Common name: elkhorn coral

General information

The Elkhorn Coral, Acropora palmata, is a prominent coral species known for its distinctive branching growth which resembles the antlers of an elk. This species is a critical reef builder in the Caribbean and is recognized for its fast growth rate and complex three-dimensional structure, which provides essential habitat for a diverse range of marine life.

Historically, A. palmata was one of the most abundant corals on Caribbean reefs, but its populations have suffered drastic declines due to disease, bleaching, and storm damage, leading to its listing as critically endangered by the IUCN.

Care

Elkhorn Coral requires intense lighting and strong water movement to thrive in captivity. It is best suited for experienced reefkeepers who can maintain high water quality and stable conditions. Calcium, alkalinity, and magnesium levels must be monitored and maintained to support its skeletal growth.

Symbiosis

Elkhorn Coral has a symbiotic relationship with zooxanthellae, photosynthetic algae that live within its tissues. These algae provide the coral with nutrients produced through photosynthesis, while the coral provides the algae with a protected environment and the compounds necessary for photosynthesis.

Habitat

Acropora palmata is typically found in shallow waters of the Caribbean Sea, the Bahamas, and the Florida Keys. It prefers the well-lit, surge zones of the reef crest, where it can be exposed to strong wave action that delivers the nutrients and oxygen it requires.