation, we’re always just putting a band-aid on it.”

This work was supported by the U.S. Geological Survey’s Coastal and Marine Hazards and Resources Program and the National Science Foundation. Other Ohio State co-authors were Leila Chapron and Ann Marie Hulver, as well as Ilsa Kuffner, Lucy Bartlett, Anastasios Stathakopoulos and Erin Lyons from the U.S. Geological Survey, and Dustin Kemp and Elise Keister from the University of Alabama at Birmingham. 

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