Paralytic shellfish toxins in Peruvian scallops associated with blooms of Alexandrium ostenfeldii (Paulsen) Balech & Tangen in Paracas Bay, Peru

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Botero-Coy A.M.
Hernández F.
Nieto-Juárez J.I.
Torres-Palma R.A.
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Elsevier Ltd
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In recent years, dense Alexandrium ostenfeldii blooms have been reported in different coastal areas. In this study, we report for the first time the occurrence of A. ostenfeldii blooms associated with the detection of paralytic shellfish toxins (PSTs) in the Peruvian scallop (Argopecten purpuratus) from Paracas Bay. Alexandrium ostenfeldii blooms occurred at the end of summer and early fall, after the increase of riverine input and under stratified conditions following a decrease in wind velocity. The highest abundances occurred during warm sea surface temperatures (18–27 °C). High PST concentrations that exceed the maximum permissible level (800 ?g STX eq. kg?1) occurred even under low A. ostenfeldii abundances (20 × 103 cells l?1). Our results contribute to a better understanding of the dynamics of A. ostenfeldii in coastal systems influenced by riverine inputs and upwelling and can be used to improve monitoring programs and allow the implementation of mitigation measures along the Peruvian coast. © 2021 Elsevier Ltd
T. Cuellar-Martinez acknowledges the financial support of the Project Concytec - World Bank ?Characterization and forecast of extreme events in the Peruvian sea using an operational system of oceanic information? (05-2019-FONDECYT-BM), through its executing unit Fondo Nacional de Desarrollo Cient?fico, Tecnol?gico y de Innovaci?n Tecnol?gica (Fondecyt). This work is a contribution to the cooperative agreement between the Instituto del Mar del Per? (IMARPE) and the Institut de Recherche pour le Developpement (IRD) through the IRD international network GDRI DEXICOTROP and the JEAI DYSRUP. The authors thank to: L. Ycochea for toxin data, A. Lorenzo Puitiza for data from IMARPE-PISCO laboratory, A. E. Franco Garc?a for the environmental data.
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