کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4412157 1307626 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of low concentrations of the phenylurea herbicide diuron on biofilm algae and bacteria
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Effects of low concentrations of the phenylurea herbicide diuron on biofilm algae and bacteria
چکیده انگلیسی
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 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 76, Issue 10, September 2009, Pages 1392-1401
نویسندگان
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