The Effects of Selected Herbicides on Bacterial Populations in an Aquatic Environment.

摘要

A laboratory culture system was used to continuously culture mesophilic,heterotrophic bacteria derived from a freshwater reservoir. Alterations in bacterial numbers and diversity of genera were studies both before and after additions of selected herbicides. Identical techniques for isolation and identification were used to compare culturable heterotrophic bacteria from a freshwater reservoir with those in the laboratory culture system. Three chemicals,representing the phenoxyalkonic acid,substituted urea,and dipyridyl classes of herbicides,were added to circulating vat culture vessels which contained untreated reservoir water. The herbicides tested all remained qualitatively measurable in the culture system for three weeks.