Gross and microscopic lesions in corals from Micronesia
MetadataShow full item record
We documented gross and microscopic morphology of lesions in corals on seven islands spanning western, southern, and eastern Micronesia. We sampled 76 colonies comprising 30 species of corals among 18 genera with Acropora, Porites, and Montipora dominating. Tissue loss comprised the majority (41%) of gross lesions sampled, followed by discoloration (30%), and growth anomaly (29%). Of 31 cases of tissue loss, most lesions were subacute (48%), followed by acute, and chronic (26% each). Of 23 samples with discoloration, most (40%) were dark discoloration, with bleaching and other discoloration each comprising 30%. Of 22 growth anomalies, umbonate growth anomalies comprised half with exophytic, nodular, and rugose growth anomalies comprising the remainder. On histopathology, for nine cases of dark discoloration, fungal infections predominated (77%), for seven bleached corals, depletion of zooxanthellae from the gastrodermis made up a majority of microscopic diagnoses (57%), and for growth anomalies other than umbonate, hyperplasia of the basal body wall was the most common microscopic finding (63%). For the remainder of the gross lesions, no single microscopic finding comprised over 50% of the total. Host response varied with the agent present on histology. Fragmentation of tissues was most often associated with algae (60%) whereas necrosis dominated (53%) for fungi. Two newly documented potentially symbiotic tissue-associated metazoans were seen in Porites and Montipora. Findings of multiple potential etiologies for a given gross lesion highlight the importance of incorporating histopathology in coral disease surveys. This study also expands the range of corals infected with cell associated microbial aggregates.
Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by permission of Sage for personal use, not for redistribution. The definitive version was published in Veterinary Pathology 53 (2016): 153-162, doi:10.1177/0300985815571669.
Showing items related by title, author, creator and subject.
Coral biomineralization, climate proxies and the sensitivity of coral reefs to CO2-driven climate change DeCarlo, Thomas M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-02)Scleractinian corals extract calcium (Ca2+) and carbonate (CO2−3) ions from seawater to construct their calcium carbonate (CaCO3) skeletons. Key to the coral biomineralization process is the active elevation of the CO2−3 ...
Bromage, Erin; Carpenter, Lawrence; Kaattari, Stephen; Patterson, Mark (Inter-Research, 2009-02-11)The induction and regulation of heat shock proteins (hsps) is a significant defense mechanism that can preserve metabolic function and foster recovery from short-term stress events. Present coral sampling methodologies ...
Coral calcification : insights from inorganic experiments and coral responses to environmental variables Holcomb, Michael (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)Coral calcification is examined using a laboratory model and living corals. In the laboratory model, abiogenic aragonite formed at high saturation state (Ω>~20) had a granular appearance and was enriched in trace elements, ...