NDLI: Low exposure levels of urban metals induce heterotrophic community tolerance: a microcosm validation.

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Low exposure levels of urban metals induce heterotrophic community tolerance: a microcosm validation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Fechner, Lise C. Gourlay-Francé, Catherine Tusseau-Vuillemin, Marie-Hélène
Description	Country affiliation: France Author Affiliation: Fechner LC ( Cemagref-Unité de Recherche Hydrosystèmes et Bioprocédés, Parc de Tourvoie, BP 44, 92163, Antony Cedex, France. lise.fechner@cemagref.fr)
Abstract	The biological response of periphyton chronically exposed to metals of urban origin (Cd, Ni and Zn) was investigated with a Pollution-Induced Community Tolerance (PICT) approach using a previously developed short-term toxicity test based on ß-glucosidase (heterotrophic) activity. Periphyton was grown on plastic membranes immersed in indoor aquaria contaminated with metals at realistic contamination levels (0.3, 3 µg/l for Cd, 5, 50 µg/l for Ni, 20, 200 µg/l for Zn). After 3 weeks of exposure, biofilms' parameters (dry-weight, chlorophyll a concentration, heterotrophic activity) were analyzed and tolerance acquisition of the heterotrophic communities was assessed using the toxicity test. Modifications of bacterial and eukaryotic community structure were assessed with Automated Ribosomal Intergenic Spacer Analysis (ARISA). Effects of metal exposure were observed on biofilms parameters in the Cd and Zn experiments. Tolerance levels increased for both Cd-exposed biofilms, and for the high metal treatment biofilms in the Ni and Zn experiments. Analysis of the ARISA profiles showed that metal exposure affected the structure of both bacterial and eukaryotic communities. Moreover, Cd tolerance of the Zn-exposed heterotrophic communities was evaluated, which showed that the Zn-tolerant community (high metal treatment in the Zn experiment) also became tolerant to Cd (co-tolerance). The study shows that tolerance acquisition can be detected after exposure to environmental metal concentrations using ß-glucosidase activity as an endpoint in short-term toxicity tests.
File Format	HTM / HTML
ISSN	09639292
Issue Number	4
Volume Number	20
e-ISSN	15733017
Journal	Ecotoxicology
Language	English
Publisher	Springer
Publisher Date	2011-06-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ecology Discipline Environmental Health Discipline Toxicology Adaptation, Physiological Metals Toxicity Water Microbiology Water Pollutants, Chemical Bacteria Drug Effects Growth & Development Biofilms Cadmium Chlorophyll Metabolism Cities Ecosystem Environmental Monitoring Eukaryota Nickel Zinc Beta-glucosidase Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Medicine Toxicology Management, Monitoring, Policy and Law

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Low exposure levels of urban metals induce heterotrophic community tolerance: a microcosm validation.

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