Acropora willisae

Acropora willisae is a reef-building coral belonging to the family Acroporidae, one of the most diverse and ecologically important coral genera in the world. Like other Acropora species, it likely forms branching or plate-like colonies made up of many small polyps that secrete calcium carbonate skeletons, contributing to the physical structure of reef systems. These colonies provide habitat and shelter for a wide range of reef-associated fish and invertebrates, and the species participates in mass spawning events characteristic of many scleractinian corals, contributing to genetic exchange across reef populations.

The species is found in the marine neritic zone across parts of the western and southwestern Pacific, including Australia, Fiji, Vanuatu, New Caledonia, the Solomon Islands, Japan, and South Korea, occupying shallow coastal and reef habitats within this range.

Acropora willisae is classified as Endangered, with a decreasing population trend. It faces a combination of pressures, including fishing and harvesting activities, recreational use of reef areas, and pollution from domestic wastewater and agricultural runoff. It is also affected by invasive species, disease, and habitat alteration, all of which degrade water quality and reef structure.

Coral diseases and outbreaks of native species, such as coral-eating predators, add further stress to already vulnerable colonies.

Conservation efforts for Acropora corals generally include marine protected area management, water quality regulation, and reef monitoring programs across its range countries, several of which have established marine reserves encompassing coral habitats.

Given the combination of ongoing pollution, habitat degradation, and biological threats, the species' population trajectory remains negative, and continued monitoring and habitat protection will be necessary to prevent further decline.