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A mixed community composed of a non-toxic form of Alexandrium tamarense and aparalytic shellfish poisoning (PSP) toxin-producing A. minutum develops on an annual basis in CorkHarbour, Ireland. The understanding of the ecological mechanisms that influence the populationdynamics of these bloom-forming species is fragmentary, partly due to the difficulty in the discriminationbetween Alexandrium species in mixed phytoplankton assemblages by conventional lightmicroscopy. During 2 surveys carried out in the estuary in July and September 2005, taxon-specificlarge subunit rRNA targeted probes were used in a whole-cell fluorescent in situ hybridisation assayto facilitate the detection and quantification of Alexandrium spp. in seawater samples. The Alexandriumspp. concentrations derived with molecular probes were on average half those obtained usingan Utermöhl sedimentation chamber and calcofluor. Results showed the dominance of A. tamarenseover A. minutum in July and an almost exclusive presence of A. minutum in September. Alexandriumspp. did not quantitatively dominate the total dinoflagellate assemblage and cell concentrations werelower than those found in bloom situations, nonetheless reaching more than 1 × 104 cells l–1 locally onboth occasions. The PSP toxins GTX3 and GTX2 were detected in all field samples, concentrationsbeing associated with greater abundances of A. minutum in September. Despite probable inaccuraciesinherent in the sampling methodology, the estimated intracellular toxin quotas in A. minutumwere higher in the areas of the estuary that connected different water bodies and where cells may besubjected to regimes of high turbulence and rapid changes of salinity and temperature.Versión del editor2,393

PSP toxin analysis and discrimination of the naturally co-occurring Alexandrium tamarense and A. minutum (Dinophyceae) in Cork Harbour, Ireland