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dc.contributor.authorTouzet, Nicolas-
dc.contributor.authorFranco, José M.-
dc.contributor.authorRaine, Robin-
dc.identifier.citationApplied and Environmental Microbiology 73(10): 3333-3342 (2007)en_US
dc.description10 pages, 5 figures, 4 tables.en_US
dc.description.abstractA comparative analysis of the morphology, toxin composition, and ribosomal DNA (rDNA) sequences was performed on a suite of clonal cultures of the potentially toxic dinoflagellate Alexandrium minutum Halim. These were established from resting cysts or vegetative cells isolated from sediment and water samples taken from the south and west coasts of Ireland. Results revealed that strains were indistinguishable, both morphologically and through the sequencing of the D1-D2 domain of the large subunit and the ITS1-5.8S-ITS2 regions of the rDNA. High-performance liquid chromatography fluorescence detection analysis, however, showed that only strains derived from retentive inlets on the southern Irish coast synthesized paralytic shellfish poisoning (PSP) toxins (GTX2 and GTX3), whereas all strains of A. minutum isolated from the west coast were nontoxic. Toxin analysis of net hauls, taken when A. minutum vegetative cells were in the water column, revealed no PSP toxins in samples from Killary Harbor (western coast), whereas GTX2 and GTX3 were detected in samples from Cork Harbor (southern coast). These results confirm the identity of A. minutum as the most probable causative organism for historical occurrences of contamination of shellfish with PSP toxins in Cork Harbor. Finally, random amplification of polymorphic DNA was carried out to determine the degree of polymorphism among strains. The analysis showed that all toxic strains from Cork Harbor clustered together and that a separate cluster grouped all nontoxic strains from the western coast.en_US
dc.description.sponsorshipThis work was supported by the Higher Education Authority of Ireland (Department of Education and Science) (PRTLI Cycle III).en_US
dc.format.extent307788 bytes-
dc.publisherAmerican Society for Microbiologyen_US
dc.titleCharacterization of Non-Toxic and Toxin-Producing Strains of Alexandrium minutum (Dinophyceae) in Irish Coastal Watersen_US
dc.description.peerreviewedPeer revieweden_US
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