First insights on the diversity of the genus Ostreopsis (Dinophyceae, Gonyaulacales) in Guadeloupe Island, with emphasis on the phylogenetic position of O. heptagona

Boisnoir, Aurélie; Bilien, Gwenaël; Lemée, Rodolphe; Chomérat, Nicolas

doi:10.1016/j.ejop.2022.125875

Cited by 5 publications

(7 citation statements)

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“…To date, 11 Ostreopsis species have been taxonomically described, but molecular data suggest cryptic diversity, and some ribotypes are as yet undescribed. 22,23 Among the 11 species are those able to synthesize palytoxin (PLTX) analogs, notably ovatoxins (OVTXs), which are synthesized by Ostreopsis cf. ovata , and ostreocins, which are synthesized by Ostreopsis siamensis .…”

Section: Discussionmentioning

confidence: 99%

Impacts on Human Health Potentially Caused by Exposure to an Unprecedented Ostreopsis spp Bloom in the Bay of Biscay, French Basque Coast

Paradis,

Chomérat,

Vaucel

et al. 2024

Wilderness & Environmental Medicine

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Introduction In recent years, climate change and human activity have modified marine biotopes, including the widening distribution of harmful algal blooms (HABs). Bloom events predominated by microalgae of the genus Ostreopsis have been described on the French Mediterranean coast, but in 2021 an unprecedented bloom occurred on the French Basque coast. The objective of this study is to describe the health impact of the Ostreopsis spp bloom that occurred on the French Basque coast in 2021. Methods A historical cohort was conducted, including cases of possible exposure to Ostreopsis spp registered at the Centre Antipoison de Nouvelle-Aquitaine between July 1 and September 30, 2021. Results Of 674 patients with possible toxicity due to Ostreopsis spp, 96.9% had bathed in contaminated waters. Most of them developed respiratory tract symptoms (64.4% of patients). The time to the onset of symptoms was <6 h for 73.6% of 174 short-term (<24 h) exposed patients. The median duration of symptoms was 7.5 days for occupational (e.g., lifeguards and surfing instructors) and 3 days for recreational exposures. There were no severe cases. In total, 3% of the cases were of moderate severity, and 97% were of minor severity, according to the Poisoning Severity Score. Conclusion Toxic reactions caused by Ostreopsis spp are mostly benign. The clinical picture is similar to that described following exposures to Ostreopsis cf. ovata blooms in the Mediterranean area since the end of the 20th century. Ostreopsis spp are present on the Basque coast. The ecological factors promoting its blooms remain to be clarified.

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Section: Discussionmentioning

confidence: 99%

Impacts on Human Health Potentially Caused by Exposure to an Unprecedented Ostreopsis spp Bloom in the Bay of Biscay, French Basque Coast

Paradis,

Chomérat,

Vaucel

et al. 2024

Wilderness & Environmental Medicine

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“…To prevent confusion, some recent studies propose calling this species Ostreopsis sp. 9 [ 46 , 49 ]. This later species has been identified in New Zealand [ 55 , 56 ], Malaysia [ 119 ] and Australia’s Coral Sea, including Heron and Lady Elliot Islands, Hoffmans Rocks, and the Tasmanian Sea [ 114 , 120 ].…”

Section: Discussionmentioning

confidence: 99%

“…This analysis was based on the concatenated D1–D3 and D8–D10 domains of the large ribosomal subunit. To accomplish this, we incorporated sequences from strains OSCM17 and CMON15, along with 68 sequences from Ostreopsis (48 sequences), Coolia (15 sequences) and Alexandrium (5 sequences, serving as the outgroup), using Boisnoir’s analysis [ 49 ] as a foundation. The two regions of the LSU were initially aligned separately using the MAFFT algorithm with the q-ins-i option in Version 7 [ 108 ].…”

Section: Methodsmentioning

confidence: 99%

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Molecular Phylogeny, Morphology, Growth and Toxicity of Three Benthic Dinoflagellates Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis Developing in Strait of Gibraltar, Southwestern Mediterranean

