Elkhorn Coral (Acropora palmata) lives in shallow Caribbean reefs, 1–5m depth across Caribbean Sea. It feeds on photosynthesis via zooxanthellae algae. Its conservation status is Critically Endangered.
Fascinating facts about the Elkhorn Coral
- Elkhorn coral can tower over 2 meters (more than 6 ft) and spread 13 meters (43 ft) wide, forming antler-like lattices that shelter countless reef species. Their colonies live for centuries, but they reach their full size in just 10-12 years, growing 5-10 cm (2-4 in) each year. This rapid build-up lets them keep pace with rising sea levels, creating the structural backbone of Caribbean reefs and buffering shorelines from wave damage.
- A single Elkhorn colony can span a 4-meter (12-ft) diameter and rise 2 meters (6 ft) tall, yet the species has lost about 97 % of its population since the 1980s. Scientists estimate a 97 % decline between 1980 and 2006, and a longitudinal study from 2005-2015 showed colony density dropping 0.4-0.7 times across its range. This collapse threatens the reef habitats that depend on its massive thickets for shelter and food.
- Elkhorn coral reproduces mainly by fragmentation: storm-driven waves break off branches that instantly root elsewhere, creating genetically identical clones. This asexual mode can occur any time of year, unlike its once-a-year sexual spawning that requires genetically distinct partners, yet only about 50 % of colonies are genetically unique.
- Elkhorn coral thrives in shallow, high-energy waters 1-5 m deep, where bright sunlight fuels its symbiotic zooxanthellae. These algae photosynthesize, turning carbon dioxide and water into sugars and oxygen, supplying most of the coral's energy. When turbidity blocks light, the coral can switch to night-time filter feeding, snatching zooplankton with its tentacles, though this is far less efficient.
Sources
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At a glance
RangeCaribbean Sea
HabitatShallow Caribbean reefs, 1–5m depth
DietPhotosynthesis via zooxanthellae algae
About the Elkhorn Coral
Elkhorn coral is named for its thick, flattened branches resembling elk antlers. It was once the defining species of the uppermost reef zone across the Caribbean and Florida Keys, forming dense thickets just below the ocean surface. Its massive plate-like colonies served as natural breakwaters protecting coastlines from storm surge.
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