Summer dynamics of Alexandrium ostenfeldii (Dinophyceae) and spirolide toxins in Cork Harbour, Ireland
| Autor: | Robin Raine, Nicolas Touzet, Majella Maher, E. Turrell, J. P. Lacaze |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
natural-populations
hab Population coastal waters Aquatic Science spatt dinoflagellate medicine.disease_cause whole-cell fish Algal bloom alexandrium Aquatic plant Botany Phytoplankton medicine education Ecology Evolution Behavior and Systematics Shellfish harmful algal bloom fish global clade education.field_of_study Ecology biology Toxin phylogenetic analysis tamarense ribosomal-rna Plankton biology.organism_classification spirolides shellfish toxins cork harbour minutum dinophyceae fluorescent in situ hybridisation solid-phase adsorption toxin tracking Dinophyceae |
| Zdroj: | Marine Ecology Progress Series. 425:21-33 |
| ISSN: | 1616-1599 0171-8630 |
| DOI: | 10.3354/meps08983 |
| Popis: | Proliferations of toxic Alexandrium spp. have adversely affected the shellfish aquacul- ture industry worldwide. A. ostenfeldii can produce several biotoxins, including the recently charac- terised fast-acting toxins spirolides (SPX). A dual labelling fluorescent in situ hybridisation (FISH) assay was developed for discriminating simultaneously between the closely related taxa A. osten- feldii and A. peruvianum. Surveys were undertaken throughout the summers of 2006, 2007 and 2008 in Cork Harbour, Ireland, where a mixed community of Alexandrium spp. develops annually. A. peruvianum was not detected but the presence of A. ostenfeldii was confirmed by FISH and mor- phological analysis. The species never reached high concentrations (max. ~200 cells l -1 ) and con- tributed on average to only 0.4% of the Alexandrium community, usually dominated by A. minutum and A. tamarense (Group III). Although cell concentrations were several orders of magnitude lower, the dynamics of A. ostenfeldii were similar to those of other Alexandrium spp. during the 3 consecu- tive summers, suggesting a common response to environmental forcing. Analytical chemistry per- formed on extracts from passive solid-phase adsorption samplers identified lipophilic toxins domi- nated by okadaic acid, but also 13-desmethyl SPX C and 20-methyl SPX G, with dynamics generally congruent with those of A. ostenfeldii. The passive samplers enabled the quantification of back- ground toxin levels at very low A. ostenfeldii concentrations, showing potential for forecasting of toxic events. The ability to quantify toxic A. ostenfeldii cells within high density microalgal popula- tions of morphologically similar species makes the dual FISH assay valuable for phytoplankton moni- toring programs and future biogeographical and population dynamics studies. |
| Databáze: | OpenAIRE |
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