Abstract
An algal toxicity bioassay using a continuous culture was investigated with respect to the herbicide gardoprim (triazine) and patoran (phenylurea) in order to evaluate the effect of increasing dosages of applied herbicides upon growth, residual herbicide and herbicide accumulation in Nile water algae. Growth patterns exhibited by algae under continuous culture conditions reflect the ability of the algae to overcome inhibitory effects of the herbicides. Nile water algae showed variable ability to accumulate different herbicide. As the herbicide concentratrion increased, the accumulation increased especially for paron. Nile water algae accumulated patron and gardoprim to concentrations of 0.75 and 0.3 mg g-1, respectively. Considerable change occurred in the algal diversity and redundancy after each increase in herbicide concentration. Diversity and redundancy of genera and their recovery varied according to the type of herbicide, its concentration and contact time.
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