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Gross and microscopic pathology of hard and soft corals in New Caledonia

July 8, 2014

We surveyed the reefs of Grande Terre, New Caledonia, for coral diseases in 2010 and 2013. Lesions encountered in hard and soft corals were systematically described at the gross and microscopic level. We sampled paired and normal tissues from 101 and 65 colonies in 2010 and 2013, respectively, comprising 51 species of corals from 27 genera. Tissue loss was the most common gross lesion sampled (40%) followed by discoloration (28%), growth anomalies (13%), bleaching (10%), and flatworm infestation (1%). When grouped by gross lesions, the diversity of microscopic lesions as measured by Shannon–Wiener index was highest for tissue loss, followed by discoloration, bleaching, and growth anomaly. Our findings document an extension of the range of certain diseases such as Porites trematodiasis and endolithic hypermycosis (dark spots) to the Western Pacific as well as the presence of a putative cnidarian endosymbiont. We also expand the range of species infected by cell-associated microbial aggregates, and confirm the trend that these aggregates predominate in dominant genera of corals in the Indo-Pacific. This study highlights the importance of including histopathology as an integral component of baseline coral disease surveys, because a given gross lesion might be associated with multiple potential causative agents.

Citation Information

Publication Year 2014
Title Gross and microscopic pathology of hard and soft corals in New Caledonia
DOI 10.1016/j.jip.2014.05.007
Authors Thierry M. Work, Greta S. Aeby, Gregory Lasne, Aline Tribollet
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Invertebrate Pathology
Index ID 70115923
Record Source USGS Publications Warehouse
USGS Organization National Wildlife Health Center

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