000135910 001__ 135910
000135910 005__ 20180913055202.0
000135910 037__ $$aPOST_TALK
000135910 269__ $$a2009
000135910 260__ $$c2009
000135910 336__ $$aPosters
000135910 520__ $$aNumerous industries and facilities have been using chlorinated ethenes (CEs) as non-flammable solvents since the beginning of the 20th century. These compounds are known to persist in the environment, exerting adverse effects. They have been considered for a long time as totally resistant to any form of microbial degradation. Advances in this field since the 1980’s showed that several bacteria can couple the reductive dechlorination of CEs to energy conservation in a process called dehalorespiration. The formation and composition of the microbial habitat, as well as the structure of the bacterial communities (in terms of cell density and species composition), are thought to be related directly to the dehalorespiration activity and to have an influence on the dehalorespiring guild diversity. The bacterial communities present in 104 water samples, from nine CE-contaminated Quaternary European aquifers, were analyzed using a standardized T-RFLP analysis. Strong relationships have been observed between the structure of the communities and both geological and environmental data sets, showing an apparent perfect adequacy between the bacterial cells and their specific habitat. In general, each aquifer hosted a specific bacterial community, whose variation was lower than the variation measured among all aquifers. No clear geographical pattern could be found among all aquifers, although temperature was an important variable that contributed apparently to the structuring of the communities. Surprisingly, statistical analysis showed that CEs did not play an important role in the structuring of the communities, even though a partial or complete reductive dehalogenation process could be observed in all aquifers. T-RFs corresponding putatively to already known guild members could be detected in almost all water samples, but they contributed marginally to the community profiles. Furthermore, these T-RFs showed a remarkably low fidelity index and were consequently never linked specifically to any of the observed aquifers.
000135910 6531_ $$abiogeography
000135910 6531_ $$aaquifer
000135910 6531_ $$abioremediation
000135910 6531_ $$achloroethene
000135910 6531_ $$abacterial communities
000135910 700__ $$aRossi, Pierre
000135910 700__ $$0243053$$aShani, Noam$$g181822
000135910 700__ $$aGillet, François
000135910 700__ $$0240405$$aHolliger, Christof$$g121849
000135910 7112_ $$a68th Annual Assembly of SSM$$cUNIL, Lausanne$$dJune 04-05, 2009
000135910 909C0 $$0252125$$pLBE$$xU10268
000135910 909CO $$ooai:infoscience.tind.io:135910$$pposter$$pENAC
000135910 937__ $$aLBE-POSTER-2009-003
000135910 973__ $$aEPFL$$sPUBLISHED
000135910 980__ $$aPOSTER