La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Dynamics of a benthic microbial community in a riverine environment subject to hydrological fluctuations (Mulargia River, Italy)
Auteurs :	Annamaria Zoppini, Auteur ; Stefano Amalfitano, Auteur ; Stefano Fazi, Auteur ; Alberto Puddu, Auteur
Type de document :	Article
Dans :	Hydrobiologia (657(1) DEC 2010)
Article en page(s) :	37-51
Résumé :	Temporary rivers are characterized by recurrent dry phases, and global warming will stress their hydrology by amplifying extreme events. Microbial degradation and transformation of organic matter (OM) in riverbed sediment are key processes with regard to carbon and nutrient fluxes. In this study, we describe structural and functional changes of benthic microbial communities in a riverine environment subject to hydrological fluctuation. Sampling was carried out in the outlet section of the Mulargia River (Sardinia, Italy) under various water regimes, including one flood event. Overall, sediments were characterized by low bacterial cell abundance (range 0.6-1.8 x 10(9) cell g(-1)) as a consequence of their low nutrient and OM concentrations. No major differences were found in the community composition. Alpha-Proteobacteria dominated during the whole year (range 21-30%) followed by Beta-Proteobacteria, Gamma-Proteobacteria, and Cytophaga-Flavobacteria which always contributed

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