branch Coral

This species forms rough arborescent colonies, reaching several meters in diameter. Its structure is characterized by particularly stout and thick branches, measuring up to 25 cm in thickness.

The surface of these branches has a characteristic bumpy appearance, due to the presence of densely covering secondary ramules of uniform height. The axial corallites are tubular and prominent, while the radial corallites are immersed. The coloration varies from cream to brown, often with brightly colored branch tips (blue, purple, yellow) depending on light exposure and zooxanthellae density.

This branch coral is a fast-growing sessile species, typical of well-lit shallow reef zones. It deploys its polyps and stinging tentacles mainly at night to capture zooplankton, although this activity may continue during the day in murky waters.

The species is highly sensitive to environmental variations: it reacts to thermal stress (temperature anomalies >1°C) by expelling its zooxanthellae, leading to rapid bleaching. Unlike other more resilient corals, Acropora florida shows low recovery potential after such events and high susceptibility to diseases and predation by the Crown-of-Thorns starfish. Its presence is strictly tied to live reef structures, where it plays a major role in the structural complexity of the habitat.

This coral is mixotrophic. It derives most of its energy (up to 90%) from photosynthesis carried out by symbiotic algae (zooxanthellae) hosted in its tissues. In addition, it actively captures zooplankton, invertebrate larvae, and suspended organic particles using its stinging tentacles. This heterotrophic nutrition is crucial to support its rapid growth and calcification, particularly during periods of thermal stress when photosynthetic symbiosis is compromised.

This coral is a synchronous hermaphroditic species. Sexual reproduction occurs during massive spawning events, generally synchronized with lunar cycles and summer temperatures. Mature gametes (eggs and sperm) are released into the coelenteron of each polyp and then expelled through the mouth directly into the water column.

External fertilization gives rise to a zygote that rapidly develops into a planktonic planula larva. After a drifting phase allowing species dispersion, the larva attaches to the substrate by its aboral pole. Metamorphosis then begins with the morphogenesis of tentacles, septa, and pharynx, transforming the larva into a founding polyp that initiates a new colony through asexual budding. Sexual maturity is reached around the age of 4 on average, with an estimated generation length of 10 years.