Data/hora: 01/06/2024 01:06:04

Provedor de dados: | 5
País: | France
Título: | Diffuse urban pollution increases metal tolerance of natural heterotrophic biofilms
Autores: | Fechner, Lise C.; Gourlay-france, Catherine; Bourgeault, Adeline; Tusseau-vuillemin, Marie-helene.
Data: | 2012-03
Ano: | 2012
Palavras-chave: | Metal tolerance; Beta-glucosidase; Freshwater biofilm; ARISA; Environmental quality standards; PICT; Heterotrophic communities.
Resumo: | 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 physical characteristics and not solely metal exposure. We conclude that community tolerance is a sensitive biological response to urban pressure and that mixtures of contaminants at levels lower than quality standards might have a significant impact on periphytic communities. (C) 2011 Elsevier Ltd. All rights reserved.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00073/18430/16055.pdf

DOI:10.1016/j.envpol.2011.11.033

Editor: | Elsevier Sci Ltd
Relação: | http://archimer.ifremer.fr/doc/00073/18430/
Formato: | application/pdf
Fonte: | Environmental Pollution (0269-7491) (Elsevier Sci Ltd), 2012-03 , Vol. 162 , P. 311-318
Fonte: | 2011 Elsevier Ltd. All rights reserved.