Consulta: subjectFacets:"PICT"
Registros recuperados: 4
Data/hora: 13/06/2024 05:17:03

Diffuse urban pollution increases metal tolerance of natural heterotrophic biofilms
Provedor de dados: 5
Autores: Fechner, Lise C.; Gourlay-france, Catherine; Bourgeault, Adeline; Tusseau-vuillemin, Marie-helene.
This study is a first attempt to investigate the impact of urban contamination on metal tolerance of heterotrophic river biofilms using a short-term test based on beta-glucosidase activity. Tolerance levels to Cu, Cd, Zn, Ni and Pb were evaluated for biofilms collected at three sites along an urban gradient in the Seine river (France). Metallic pollution increased along the river, but concentrations remained low compared to environmental quality standards. Biofilm metal tolerance increased downstream from the urban area. Multivariate analysis confirmed the correlation between tolerance and contamination and between multi-metallic and physico-chemical gradients. Therefore, tolerance levels have to be interpreted in relation to the whole chemical and...
Tipo: Text
Palavras-chave: Metal tolerance; Beta-glucosidase; Freshwater biofilm; ARISA; Environmental quality standards; PICT; Heterotrophic communities.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00073/18430/16055.pdf

TOPHYPAC. Tolérance des communautés phytoplanctoniques aux phytosanitaires dans le panache de la Charente. Programme Évaluation et réduction des risques liés à l’utilisation des Pesticides
Provedor de dados: 5
Autores: Stachowski-haberkorn, Sabine; Guesdon, Stephane; Bechemin, Christian; Chiffoleau, Jean-francois; Brach-papa, Christophe; Soudant, Philippe; Beker, Beatriz; Jadas-hécart, Alain.
TOPHYPAC is a field study that was conducted in the Charente river estuary (Marennes-Oléron bay). The main goal was to assess the possible impact of chemical contamination with copper and pesticides on phytoplankton communities. Physical, chemical (nutrients, metals and pesticides) and biological (phytoplankton community) parameters were monitored in the field during three years, from 2011 to 2014. In 2012 and 2013, field sampling was coupled with experimental exposure of phytoplankton communities to copper and to an herbicide cocktail, after transportation to the lab: the effects were assessed using photosynthesis endpoint and cellular densities. TOPHYPAC allowed to set the framework of Charente estuary contamination with pesticides: herbicides glyphosate...
Tipo: Text
Palavras-chave: Continuum eau douce/eau côtière; Pesticides; Métaux; Communautés phytoplanctoniques; Efficacité de photosynthèse; PICT; Tolérance; Cytométrie en flux; Toxicité chronique; Freshwater/coastal water continuum; Pesticides; Metals; Phytoplankton communities; Photosynthesis efficiency; PICT; Tolerance; Flow cytometry; Chronic toxicity.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00300/41115/40289.pdf

Adaptation of copper community tolerance levels after biofilm transplantation in an urban river
Provedor de dados: 5
Autores: 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

Linking community tolerance and structure with low metallic contamination: a field study on 13 biofilms sampled across the Seine river basin
Provedor de dados: 5
Autores: 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