<abstract xmlns="http://www.w3.org/1999/xhtml">

As part of the routine control of the Tunisian network for the monitoring of the most problematic microalgae species <italic>Karenia selliformis</italic> and <italic>Alexandrium minutum</italic> and for the study of hydrophilic and lipophilic marine biotoxin profiles, clams and seawater samples from Boughrara lagoon were analysed during the past decade. The results showed that the abundance of <italic>Karenia selliformis</italic> and <italic>Alexandrium minutum</italic> in the Boughrara lagoon exhibited significant variability at annual scales. <italic>K. selliformis</italic> was recorded in all sampling years with interannual variability. Among the nine sampled years, 2010, 2012, 2016 and 2017 were, respectively, the most significant in terms of mean abundance (2.85, 2.42, 1.38, 1.69) ∙ 105 cells L–1. <italic>A. minutum</italic> species were observed in the water column during all investigated years except in 2013, 2016 and 2017, but in low concentrations compared to <italic>K. selliformis</italic> (≤ 7.4 ∙ 102 cells L–1). Using LC-FLD, traces of paralytic toxins (C1 and GTX-2) were detected in some clam samples. Their concentrations were largely below the regulatory limit. For the first time, N-sulfocarbamoyl gonyautoxin-2 (C-1) and gonyautoxin 2 (GTX-2) were detected in some clam samples from this region. LC-MS/MS analysis confirmed the presence of gymnodimines in some samples. The main peak corresponds to the GYM-A with high concentrations generally above 1 mg kg–1 of clams meat, which confirms the persistence of this neurotoxin in Boughrara lagoon.
</abstract>

As part of the routine control of the Tunisian network for the monitoring of the most problematic microalgae species Karenia selliformis and Alexandrium minutum and for the study of hydrophilic and lipophilic marine biotoxin profiles, clams and seawater samples from Boughrara lagoon were analysed during the past decade. The results showed that the abundance of Karenia selliformis and Alexandrium minutum in the Boughrara lagoon exhibited significant variability at annual scales. K. selliformis was recorded in all sampling years with interannual variability. Among the nine sampled years, 2010, 2012, 2016 and 2017 were, respectively, the most significant in terms of mean abundance (2.85, 2.42, 1.38, 1.69) ∙ 105 cells L–1. A. minutum species were observed in the water column during all investigated years except in 2013, 2016 and 2017, but in low concentrations compared to K. selliformis (≤ 7.4 ∙ 102 cells L–1). Using LC-FLD, traces of paralytic toxins (C1 and GTX-2) were detected in some clam samples. Their concentrations were largely below the regulatory limit. For the first time, N-sulfocarbamoyl gonyautoxin-2 (C-1) and gonyautoxin 2 (GTX-2) were detected in some clam samples from this region. LC-MS/MS analysis confirmed the presence of gymnodimines in some samples. The main peak corresponds to the GYM-A with high concentrations generally above 1 mg kg–1 of clams meat, which confirms the persistence of this neurotoxin in Boughrara lagoon.

Marine Biotoxin Profile and <italic>Karenia selliformis</italic> and <italic>Alexandrium minitum</italic> Occurrence in Boughrara Lagoon During the Last Decade

Laboratoire des Venins et Biomolécules Thérapeutiques

Institut Pasteur de Tunis, Université Tunis El Manar

Ecological Chemistry and Engineering S

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Marine Biotoxin Profile and  and  Occurrence in Boughrara Lagoon During the Last Decade

As part of the routine control of the Tunisian network for the monitoring of the most problematic microalgae species Karenia selliformis and Alexandrium...

Marine Biotoxin Profile and Karenia selliformis and Alexandrium minitum Occurrence in Boughrara Lagoon During the Last Decade

Publié en ligne: 14 janv. 2023

Pages: 501 - 510

DOI: https://doi.org/10.2478/eces-2022-0037

Mots clés
clams, toxicity, PSTs, GYM-A,

© 2022 Riadh Marrouchi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Marine Biotoxin Profile and Karenia selliformis and Alexandrium minitum Occurrence in Boughrara Lagoon During the Last Decade

Publié en ligne: 14 janv. 2023

Pages: 501 - 510

DOI: https://doi.org/10.2478/eces-2022-0037

Mots clésclams, toxicity, PSTs, GYM-A,

© 2022 Riadh Marrouchi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
clams, toxicity, PSTs, GYM-A,