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A scuticociliate causes mass mortality of in the Caribbean Sea. | LitMetric

Echinoderm mass mortality events shape marine ecosystems by altering the dynamics among major benthic groups. The sea urchin , virtually extirpated in the Caribbean in the early 1980s by an unknown cause, recently experienced another mass mortality beginning in January 2022. We investigated the cause of this mass mortality event through combined molecular biological and veterinary pathologic approaches comparing grossly normal and abnormal animals collected from 23 sites, representing locations that were either affected or unaffected at the time of sampling. Here, we report that a scuticociliate most similar to was consistently associated with abnormal urchins at affected sites but was absent from unaffected sites. Experimentally challenging naïve urchins with a culture isolated from an abnormal, field-collected specimen resulted in gross signs consistent with those of the mortality event. The same ciliate was recovered from treated specimens postmortem, thus fulfilling Koch's postulates for this microorganism. We term this condition scuticociliatosis.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10115408PMC
http://dx.doi.org/10.1126/sciadv.adg3200DOI Listing

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