Response of algae and zooplankton to C18 fatty acids of Chlamydomonas reinhardtii
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Three C18 fatty acids were assayed for their activity against a number of algae and zooplankton. The three acids, lenolenic, lenoleic, and oleic, reduced the growth of Haematococcus lacustris, Synechococcus leopoliensis, and Botrydiopsis alpina by 50% of control growth in concentrations below 7 ppm. Calanoid and cyclopoid copepods in mixed cultures inoculated with lenolenic and lenoleic acid had LD50 values below 10 ppm. An increase in copepod mortality was observed with increases in cyclopoid density and decreased with increases in calanoid density. Eucyclops agilis inoculated with lenolenic acid had a LD50 value of 4 ppm.
Keywordsalgal inhibition copepod fatty acids allelopathy
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