Effect of total dissolved solids and irradiance on growth and toxin production by Nodularia spumigena

P. Hobson, M. Burch, H. J. Fallowfield

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    17 Citations (Scopus)

    Abstract

    The objective of this work was to determine the influence of total dissolved solids/salinity (TDS mg L-1) on growth and biomass specific rates of nodularin (hepatotoxin) production by Nodularia spumigena 001E isolated from Lake Alexandrina, South Australia. Maximum biomass yield (dry matter, chlorophyll a and particulate organic carbon/POC) at 80 μmol photon m-2 s-1 was recorded at 3300 mg TDS L-1 and decreased at salinities above or below this value (p < 0.05). The maximum biomass yield (dry matter and chlorophyll a) at 30 μmol m-2 s-1 occurred at a higher salinity of 9900 mg TDS L-1. Cultures grown at 80 μmol m-2 s-1, at a TDS > 6600 mg L-1, had significantly (p < 0.05) lower nodularin content (ml-1 medium) than cultures grown at the same salinities at 30 μmol m-2 s-1. The maximum total toxin concentration (mL-1 medium) occurred at 9900 and 3300 mg TDS L-1 at 30 μmol m-2 s-1 and 80 μmol m-2 s-1 respectively. Toxin per unit biomass, expressed as dry matter, chlorophyll a and POC was similar for cultures grown at 30 μmol m-2 s-1 or 80 μmol m-2 s-1 at salinities < 6600 mg TDS L-1. At salinities > 9900 mg TDS L-1 the toxin content per unit biomass decreased at both irradiances, however, cultures grown at 30 μmol m-2 s-1 had a higher toxin content than those grown at 80 μmol m-2 s-1. The results indicate that not only do changes in irradiance and salinity directly influence growth and toxin production but that changes in irradiance affected the influence of salinity.

    Original languageEnglish
    Pages (from-to)551-558
    Number of pages8
    JournalJournal of Applied Phycology
    Volume11
    Issue number6
    DOIs
    Publication statusPublished - 1 Dec 1999

    Keywords

    • Growth
    • Hepatotoxin production
    • Irradiance
    • Nodularia
    • Nodularin
    • Salinity

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