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Science 3 March 1978:
Vol. 199. no. 4332, pp. 971 - 973
DOI: 10.1126/science.199.4332.971
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Articles

Blue-Green Algal Inhibition of Diatom Growth: Transition from Mesotrophic to Eutrophic Community Structure

KATHLEEN IRWIN KEATING 1

1 Department of Environmental Science, Rutgers University—Cook Campus, New Brunswick, New Jersey 08903

Cell-free filtrates of axenic or bacterized cultures of the dominant blue-green algae from a freshwater lake inhibited the growth of diatoms isolated from the same lake. Lake waters, collected during blue-green algal blooms, also inhibited diatom growth. In situ observations over a 5-year period indicate that diatom bloom populations vary inversely with the levels of the preceding blue-green algal populations. Blue-green algal dominance of eutrophic lakes is attributed to this allelopathy, and dilution is proposed as one cause for the limited occurrence of blue-green alga dominance in marine waters.

Submitted on July 28, 1977
Revised on October 19, 1977


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