Acropora subulata

Acropora subulata is a stony coral belonging to the family Acroporidae, known for its branching growth form typical of the genus, in which numerous slender branches extend from a central axis to create complex three-dimensional structures. Like other Acropora species, it relies on symbiotic zooxanthellae for the majority of its energy needs and contributes calcium carbonate skeletal material to reef frameworks, providing habitat structure that supports fish and invertebrate communities. Colonies grow through the deposition of aragonite skeleton, with polyps extending primarily at night to capture plankton.

The species occurs in marine neritic waters across the Indo-Pacific region, with recorded distribution in the Marshall Islands, Madagascar, Australia, China, Japan, and Palau. It inhabits shallow reef environments where light penetration supports its symbiotic algae.

Population numbers are declining, and the species is listed as Endangered. Threats include coastal mining and quarrying activity that damages reef substrate, fishing and harvesting practices that disturb reef habitat, recreational activities such as diving and anchoring, and pollution from domestic wastewater and agricultural runoff that degrades water quality. The species also faces pressure from invasive species, disease, and habitat alteration linked to coastal development and land conversion for crops.

Conservation efforts affecting this species are largely embedded within broader coral reef protection frameworks, including marine protected areas across its range, water quality regulations targeting agricultural and urban runoff, and international trade monitoring under CITES, which lists all Acropora species. Restoration programs using coral fragmentation and outplanting are underway in parts of the Indo-Pacific.

Given the combination of ongoing local threats and broader reef degradation pressures, the population trajectory for this species remains downward, with no indication of imminent recovery.