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Journal of Plankton Research Vol.23 no.1 pp.105-116, 2001
© Oxford University Press 2001

Paralytic Shellfish Poisoning on the East Coast of the UK in Relation to Seasonal Density-driven Circulation

J. Brown, L. Fernand, K. J. Horsburgh1, A. E. Hill2 and J. W. Read

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk, NR33 0HT, 1 School of Ocean Sciences, Marine Science Laboratories, University of Wales Bangor, Menai Bridge, YNYS Môn, ll59 5EY and 2 Proudman Oceanographic Laboratory, Bidston, Merseyside, l43 7RA, UK

Paralytic shellfish poisoning (PSP) toxin associated with the dinoflagellate Alexandrium tamarense is found on the north-east coast of the UK in late spring/early summer. Severe outbreaks are sporadic, and knowledge of the cause and origin of the phytoplankton blooms and whether they develop from a diffuse source or from a seed population is uncertain. Recent observations of the circulation of the region demonstrate a persistent southward near-coastal flow associated with strong bottom fronts bounding a pool of cold dense bottom water isolated below the seasonal (spring/summer) thermocline. Flows extend continuously for ~500 km from the Firth of Forth to Flamborough Head before passing offshore to the Dogger Bank. These observations suggest that dinoflagellates originating from the high concentrations of A. tamarense cysts in the sediment of the Firth of Forth act to maintain a dinoflagellate population in the coastal region south of Flamborough Head, thereby maintaining the rist of PSP outbreaks.


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