Abstract：
: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 7 microg 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 reduced after a week of exposure to the herbicide at a range of concentrations. Effects were on the number of live bacteria and on the increase in the leucine-aminopeptidase activity. It is suggested that inputs of herbicides to the river ecosystem at low concentrations may cause a chain of effects in the biofilm, which include inhibitory effects on algae but also indirect effects on the relationships between biofilm components.
journal_name
Chemospherejournal_title
Chemosphereauthors
Ricart M,Barceló D,Geiszinger A,Guasch H,de Alda ML,Romaní AM,Vidal G,Villagrasa M,Sabater Sdoi
10.1016/j.chemosphere.2009.06.017subject
Has Abstractpub_date
2009-09-01 00:00:00pages
1392-401issue
10eissn
0045-6535issn
1879-1298pii
S0045-6535(09)00708-5journal_volume
76pub_type
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