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Ciguatera-Causing Dinoflagellate Gambierdiscus spp. (Dinophyceae) in a Subtropical Region of North Atlantic Ocean (Canary Islands): Morphological Characterization and Biogeography.
Toxins (Basel). 2019 07 19; 11(7)T

Abstract

Dinoflagellates belonging to the genus Gambierdiscus produce ciguatoxins (CTXs), which are metabolized in fish to more toxic forms and subsequently cause ciguatera fish poisoning (CFP) in humans. Five species of Gambierdiscus have been described from the Canary Islands, where CTXs in fish have been reported since 2004. Here we present new data on the distribution of Gambierdiscus species in the Canary archipelago and specifically from two islands, La Palma and La Gomera, where the genus had not been previously reported. Gambierdiscus spp. concentrations were low, with maxima of 88 and 29 cells·g-1 wet weight in samples from La Gomera and La Palma, respectively. Molecular analysis (LSUrRNA gene sequences) revealed differences in the species distribution between the two islands: only G. excentricus was detected at La Palma whereas four species, G. australes, G. caribaeus, G. carolinianus, and G. excentricus, were identified from La Gomera. Morphometric analyses of cultured cells of the five Canary Islands species and of field specimens from La Gomera included cell size and a characterization of three thecal arrangement traits: (1) the shape of the 2' plate, (2) the position of Po in the anterior suture of the 2' plate, and (3) the length-width relationship of the 2″″ plate. Despite the wide morphological variability within the culture and field samples, the use of two or more variables allowed the discrimination of two species in the La Gomera samples: G. cf. excentricus and G. cf. silvae. A comparison of the molecular data with the morphologically based classification demonstrated important coincidences, such as the dominance of G. excentricus, but also differences in the species composition of Gambierdiscus, as G. caribaeus was detected in the study area only by using molecular methods.

Authors+Show Affiliations

Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain. isabel.bravo@ieo.es.Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain.Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain.Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain.Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

31331083

Citation

Bravo, Isabel, et al. "Ciguatera-Causing Dinoflagellate Gambierdiscus Spp. (Dinophyceae) in a Subtropical Region of North Atlantic Ocean (Canary Islands): Morphological Characterization and Biogeography." Toxins, vol. 11, no. 7, 2019.
Bravo I, Rodriguez F, Ramilo I, et al. Ciguatera-Causing Dinoflagellate Gambierdiscus spp. (Dinophyceae) in a Subtropical Region of North Atlantic Ocean (Canary Islands): Morphological Characterization and Biogeography. Toxins (Basel). 2019;11(7).
Bravo, I., Rodriguez, F., Ramilo, I., Rial, P., & Fraga, S. (2019). Ciguatera-Causing Dinoflagellate Gambierdiscus spp. (Dinophyceae) in a Subtropical Region of North Atlantic Ocean (Canary Islands): Morphological Characterization and Biogeography. Toxins, 11(7). https://doi.org/10.3390/toxins11070423
Bravo I, et al. Ciguatera-Causing Dinoflagellate Gambierdiscus Spp. (Dinophyceae) in a Subtropical Region of North Atlantic Ocean (Canary Islands): Morphological Characterization and Biogeography. Toxins (Basel). 2019 07 19;11(7) PubMed PMID: 31331083.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ciguatera-Causing Dinoflagellate Gambierdiscus spp. (Dinophyceae) in a Subtropical Region of North Atlantic Ocean (Canary Islands): Morphological Characterization and Biogeography. AU - Bravo,Isabel, AU - Rodriguez,Francisco, AU - Ramilo,Isabel, AU - Rial,Pilar, AU - Fraga,Santiago, Y1 - 2019/07/19/ PY - 2019/06/24/received PY - 2019/07/16/revised PY - 2019/07/17/accepted PY - 2019/7/24/entrez PY - 2019/7/25/pubmed PY - 2020/9/1/medline KW - CFP KW - Canary Island KW - Gambierdiscus KW - benthic dinoflagellates KW - ciguatera JF - Toxins JO - Toxins (Basel) VL - 11 IS - 7 N2 - Dinoflagellates belonging to the genus Gambierdiscus produce ciguatoxins (CTXs), which are metabolized in fish to more toxic forms and subsequently cause ciguatera fish poisoning (CFP) in humans. Five species of Gambierdiscus have been described from the Canary Islands, where CTXs in fish have been reported since 2004. Here we present new data on the distribution of Gambierdiscus species in the Canary archipelago and specifically from two islands, La Palma and La Gomera, where the genus had not been previously reported. Gambierdiscus spp. concentrations were low, with maxima of 88 and 29 cells·g-1 wet weight in samples from La Gomera and La Palma, respectively. Molecular analysis (LSUrRNA gene sequences) revealed differences in the species distribution between the two islands: only G. excentricus was detected at La Palma whereas four species, G. australes, G. caribaeus, G. carolinianus, and G. excentricus, were identified from La Gomera. Morphometric analyses of cultured cells of the five Canary Islands species and of field specimens from La Gomera included cell size and a characterization of three thecal arrangement traits: (1) the shape of the 2' plate, (2) the position of Po in the anterior suture of the 2' plate, and (3) the length-width relationship of the 2″″ plate. Despite the wide morphological variability within the culture and field samples, the use of two or more variables allowed the discrimination of two species in the La Gomera samples: G. cf. excentricus and G. cf. silvae. A comparison of the molecular data with the morphologically based classification demonstrated important coincidences, such as the dominance of G. excentricus, but also differences in the species composition of Gambierdiscus, as G. caribaeus was detected in the study area only by using molecular methods. SN - 2072-6651 UR - https://www.unboundmedicine.com/medline/citation/31331083/Ciguatera_Causing_Dinoflagellate_Gambierdiscus_spp___Dinophyceae__in_a_Subtropical_Region_of_North_Atlantic_Ocean__Canary_Islands_:_Morphological_Characterization_and_Biogeography_ L2 - https://www.mdpi.com/resolver?pii=toxins11070423 DB - PRIME DP - Unbound Medicine ER -