Evaluation of passive samplers as a monitoring tool for early warning of Dinophysis toxins in shellfish
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AuthorsPizarro, G. (Gemita); Moroño, Á. (Ángeles); Paz, B. (Beatriz); Franco, J.M. (José Mariano); Pazos, Y. (Yolanda); Reguera, B. (Beatriz)
early warning DSP outbreaks
modeling toxin accumulation
Solid Phase Adsorbing Toxin Tracking (SPATT)
From June 2006 to January 2007 passive samplers (solid phase adsorbing toxin tracking, SPATT) were tested as a monitoring tool with weekly monitoring of phytoplankton and toxin content (liquid chromatography–mass spectrometry, LC-MS) in picked cells of Dinophysis and plankton concentrates. Successive blooms of Dinophysis acuminata, D. acuta and D. caudata in 2006 caused a long mussel harvesting closure (4.5 months) in the Galician Rías (NW Spain) and a record (up to 9246 ng·g resin-week−1) accumulation of toxins in SPATT discs. Best fit of a toxin accumulation model was between toxin accumulation in SPATT and the product of cell densities by a constant value, for each species of Dinophysis, of toxin content (average) in picked cells. Detection of Dinophysis populations provided earlier warning of oncoming diarrhetic shellfish poisoning (DSP) outbreaks than the SPATT, which at times overestimated the expected toxin levels in shellfish because: (i) SPATT accumulated toxins did not include ...
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