Figure 5. Metabolism of 2-CP and its effects on the activities of syntrophic populations in a 2-CP–amended sediment mesocosm. (A) 2-CP transformation and transient accumulation of benzoate in a sediment mesocosm (phenol and 3-CB also accumulated transiently, but are not shown). (B) H₂ levels in the 2-CP–amended mesocosm and associated no-substrate control.(C) CH₄ levels in the 2-CP–amended mesocosm and associated no-substrate control. (D) Relative abundance of Syntrophus-like and archaeal SSU rRNA in the 2-CP–amended reactor. (E) Relative abundance of Syntrophus-like and archaeal SSU rRNA in the no-substrate control. 2-CP concentrations in the sterile control are not shown. Adapted from Becker et al. (2001).