Ibghi,

Rijal Leblad,

L’Bachir El Kbiach

et al. 2024

Toxins

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Few works have been carried out on benthic harmful algal blooms (BHAB) species in the southern Mediterranean and no data are available for the highly dynamic Strait of Gibraltar (western Mediterranean waters). For the first time, Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis were isolated in this key region in terms of exchanges between the Atlantic Ocean and the Mediterranean and subject to intense maritime traffic. Ribotyping confirmed the morphological identification of these three dinoflagellates species. Monoclonal cultures were established and the maximum growth rate and cell yield were measured at a temperature of 24 °C and an irradiance of 90 µmol photons m−2 s−1, for each species: 0.26 ± 0.02 d−1 (8.75 × 103 cell mL−1 after 28 days) for Ostreopsis sp. 9, 0.21 ± 0.01 d−1 (49 × 103 cell mL−1 after 145 days) for P. lima and 0.21 ± 0.01 d−1 (10.02 × 103 cell mL−1 after 28 days) for C. monotis. Only P. lima was toxic with concentrations of okadaic acid and dinophysistoxin-1 measured in optimal growth conditions ranging from 6.4 pg cell−1 to 26.97 pg cell−1 and from 5.19 to 25.27 pg cell−1, respectively. The toxin content of this species varied in function of the growth phase. Temperature influenced the growth and toxin content of P. lima. Results suggest that future warming of Mediterranean coastal waters may lead to higher growth rates and to increases in cellular toxin levels in P. lima. Nitrate and ammonia affected the toxin content of P. lima but no clear trend was noted. In further studies, we have to isolate other BHAB species and strains from Strait of Gibraltar waters to obtain more insight into their diversity and toxicity.

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“…Furthermore, a high degree of morphological variability exists within a given species, which makes the use of genetic methods essential for reliable identification at species level [ 17 ]. Phylogenetic studies inferred from ribosomal genes (domains of the large subunit, LSU) and intergenic transcribed spacers (ITS regions) revealed the existence of at least 13 major clades that could potentially correspond to different species [ 18 , 19 , 20 ]; however, to date, some of these genotypes have not yet been taxonomically identified owing to cryptic morphologies or a lack of morphological information [ 21 , 22 ]. Recent studies successfully clarified the taxonomic identity of some of these ribotypes [ 16 , 19 , 20 , 23 ], but such approaches are absolutely needed for the remaining genotypes to clarify the complex taxonomy of the genus.…”

Section: Introductionmentioning

confidence: 99%

First Characterization of Ostreopsis cf. ovata (Dinophyceae) and Detection of Ovatoxins during a Multispecific and Toxic Ostreopsis Bloom on French Atlantic Coast

et al. 2022

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Blooms of the benthic toxic dinoflagellate genus Ostreopsis have been recorded more frequently during the last two decades, particularly in warm temperate areas such as the Mediterranean Sea. The proliferation of Ostreopsis species may cause deleterious effects on ecosystems and can impact human health through skin contact or aerosol inhalation. In the eastern Atlantic Ocean, the toxic O. cf. ovata has not yet been reported to the north of Portugal, and the only species present further north was O. cf. siamensis, for which the toxic risk is considered low. During summer blooms of unidentified Ostreopsis species on the French Basque coast (Atlantic) in 2020 and 2021, people suffered from irritations and respiratory disorders, and the number of analyzed cases reached 674 in 2021. In order to investigate the causes, sampling was carried out during summer 2021 to (i) taxonomically identify Ostreopsis species present using a molecular approach, (ii) isolate strains from the bloom and culture them, and (iii) characterize the presence of known toxins which may be involved. For the first time, this study reports the presence of both O. cf. siamensis and O. cf. ovata, for which the French Basque coast is a new upper distribution limit. Furthermore, the presence of ovatoxins a, b, c, and d in the environmental sample and in a cultivated strain in culture confirmed the toxic nature of the bloom and allowed identifying O. cf. ovata as the producer. The present data identify a new health risk in the area and highlight the extended distribution of some harmful dinoflagellates, presumably in relation to climate change.

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First insights on the diversity of the genus Ostreopsis (Dinophyceae, Gonyaulacales) in Guadeloupe Island, with emphasis on the phylogenetic position of O. heptagona

Cited by 5 publications

References 77 publications

Impacts on Human Health Potentially Caused by Exposure to an Unprecedented Ostreopsis spp Bloom in the Bay of Biscay, French Basque Coast

Impacts on Human Health Potentially Caused by Exposure to an Unprecedented Ostreopsis spp Bloom in the Bay of Biscay, French Basque Coast

Molecular Phylogeny, Morphology, Growth and Toxicity of Three Benthic Dinoflagellates Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis Developing in Strait of Gibraltar, Southwestern Mediterranean

First Characterization of Ostreopsis cf. ovata (Dinophyceae) and Detection of Ovatoxins during a Multispecific and Toxic Ostreopsis Bloom on French Atlantic Coast

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