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Dinoflagellates in the genus  Gambierdiscus  are known to produce potent neurotoxins known as ciguatoxins. These toxins vector through the food web and can reach sufficiently high levels to cause ciguatera fish poisoning (CFP). In many regions of the Caribbean, little is known about the occurrence of CFP-causing species or the incidence of CFP, despite its apparent regional increase over the last few decades. Given the intraspecific variability in content and potencies of these toxins among  Gambierdiscus  species, the precise identification of local species of this genus is crucial. In this study we confirm the presence of the epibenthic dinoflagellate  Gambierdiscus caribaeus  in the Colombian continental Caribbean. Cells were collected in seagrass beds of  Thalassia testudinum  in Bonito Gordo, a site located on the western side of Bahía Concha, Tayrona National Natural Park, near the city of Santa Marta, Colombia. Subsequently, a single strain of  Gambierdiscus  could be established for further identification. Morphological (light and scanning electron microscopy), and molecular results (partial LSU and ITS rDNA sequencing) were consistent with the original description of  G. caribaeus,  as well as with the morphological characteristics shown by other authors in organisms obtained near the sampling area.

botanica marina

Morphological and molecular characterization of  Gambierdiscus caribaeus  (Dinophyceae), with a confirmation of its occurrence in the Colombian Caribbean Tayrona National Natural Park