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| Fechner, Lise C.; Versace, Francois; Gourlay-france, Catherine; Tusseau-vuillemin, Marie-helene. |
| The Water Framework Directive requires the development of biological tools which can act as early-warning indicators of a sudden increase (accidental pollution) or decrease (recovery due to prevention) of the chemical status of aquatic systems. River biofilms, which respond quickly to modifications of environmental parameters and also play a key part in the functioning of aquatic ecosystems, are therefore good candidates to monitor an increase or a decrease of water pollution. In the present study, we investigated the biological response of biofilms transplanted either upstream (recovery) or downstream (deterioration of exposure levels) the urban area of Paris (France). Both modifications of Cu community tolerance levels and of global bacterial and... |
| Tipo: Text |
Palavras-chave: River; Biofilm; PICT; ARISA; Urban contamination; Transplantation. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00070/18129/16053.pdf |
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| Fechner, Lise C.; Gourlay-france, Catherine; Tusseau-vuillemin, Marie-helene. |
| It is difficult to assess the biological consequences of diffuse water contamination by micropollutants which are present in rivers at low, even sublethal levels. River biofilms, which respond quickly to changes of environmental parameters, are good candidates to acquire knowledge on the response of aquatic organisms to diffuse chemical contamination in the field. The study was designed as an attempt to link biofilm metal tolerance and metallic contamination in a field survey covering 13 different sampling sites in the Seine river basin (north of France) with low contamination levels. Cd and Zn tolerance of heterotrophic communities was assessed using a short-term toxicity test based on β-glucosidase activity. Metal tolerance levels varied between sites... |
| Tipo: Text |
Palavras-chave: River biofilm; Metal tolerance; Toxicity; ARISA; PICT; Community-level response. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00169/28072/26287.pdf |
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| Fechner, Lise C.; Gourlay-france, Catherine; Tusseau-vuillemin, Marie-helene. |
| 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 beta-glucosidase (heterotrophic) activity. Periphyton was grown on plastic membranes immersed in indoor aquaria contaminated with metals at realistic contamination levels (0.3, 3 mu g/l for Cd, 5, 50 mu g/l for Ni, 20, 200 mu g/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... |
| Tipo: Text |
Palavras-chave: Biofilms; Urban metal; Community tolerance; ARISA. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00036/14682/12028.pdf |
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