A system of recirculating channels was used in this study to examine the long-term effects
(29d) of environmentally realistic concentrations of the herbicide diuron (from 0.07 to 7μgL−
1) on biofilm communities. The autotrophic activity of biofilms was affected by this herbicide,
as reflected by a marked decrease in the photosynthetic efficiency. Diuron exposure also
increased chlorophyll-a content and reduced the biovolume of diatom taxa at low
concentrations. The effects on bacteria were also remarkable. Bacterial abundance was …

A system of recirculating channels was used in this study to examine the long-term effects
(29 d) of environmentally realistic concentrations of the herbicide diuron (from 0.07 to 7 μg L-
1) on biofilm communities. The autotrophic activity of biofilms was affected by this herbicide,
as reflected by a marked decrease in the photosynthetic efficiency. Diuron exposure also
increased chlorophyll-a content and reduced the biovolume of diatom taxa at low
concentrations. The effects on bacteria were also remarkable. Bacterial abundance was …