Observations of Alexandrium tamarense (Dinophyceae) vegetative cells and oceanographic parameters in Scapa Flow, Orkney Islands, Scotland

Linda B. Joyce

    Research output: Contribution to journalArticle

    Abstract

    The toxic dinoflagellate Alexandrium tamarense was studied along with surrounding oceanographic parameters from May 1998 to May 1999 in Scapa Flow, Orkney. Nutrient concentrations were higher in winter and showed a phase of depletion in late spring and summer. Dinoflagellates tended to be abundant in late spring and summer. Alexandrium tamarense was detected in the water column almost year round, with the exception of the winter months (September to December). The growth of the A. tamarense population in Scapa Flow was not reflected in a monospecific bloom but rather in moderate to small biomass levels and always in co-occurrence with other species of diatoms and dinoflagellates. The highest concentration recorded was 1600 cells 1-1 but concentrations of 200-400 cells 1-1 were more typical. The oceanographi parameters indicate that the occurrences of vegetative cells of A. tamarense seem to be explained in part by instability of the water column, low temperature and low nutrient concentrations.

    Original languageEnglish
    Pages (from-to)277-282
    Number of pages6
    JournalJournal of the Marine Biological Association of the United Kingdom
    Volume85
    Issue number2
    DOIs
    Publication statusPublished - Apr 2005

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    Alexandrium
    vegetative cells
    Scotland
    Dinophyceae
    nutrient content
    winter
    Bacillariophyceae
    summer
    water
    cells
    biomass
    Miozoa
    temperature

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    title = "Observations of Alexandrium tamarense (Dinophyceae) vegetative cells and oceanographic parameters in Scapa Flow, Orkney Islands, Scotland",
    abstract = "The toxic dinoflagellate Alexandrium tamarense was studied along with surrounding oceanographic parameters from May 1998 to May 1999 in Scapa Flow, Orkney. Nutrient concentrations were higher in winter and showed a phase of depletion in late spring and summer. Dinoflagellates tended to be abundant in late spring and summer. Alexandrium tamarense was detected in the water column almost year round, with the exception of the winter months (September to December). The growth of the A. tamarense population in Scapa Flow was not reflected in a monospecific bloom but rather in moderate to small biomass levels and always in co-occurrence with other species of diatoms and dinoflagellates. The highest concentration recorded was 1600 cells 1-1 but concentrations of 200-400 cells 1-1 were more typical. The oceanographi parameters indicate that the occurrences of vegetative cells of A. tamarense seem to be explained in part by instability of the water column, low temperature and low nutrient concentrations.",
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    N2 - The toxic dinoflagellate Alexandrium tamarense was studied along with surrounding oceanographic parameters from May 1998 to May 1999 in Scapa Flow, Orkney. Nutrient concentrations were higher in winter and showed a phase of depletion in late spring and summer. Dinoflagellates tended to be abundant in late spring and summer. Alexandrium tamarense was detected in the water column almost year round, with the exception of the winter months (September to December). The growth of the A. tamarense population in Scapa Flow was not reflected in a monospecific bloom but rather in moderate to small biomass levels and always in co-occurrence with other species of diatoms and dinoflagellates. The highest concentration recorded was 1600 cells 1-1 but concentrations of 200-400 cells 1-1 were more typical. The oceanographi parameters indicate that the occurrences of vegetative cells of A. tamarense seem to be explained in part by instability of the water column, low temperature and low nutrient concentrations.

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