Field observations of the dinoflagellate genus Azadinium and azaspiracid toxins in the south-west Atlantic Ocean
Elena Fabro A B D , Gastón O. Almandoz A B , Bernd Krock C and Urban Tillmann C
+ Author Affiliations
- Author Affiliations
A División Ficología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n (B1900FWA), La Plata, Argentina.
B Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, 1033 Buenos Aires, Argentina.
C Alfred Wegener Institut-Helmholtz Zentrum für Polar- und Meeresforschung, Chemische Ökologie, Am Handelshafen 12, D-27570 Bremerhaven, Germany.
D Corresponding author. Email: fabroelena@yahoo.com.ar
Marine and Freshwater Research 71(7) 832-843 https://doi.org/10.1071/MF19124
Submitted: 6 April 2019 Accepted: 27 August 2019 Published: 13 November 2019
Abstract
Some dinoflagellate species of the genera Azadinium and Amphidoma (Amphidomataceae) produce azaspiracids (AZA), a group of toxins responsible for gastrointestinal disorders in humans following the consumption of contaminated shellfish. In this study, we investigated the diversity, distribution and abundance of Azadinium and AZA from field plankton samples collected during four oceanographic expeditions that covered an extended area of the Argentine Sea during different seasons. Scanning electron microscopy analyses indicated the presence of five Azadinium species: Az. dexteroporum, Az. luciferelloides, Az. obesum, Az. asperum and Az. cf. poporum. Azadinium-like cells were frequently found and were even an abundant component of plankton assemblages, showing a wide latitudinal distribution, from ~38 to ~55.5°S, and occurring in a wide temperature and salinity range. High cell densities (up to 154 000 cells L–1) occurred in northern slope and external shelf waters during spring. AZA-2 was detected in net samples from the 20- to 200-µm fractions by tandem mass spectrometry–liquid chromatography analysis, suggesting a transfer of AZA through the food web. Our results contribute to the knowledge of the worldwide occurrence of Azadinium species and AZA, and highlight the importance of amphidomatacean species as a potential source of AZA shellfish poisoning in the south-west Atlantic Ocean.
Additional keywords: Azadinium asperum, Azadinium dexteroporum, Azadinium luciferelloides, Azadinium obesum, Azadinium cf. poporum, azaspiracid-2.
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