White band disease is a coral disease that affects acroporid corals and is distinguishable by the white band of exposed coral skeleton that it forms. The disease completely destroys the coral tissue of Caribbean acroporid corals, specifically elkhorn coral (Acropora palmata) and staghorn coral (A. cervicornis). These symptoms are similar to white plague, except that white band disease is only found on acroporid corals, and white plague has not been found on any acroporid corals. It is part of a class of similar disease known as "white syndromes", many of which may be linked to species of Vibrio bacteria. While the pathogen for this disease has not been identified, Vibrio carchariae may be one of its factors. The degradation of coral tissue usually begins at the base of the coral, working its way up to the branch tips, but it can begin in the middle of a branch. The band, which can range from a few millimeters to wide, typically works its way from the base of the coral colony up to the coral branch tips. The band progresses up the coral branch at an approximate rate of 5 millimeters per day, causing tissue loss as it works its way to the branch tips.

There are two variants of white band disease, type I and type II. Type II of white band disease can be mistaken for coral bleaching. The bacteria shifts from a dominant pseudomonad population to an increasingly dominant Vibrio carchariae population. The study focuses on coral cells and the corals' gene responses, highlighting the importance of internal coral mechanisms rather than external factors alone.

Impact and range

Since white band disease was first reported in the 1970s, the disease has led to the devastation of approximately 95% of the elkhorn and staghorn corals in the Caribbean region. Elkhorn and staghorn corals are two of the major reef-building corals, the foundation on which the rest of the coral reef is formed.

Transmission

White band disease is highly contagious through direct contact between diseased and healthy coral tissue. C. abbreviata, a species native to the region where Elkhorn and Staghorn corals are found, is able to act as a "reservoir" for white band disease, meaning that it is able to retain the disease pathogen for at least two weeks.

Insights into the nature of white band disease transmission provide understanding of how the disease might be managed and controlled to prevent major losses in coral. The study suggests that early detection at the site of infection is crucial for controlling disease spread between healthy and infected corals

A 2025 study by researchers at Northeastern University tested whether treating healthy coral fragments with antibiotics could prevent white band disease. The study found that pretreated corals were much less likely to become infected. Antibiotic pretreatment reduced infection rates by about 30 percentage points compared to untreated fragments.

Effects of climate change

White band disease prevalence in the Caribbean varies seasonally.

Anthropogenic climate change is negatively impacting the world's corals and coral reef ecosystems. Over the next few decades as climate change continues, oceanic warming and acidification will accelerate and further damage the fragile reef ecosystems.. These findings definitely highlight how nutrient pollution may increase the severity of the coral epidemic.

Studies have shown that extreme weather changes, such as hurricanes, may also contribute to the increase of white band disease. Following Hurricane Dean, a study was conducted in the Banco Chinchorro Biosphere Reserve in Mexico to investigate the relationship between coral disease and the hurricane. The study found that physical damage from storms can increase the vulnerability of corals to disease. These results highlight the interaction between storms and coral disease in reef ecosystems.

See also

  • Aspergillosis, caused by the fungus Aspergillus sydowii, affects Gorgonian soft corals commonly known as sea fans.
  • Black band disease, caused by a microbial consortium dominated by the cyanobacteria Phormidium corallyticum.
  • Black necrosing syndrome affects gorgonian from the Great Barrier Reef, possibly a fungal pathogen similar to aspergillosis.
  • Brown band disease reported only from the Great Barrier Reef, cause is unknown although the dense brown band preceding the disease lesion contains the presence of ciliates ()
  • Dark spots disease, cause currently unknown, possibly an environmental stressor rather than a true pathogenic disease.
  • Rapid Wasting Syndrome, possibly caused by a fungus growing on areas damaged by the feeding of the stoplight parrotfish
  • Skeletal Eroding Band, associated with the ciliate Halofolliculina corallasia.
  • White plague, caused by the bacterium Aurantimonas coralicida.
  • White pox disease, caused by the bacterium Serratia marcescens.
  • Yellow-band disease AKA Yellow blotch disease, thought to be caused by Vibrio spp.

References

  • NOAA website on coral (public domain)
  • World Conservation Monitoring Centre Global Coral Disease Database
  • Coral's Ecological Value
  • Coral Reefs and Climate Change: Impacts on Humans
  • Coral reefs and Climate Change by Bruno