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Ostreopsis cf. ovata blooms in the NW Mediterranean: Exploring the links between toxins variability and impacts on human health

AuthorsBerdalet, Elisa ; Moyano, Encarnación; Abós-Herràndiz, Rafael; Alechaga, Élida; Àlvarez, Josep; Estrada, Marta ; Farràs, Jaume; Isern-Fontanet, Jordi ; Sánchez-Pardo, Josep ; Viure Feliu, Laia ; Vila, Magda
Issue Date14-Mar-2017
CitationPhycotox2017: Conference annuelle GdR Phycotox - GIS Cyano (2017)
AbstractBlooms of the benthic dinoflagellate Ostreopsis cf. ovata are recurrent in Sant Andreu de Llavaneres beach (40 km North of Barcelona, NW Mediterranean) along the summer-fall season. In this locality, respiratory symptoms and general malaise in people exposed to marine aerosols are reported during the yearly microalgal bloom period. In addition, macrofauna seems also to be negatively affected by the presence of Ostreopsis. Within the OstreoRisk project (2015-2017) we are characterizing the variability of Ostreopsis-related toxins (ovatoxins and palytoxins) along the bloom development period, in order to ascertain their role on the human and environmental health impacts in the area. Concurrently, epidemiological follow-up studies are conducted on the inhabitants of residences located in front of the Ostreopsis hot spot. The blooms last for at least 2 months, with high numbers until the end of September. However, impacts on human health tend to peak at the transition from the exponential to the stationary phase of the bloom, usually between the end of July and early August. In the summer of 2015, total toxin intracellular concentrations maxima were also detected within that period (up to 300 - 700 pg·cell-1), while along the rest of the bloom season the values were below 30 pg·cell-1. On average, ovatoxin a (OVTX-a) accounted for 75% of the total toxin content, followed by OVTX-b (22%), while OVTXs c to g and isobaric palytoxin (PLTX) were minor components. PLTX (corresponding to < 0.5% of the total toxin content) was rarely detected, coinciding with the peaks in total toxin content and O. cf. ovata cell abundances (ca. 7-10·105 cells·g-1 of macroalgae fresh weight). With the technical approaches used, toxins have not been detected in the aerosol. Our next steps include the chemical characterization of aerosols and ecotoxicology tests on model organisms
DescriptionPhycotox2017: Conference annuelle GdR Phycotox - GIS Cyano sur les microalgues et cyanobactéries toxiques, 14-16 mars 2017, Gif Sur Yvette, France
Appears in Collections:(ICM) Comunicaciones congresos
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