Paralytic shellfish toxins in the Atlantic horse mackerel (<i>Trachurus trachurus</i>) over a bloom of <i>Gymnodinium catenatum</i>: the prevalence of decarbamoylsaxitoxin in the marine food web

Sandra Lage; Pedro Reis Costa

doi:10.3989/scimar.03701.28C

Autores/as

Sandra Lage IPMA – Instituto Português do Mar e da Atmosfera
Pedro Reis Costa IPMA – Instituto Português do Mar e da Atmosfera

DOI:

https://doi.org/10.3989/scimar.03701.28C

Palabras clave:

toxinas marinas, saxitoxina, peces pelágicos, ficotoxinas, proliferaciones de algas nocivas

Resumen

Este estudio reporta la acumulación de toxinas paralizantes de molusco (PSP) en las muestras de jurel (Trachurus trachurus) durante una proliferación do dinoflagelado Gymnodinium catenatum. Los altos niveles de toxinas PSP, alcanzando un valor máximo de 4800 μg STXeq kg^–1, se determinaron en el pico de la proliferación (5.0 10³ células l^–1). El perfil de toxinas se examinó y se reveló que los compuestos dcSTX y B1 constintuían casi 90% de las toxinas (en base molar) encontrados en las muestras de jurel. Este perfil difiere claramente del perfil de toxinas conocido en cepas de G. catenatum aisladas de la costa portuguesa, que está dominado por toxinas N-sulfocarbamoyl, en particular las toxinas C1+2. Este trabajo muestra la prevalencia de dcSTX el ambiente pelágico y la transferencia de este compuesto a través de la cadena alimentaria. El jurel se identifica como un potencial vector de las toxinas PSP a lo largo de la costa portuguesa. Esta especie de pez tiene una posición central en la cadena alimentaria marina, siendo un importante depredador de zooplancton y, al mismo tiempo un elemento importante de la dieta de los depredadores superiores. Este estudio contribuye con valores ecológicos relevantes para evaluar los potenciales impactos de las proliferaciones de dinoflagelados productores de PST en los ecosistemas marinos o sus componentes, como los peces.

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