Demonstration of pollution effects in aquatic microcosms

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Abstract
Trophic level interactions caused by an algicide, an insecticide, and two levels of organic enrichment were demonstrated in alga‐grazer‐bacteria microcosms; e.g., the insecticide caused an algal bloom by removing grazers. The technique was expanded to develop an unbiased bioassay of the effects of low levels of HgCl2, CdCl2, Toxaphene, and Aroclor (PCB) 1242. Problems of toxicant recovery, solvent effects, repeatability, and statistical analyses were uncovered. In an algal chemostat, Aroclor 1242 generally prevented the maintenance of steady state densities.

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