Toxicity of pH,heavy metals and bisulfite to a freshwater green alga |
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Authors: | MD Baker CI Mayfield WE Inniss PTS Wong |
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Institution: | Department of Biology, University of Waterloo Waterloo, Ontario, Canada, N2L 3G1;Great lakes Fisheries Research Branch Canada Centre for Inland Waters Burlington, Ontario, Canada, L7R 4A6 |
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Abstract: | Low pH markedly reduced the growth and photosynthetic activity of an sp. The alga could not grow at pH 3 and only slight growth occurred at pH 4. The alga grew well above pH 4 with maximum growth occurring at pH 6. The fixation of 14CO2 followed a similar pattern with pH. The algal cells were also sensitive to mercury and bisulfite in acidic conditions. Algal growth and photosynthesis were reduced by mercury and bisulfite more at pH 5 than at pH 7. Lead was relatively non-toxic to the algal cells at both pH levels. Bisulfite inhibited the membrane transport of α-amino-14C-isobutyric acid at pH 5 but not at pH 7. The results suggest that algal growth and activity may be reduced in acidic lakes by low pH and that the toxicity of mercury and bisulfite is enhanced in acidic conditions. |
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