Population dynamics and spirolide composition of the toxigenic dinoflagellate Alexandrium ostenfeldii in coastal embayments of Nova Scotia

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Proceedings titleProceedings of the Ninth International Conference on Harmful Algal Blooms, Hobart, Australia, Feb. 7-11, 2000
ConferenceThe Ninth International Conference on Harmful Algal Blooms, Feb. 7-11, 2000, Hobart, Australia
AbstractSpirolides are pharmacologically active macrocyclic imines discovered in plankton size-fractions and shellfish from the eastern toast of Nova Scotia, Canada. The gonyaulacoid dinoflagellate Alexandrium ostenfeldii was recently found to be the cause of spirolide toxicity. Analysis by liquid chromatography-mass spectrometry (LC-MS) showed that spirolide profiles were similar over time and depth within a site, but composition was markedly different among sites. The spatio-temporal distribution of spirolides in the water column is usually confïned to late spring (May and June), following the decline in the spring diatom bloom. Highest spirolide concentrations were found in the 26-56 pm plankton size- fractions, during periods when large (>20 pm) thecate dinoflagellates, such as Alexandrium, Dinophysis. Gonyaulax and Scrippsiella, were dominant. Spirolide concentrations in plankton at Graves Shoal were highly correlated with abundance of cells of Alexandrium spp. (r2=0.93), but attribution to A . ostenfeldii was complicated by the co-occurrence of A. tamarense, a morphologically similar species that does not produce spirolides.
Publication date
PublisherInternational Oceanographic Commission (UNESCO)
AffiliationNRC Institute for Marine Biosciences; National Research Council Canada
Peer reviewedYes
NPARC number23001116
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Record identifiera8a2afe1-628d-4a44-9454-edce70e00bed
Record created2016-12-13
Record modified2016-12-13
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