Bacterial and archaeal 16S rDNA and 16S rRNA dynamics during an acetate crisis in an anaerobic digestor ecosystem.
The dynamics of bacterial and archaeal populations of a laboratory-scale anaerobic digestor were investigated during a crisis period of the process reflected by an accumulation of acetate. A culture-independent approach based on single strand conformation polymorphism (SSCP) analysis of total 16S rDNA and 16S rRNA amplification products was used. A spirochete and a Synergistes sp. showed high and changing activity levels during the study. A Clostridium sp. showed a transient increase in presence and activity concomitant with the highest acetate concentrations. A major shift in the most active archaeal populations from hydrogenotrophic to acetoclastic methanogens preceded the recovery of the reactor.
Laboratoire de Biotechnologie de l'Environnement, Institut National de la Recherche Agronomique, Avenue des Etangs, 11100, Narbonne, France
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C
Delbès
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R
Moletta
J -J.
J
Godon