NDLI: Variations of periphytic diatom sensitivity to the herbicide diuron and relation to species distribution in a contamination gradient: implications for biomonitoring.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Roubeix, Vincent Mazzella, Nicolas Schouler, Laurie Fauvelle, Vincent Morin, Soizic Coste, Michel Delmas, François Margoum, Christelle
Description	Country affiliation: France Author Affiliation: Roubeix V ( Cemagref, UR REBX, F-33612 Cestas Cedex, France. vincent.roubeix@cemagref.fr)
Abstract	Diatoms are commonly used as bioindicators of trophic and saprobic pollution in rivers. However, more knowledge is needed concerning their sensitivity to toxicants such as agricultural herbicides. In this study, seven species of periphytic diatoms were isolated from the Morcille River (Beaujolais area, France) which presents a streamward contamination gradient by pesticides and particularly diuron. The sensitivity of these species to diuron was assessed through ecotoxicological tests based on short-term growth inhibition of monospecific cultures. After application of an appropriate toxicological model, EC50 were determined and the species were ranked according to their tolerance. EC50 values ranged from 4.5 to 19 µg L(-1). Finally, the results were related to field periphyton samples from an upstream and a downstream site in order to check if variations in specific relative abundance between sites are consistent with differences in tolerance to diuron. Species distribution between sites was only partially in accordance with toxicological results suggesting that other factors (toxic or trophic) have an important influence on diatom communities in the river. Nevertheless, diatoms showed their potential to indicate water contamination by pesticides and toxic indices could be developed in complement to existing trophic indices.
File Format	HTM / HTML
ISSN	14640325
Issue Number	6
Volume Number	13
e-ISSN	14640333
Journal	Journal of Environmental Monitoring
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-06-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Environmental Health Diatoms Drug Effects Diuron Toxicity Herbicides Water Pollutants, Chemical Dose-response Relationship, Drug Environmental Monitoring Methods Rivers Chemistry Journal Article
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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