Disease dynamics of Porites bleaching with tissue loss: prevalence, virulence, transmission, and environmental drivers

TitleDisease dynamics of Porites bleaching with tissue loss: prevalence, virulence, transmission, and environmental drivers
Publication TypeJournal Article
Year of Publication2015
AuthorsSudek M., Williams GJ, Runyon C., Aeby G.S, Davy S.K
JournalDiseases of Aquatic Organisms
Date Published2015/02
Type of ArticleArticle
ISBN Number0177-5103
Accession NumberWOS:000349301900007
Keywordsacropora-palmata; black-band disease; Branching coral; central pacific; Coral disease; Coral reef ecology; elevated-temperature; Etiology; Framework species; great-barrier-reef; growth anomalies; mass mortality; model; Porites compressa; selection; Tissue mortality; Water temperature; white syndrome

The prevalence, number of species affected, and geographical extent of coral diseases have been increasing worldwide. We present ecological data on the coral disease Porites bleaching with tissue loss (PBTL) from Kaneohe Bay, Oahu (Hawaii, USA), affecting P. compressa. This disease is prevalent throughout the year, although it shows spatio-temporal variability with peak prevalence during the warmer summer months. Temporal variability in disease prevalence showed a strong positive relationship with elevated water temperature. Spatially, PBTL prevalence peaked in clearer waters (lower turbidity) with higher water flow and higher densities of parrotfish, together explaining approximately 26% of the spatial variability in PBTL prevalence. However, the relatively poor performance of the spatial model suggests that other, unmeasured factors may be more important in driving spatial prevalence. PBTL was not transmissible through direct contact or the water column in controlled aquaria experiments, suggesting that this disease may not be caused by a pathogen, is not highly infectious, or perhaps requires a vector for transmission. In general, PBTL results in partial tissue mortality of affected colonies; on average, one-third of the tissue is lost. This disease can affect the same colonies repeatedly, suggesting a potential for progressive damage which could cause increased tissue loss over time. P. compressa is the main framework-building species in Kaneohe Bay; PBTL therefore has the potential to negatively impact the structure of the reefs at this location.

Short TitleDis. Aquat. Org.
Student Publication: