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Science 2 February 1973:
Vol. 179. no. 4072, pp. 480 - 483
DOI: 10.1126/science.179.4072.480
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Articles

Lower pH Limit for the Existence of Blue-Green Algae: Evolutionary and Ecological Implications

Thomas D. Brock 1

1 Department of Bacteriology, University of Wisconsin, Madison 53706

Observations on a wide variety of acidic environments, both natural and man-made, reveal that blue-green algae (Cyanophyta) are completely absent from habitats in which the pH is less than 4 or 5, whereas eukaryotic algae flourish. By using enrichment cultures with inocula from habitats of various pH values, the absence of blue-green algae at low pH was confirmed.


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