December 1, 2016 — Coral genotypes can survive for thousands of years, possibly making them the longest-living animals in the world.
Researchers have determined the ages of elkhorn corals, Acropora palmata, in Florida and the Caribbean and estimated the oldest genotypes to be more than 5,000 years old. The results are useful for understanding how corals will respond to current and future environmental change.
“Our study shows, on the one hand, that some Acropora palmata genotypes have been around for a long time and have survived many environmental changes, including sea-level changes, storms, sedimentation events, and so on,” says Iliana Baums, associate professor of biology at Penn State.
“This is good news because it indicates that they can be very resilient. On the other hand, the species we studied is now listed as threatened under the US Endangered Species Act because it has suffered such sharp population declines, indicating that there are limits to how much change even these very resilient corals can handle.”
Many people mistake corals for plants or even non-living rocks, but corals actually consist of colonies of individual invertebrate animals living symbiotically with photosynthetic algae.