Priority Site Selection for Degraded Areas Based on Microbial and Toxicant Screening Tests

Abstract
The results of a study to evaluate the suitability of a variety of microbiological, biochemical and bioassay tests to become part of a battery of test procedures to identify degraded or degrading water bodies, are presented. Data for this study were obtained from 51 inshore sampling sites along the north shore of Lake Ontario from Kingston to Niagara River. Data examination indicated that microbial population, biochemical or bioassay tests performed independently do not provide realistic estimates of priority concern areas and that the battery approach is required. From this study the sampling sites of highest concern were: Humber River STP out fall, mouth of Mimico Creek, mouth of Credit River and Bay of Quinte near the Belleville STP outfall.

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