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Effects of lead on growth of the marine diatom skeletonema costatum



Effects of lead on growth of the marine diatom skeletonema costatum



Marine Biology (Berlin) 50(3): 239-248



The growth rate and maximum yield of S. costatum (Grev.) Cleve in batch culture were inhibited by dissolved Pb at concentrations of 0.05-10.0 .mu.g Pb 1-1. Growth rate, maximum yield and respiration cell-1 decreased and photosynthesis cell-1 and cell volume increased in response to increased Pb concentration in the medium. At 0.1 and 1.0 .mu.g Pb 1-1, the chlorophyll a: C and protein: C ratios did not significantly differ from the control and the increased cellular chlorophyll a, C and protein observed at these concentrations reflect an increased cell volume. At 10.0 .mu.g Pb 1-1, associated with an increase in cell volume, the chlorophyll a: C ratio was significantly lower and the protein: C ratio was significantly higher than in the control, reflecting a changed cellular chemical composition. The rates of cell division and dark respiration decreased relative to photosynthesis and to C and protein production, resulting in an alteration of the cellular chemical composition.

Accession: 005311476

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DOI: 10.1007/bf00394205

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