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Effects of low concentrations of the phenylurea herbicide diuron on biofilm algae and bacteria

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. © 2009 Elsevier Ltd. All rights reserved

This study was supported by the European Commission project Modelkey (Project 511237-2 GOCE). Additional funds were provided by the European Project Keybioeffects (MRTN-CT-2006-035695) and by the Spanish Ministry of Science and Technology (Project GCL2006-12785/HID) and the VIECO program (009/RN08/011) of the Spanish Ministry of the Environment and Rural and Marine Affairs

© Chemosphere, 2009, vol. 76, p. 1392-1401

Elsevier

Autor: Ricart Viladomat, Marta
Barceló i Cullerés, Damià
Geiszinger, Anita
Guasch i Padró, Helena
López de Alda, Miren
Romaní i Cornet, Anna M.
Vidal, Gemma
Villagrasa, Marta
Sabater, Sergi
Data: 1 setembre 2009
Resum: 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. © 2009 Elsevier Ltd. All rights reserved
This study was supported by the European Commission project Modelkey (Project 511237-2 GOCE). Additional funds were provided by the European Project Keybioeffects (MRTN-CT-2006-035695) and by the Spanish Ministry of Science and Technology (Project GCL2006-12785/HID) and the VIECO program (009/RN08/011) of the Spanish Ministry of the Environment and Rural and Marine Affairs
Format: application/pdf
ISSN: 0045-6535
Accés al document: http://hdl.handle.net/10256/12728
Llenguatge: eng
Editor: Elsevier
Col·lecció: MICYT/2006-2009/CGL2006-12785/HID
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.chemosphere.2009.06.017
Articles publicats (D-CCAA)
És part de: © Chemosphere, 2009, vol. 76, p. 1392-1401
Drets: Tots els drets reservats
Matèria: Biofilms
Plaguicides -- Aspectes ambientals
Pesticides -- Environmental aspects
Bacteris
Bacteria
Títol: Effects of low concentrations of the phenylurea herbicide diuron on biofilm algae and bacteria
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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