title: Influence of environmental factors on the paralytic shellfish toxin content and profile of Alexandrium catenella (Dinophyceae) isolated from the Mediterranean Sea.
abstract: Laboratory experiments were designed to study the toxin content and profile of the Alexandrium catenella strain ACT03 (isolated from Thau Lagoon, French Mediterranean) in response to abiotic environmental factors under nutrient-replete conditions. This dinoflagellate can produce various paralytic shellfish toxins with concentrations ranging from 2.9 to 50.3 fmol/cell. The toxin profile was characterized by carbamate toxins (GTX3, GTX4 and GTX5) and N-sulfocarbamoyl toxins (C1, C2, C3 and C4). C2 dominated at 12-18 °C, but only for salinities ranging from 10 to 25 psu, whereas GTX5 became dominant at temperatures ranging from 21 to 30 °C at almost all salinities. There was no significant variation in the cellular toxin amount from 18 °C to 27 °C for salinities ranging between 30 and 40 psu. At salinities of 10 to 25 psu, the toxin concentrations always remained below 20 fmol/cell. Toxin content was stable for irradiance ranging from 10 to 70 μmol photons/m2/s then slightly increased. Overall, the toxin profile was more stable than the toxin content (fmol/cell), except for temperature and/or salinity values different from those recorded during Alexandrium blooms in Thau Lagoon.
authors.affiliation: Université Montpellier 2, Centre National de Recherche Scientifique, Université Montpellier 1, IFREMER, IRD, UMR 5119 Ecologie des Systèmes Marins Côtiers, Place E. Bataillon, CC093, 34095 Montpellier cedex 5, France. mohamed.laabir@univ-montp2.fr
authors.forename: Mohamed
authors.initials: M
authors.lastname: Laabir
authors.forename: Yves
authors.initials: Y
authors.lastname: Collos
authors.forename: Estelle
authors.initials: E
authors.lastname: Masseret
authors.forename: Daniel
authors.initials: D
authors.lastname: Grzebyk
authors.forename: Eric
authors.initials: E
authors.lastname: Abadie
authors.forename: Véronique
authors.initials: V
authors.lastname: Savart
authors.forename: Manoella
authors.initials: M
authors.lastname: Sibat
authors.forename: Zouher
authors.initials: Z
authors.lastname: Amzil
mesh_terms: D004141:Dinoflagellida / Q000378:metabolism*; D004784:Environmental Monitoring; D008387:Marine Toxins / Q000737:chemistry* / Q000302:isolation & purification; D008522:Mediterranean Sea; D054712:Salinity; D057096:Shellfish Poisoning / Q000209:etiology; D013696:Temperature
chemical_list: D008387:Marine Toxins