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Acta Botanica Croatica, Vol. 72 No. 1, 2013.

Original scientific paper

https://doi.org/10.2478/v10184-012-0004-x

Pseudo-nitzschia Peragallo (Bacillariophyceae) diversity and domoic acid accumulation in tuberculate cockles and sweet clams in M’diq Bay, Morocco

Benlahcen Rijal Leblad ; Laboratoire de Phytoplancton, Institut National de Recherche Halieutique, 90000 Tanger, Morocco; Faculté des Sciences et Techniques, Université Abdelmalek Essadi, Tanger, Morocco
Nina Lundholm ; The Natural History Museum of Denmark; Sølvgade 83S; DK-1307 Copenhagen, Denmark
Didier Goux ; CMABio, Université de Caen Basse-Normandie, 14032 Caen, France
Benoit Veron ; UMR 100 PE2M, Université de Caen Basse-Normandie, 14032 Caen, France
Regia Sagou ; Laboratoire des Biotoxines, Institut National de Recherche Halieutique, Casablanca, Morocco
Hamid Taleb ; Laboratoire des Biotoxines, Institut National de Recherche Halieutique, Casablanca, Morocco
Hassan Nhhala ; Laboratoire de Phytoplancton, Institut National de Recherche Halieutique, 90000 Tanger, Morocco
Hassan Er-Raioui ; Faculté des Sciences et Techniques, Université Abdelmalek Essadi, Tanger, Morocco

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Abstract

The diversity of Pseudo-nitzschia (Bacillariophyceae) and accumulation of the neurotoxin domoic acid (DA) in two types of shellfish; tuberculate cockles (Acanthocardia tuberculata) and sweet clams (Challista chione) was explored in M’diq Bay,Morocco during 2007. The highest abundances of Pseudo-nitzschia were found during the period from March to October, with peaks occurring in May and September. Toxin analysis showed an accumulation of domoic acid in shellfish sampled during spring and autumn. The maximum toxin concentration was 4.9 mg DAg–1 of the whole tissue recorded in sweet clam during spring. Using transmission electron microscopy, thirteen Pseudo-nitzschia species were identified, eight of which are known as producers of domoic acid: P. multistriata, P. cuspidata, P. galaxiae, P. multiseries, P. pseudodelicatissima, P. pungens var. aveirensis, P. calliantha and P. fraudulenta. The five non- toxic species observed were P. subpacifica, P. arenysensis, P. dolorosa, P. subfraudulenta, and P. cf. caciantha.

Keywords

Diatoms; domoic acid; phytoplankton; Pseudo-nitzschia; shellfish; Morocco

Hrčak ID:

100055

URI

https://hrcak.srce.hr/100055

Publication date:

2.4.2013.

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