Acropora robusta

Lore & Background

Acropora robusta was originally described as Madrepora robusta by Dana in 1846. It forms irregular colonies with thick branches toward the center and thinner branches at the outer edges. Its radial corallites are rasp-like and vary in diameter and shape. The species exhibits a range of colors including pink- or yellow-brown, cream, or bright green, with branches having pinkish ends. It occurs in the Red Sea, the Gulf of Aden, the southwest and northern Indian Ocean, the central Indo-Pacific, Australia, Southeast Asia, Japan, the East China Sea, and the oceanic west and central Pacific Ocean. It is found at depths from 1 to 8 metres in tropical shallow reefs, mainly along margins exposed to strong wave action.

Reader's Guide

Acropora robusta is classed as a least concern species on the IUCN Red List, though its population is believed to be decreasing. It is listed under Appendix II of CITES. While exact population figures are unknown, the species is likely threatened by the global reduction of coral reefs, rising temperatures causing coral bleaching, climate change, human activity, the crown-of-thorns starfish (Acanthaster planci), and disease. Its distribution spans a wide geographic range from the Red Sea and Indian Ocean to the central Pacific, indicating a broad but potentially vulnerable presence. The species' preference for wave-exposed margins suggests it plays a role in high-energy reef environments. Its listing under CITES Appendix II reflects international concern over trade and conservation, though its least concern status indicates it is not currently at immediate risk of extinction. The combination of decreasing population trends and multiple threats underscores the need for continued monitoring.

Did You Know?

• Its branches have pinkish ends, and the coral can be pink- or yellow-brown, cream, or bright green.
• It is found at depths between 1 and 8 metres in tropical shallow reefs.
• The species is threatened by the crown-of-thorns starfish (Acanthaster planci) and disease.