Abstract
The effects of varying concentrations of known environmental variables around marine domestic outfall sewers were studied on four species of polychaetous annelids which have been employed as indicators of varying degrees of marine pollution. The variables included increased concentrations of phosphates, nitrates, and silicates and decreased concentrations of chlorinity and dissolved oxygen. These factors were measured individually, the 3 nutrients together, and all 5 variables together. Data were expressed in the form of 28 day tl m values. Nereis grúbei, the healthy zone indicator, was most sensitive species studied. In general, the tolerances of the two semi healthy zone indicators and polluted zone indicator were similar. Comparisons of the 28 day tl m values with the concentrations of these factors present at the bubble of the Orange County, California, outfall sewer showed that these four species would be unaffected directly by the altered conditions in the waste discharge.
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