Montipora efflorescens

Montipora efflorescens is a reef-building coral in the family Acroporidae, characterized by encrusting to plate-like colonies formed from the calcium carbonate skeletons secreted by its constituent polyps. Like other scleractinian corals, it hosts symbiotic algae (zooxanthellae) within its tissues, which provide the coral with photosynthetic energy in exchange for shelter and nutrients. Colonies of this genus typically display fine tubercles or papillae across the coral surface, contributing to structural complexity on the reef.

As a reef-forming species, it contributes habitat structure that supports fish and invertebrate communities.

The species occupies shallow marine neritic waters across a broad swath of the Indo-Pacific, including French Polynesia, the Marshall Islands, Papua New Guinea, the Solomon Islands, New Caledonia, the Cook Islands, Madagascar, Micronesia, Seychelles, Australia, Mauritius, Sri Lanka, Kiribati, the Maldives, Thailand, Myanmar, Vanuatu, Vietnam, Taiwan, China, India, Japan, Palau, Fiji, and Oman.

Populations are declining due to a combination of pressures: destructive and unsustainable fishing and harvesting practices, physical damage from recreational activities such as diving and anchoring, disease outbreaks and pressure from problematic native species, and pollution from domestic and urban wastewater and agricultural runoff. Coastal development and land conversion for crops contribute to sedimentation and habitat alteration, while invasive species and shifting ocean conditions add further stress.

Conservation of this species largely occurs through broader marine protected area networks, coral reef monitoring programs, and international trade regulation, though species-specific interventions remain limited. Its listing as Endangered by the IUCN reflects an observed decreasing population trend. Without substantial reduction in cumulative reef stressors, continued decline is anticipated.